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Colorado State Basin Outlook Report for June, 2012


	COLORADO Water Supply Outlook Report as of June 1, 2012

The 2012 water year is definitely one that will be remembered for 
quite some time. Coming on the heels of one of the wettest and 
snowiest years in recent memory it began with great expectations and 
with well above average precipitation in October and significant 
early season snow storms across the state. Unfortunately hopes were 
thwarted by a very dry December which left our first snow surveys of 
the year measuring a below average snowpack. From that point, with 
the exception of some decent snow accumulation in February, the 
weather managed to conjure up some painful memories of the 2002 
drought. In the end this season saw the lowest statewide snowpack 
accumulation since 2002 and in some basins, this year became the new 
minimum on record. This spring the entire state has experienced 
persistent warm and dry weather patterns contributing to dry soils 
and the early melt of an already anemic snowpack. The only part of 
the equation separating this year from conditions in 2002 is 
reservoir storage. Across the state storage volumes remain very close 
to average thanks to the abundant snowfall and runoff from the 2011 
winter.


	SNOWPACK

May ended up being another dry and warm month across Colorado. The 
continuation of this abnormally warm weather caused the snowpack to 
continue to melt out at a nearly uninterrupted pace. By June 1, the 
snowpack was nearly nonexistent in all of Colorado’s major basins 
with only 4 out of the 92 SNOTEL sites used in this report, measuring 
any snow. The statewide snowpack as of June 1 was a negligible 2 
percent of average, and 1 percent of last year’s report on this date. 
Basin by basin only the Colorado, South Platte, Arkansas and combined 
Yampa, White and North Platte basins had any snow remaining and only 
at the higher elevations in the basins. Most SNOTEL sites were 
completely melted out about a month earlier than normal. The warm 
weather this spring in combination with dry winds and dry soils 
really decimated what little snowpack we had received. These 
conditions also result in a fair amount of sublimation which will 
likely have an impact on streamflow volumes.


	PRECIPITATION

Precipitation at Colorado’s SNOTEL sites was well below average this 
May. Six out of the last seven months have recorded below average 
precipitation across the state. Statewide totals for May were just 42 
percent of average which dropped the water year to date precipitation 
to 71 percent of average and 59 percent of last year’s totals. The 
combined San Miguel, Dolores, Animas and San Juan basin received 
precipitation that was only 14 percent of average for the month and 
the Gunnison basin was also very dry at just 23 percent of average. 
The South Platte basin fared somewhat better with monthly totals at 
62 percent of average. Water year totals range from a high of 85 
percent of average in the Upper Rio Grande basin to 66 percent of 
average in the Colorado basin.


	RESERVOIR

Reservoir storage in the state is slightly below average. In an 
average year the state’s reservoirs store 3786 kilo acre feet (KAF) 
of water at this time of year. This year storage levels are at 3716 
KAF, which equates to 98 percent of average. Since May 1 storage 
volumes statewide have declined by 24 KAF. Typically storage volumes 
increase during May but water managers filled their reservoirs early 
due to low streamflow predictions and demand has likely increased 
with above normal temperatures.  As of June 1 the Arkansas and Upper 
Rio Grande reported the lowest storage volumes in the state at 78 and 
57 percent of average respectively. All other major basins in the 
state are reporting near or above average storage. The Gunnison River 
basin’s reservoirs are storing 823 KAF which is 103 percent of 
average. The Upper Colorado basin is storing 905 KAF which is 113 
percent of average. The South Platte basin is storing 930 KAF which 
is 95 percent of average. The combine San Miguel, Animas, Dolores and 
San Juan basins are storing 526 KAF which is 106 percent of average. 
And the Yampa basin is storing 34 KAF in Stagecoach reservoir which 
is 113 percent of average; Yamcolo reservoir was not included in this 
report due to a broken gauge.


	STREAMFLOW

Another dry month in May brought additional decreases to the 
streamflow forecasts across western Colorado. As a general rule, 
forecasts for the western basins range from about 25 to 50 percent of 
average. In the Upper Rio Grande, Arkansas, and South Platte basins 
seasonal predictions improved by a couple of percentage points for 
most forecasts due to higher than expected observed flows so far this 
spring. These basins can expect volumes of 20 to 60 percent of 
average. The lowest forecasts, as a percent of average, are in the 
headwaters of the Gunnison River, where the forecasted flow for the 
Tomichi Creek tributary is just 7 percent of average. The state's 
best outlook, while still quite dismal, is for the Upper Rio Grande 
basin as a whole. Streams in this basin are expected to run at 40 to 
60 percent of average from April to September.  In summary, across 
the state, early snowmelt has translated to earlier than normal peak 
flows, which will likely be followed by an earlier than normal return 
to base flows in mid-summer.


	GUNNISON RIVER BASIN as of June 1, 2012

As of June 1all thirteen SNOTEL sites in the Gunnison River basin 
were reporting 0 inches of SWE. In fact the basin’s snowpack had 
completely melted out by May 21, just over three weeks earlier than 
normal. The snowpack in this basin peaked on March 22 at just 69 
percent of the average peak which typically occurs on April 12. As a 
percent of average, May shaped up to be the driest month recorded so 
far this water year within the basin. Total precipitation recorded 
for the month of May was just 23 percent of average; this is the 
third consecutive month reporting well below average precipitation. 
Year to date precipitation dropped 5 percentage points from last 
month and was 70 percent of average as of June 1. 
Reservoir storage decreased by 3,000 acre feet during May but is 
still in good shape heading into the summer. Stored volumes are at103 
percent of average and 109 percent of what was stored this time last 
year. Warm, dry conditions this spring pushed the snowpack into the 
streams much earlier than normal. Many streams in the Gunnison River 
basin saw observed flows in late March and early April that were 
above average. This early season runoff means less water available 
during the typical peak runoff season in June. June to July 
streamflow volumes are forecast to be just 6 percent of average at 
Tomichi Creek in the headwaters of the Gunnison River and 30 percent 
of average for the Inflow to Ridgway Reservoir on the Uncompahgre 
River above Colona, CO.

================================================================================
                              GUNNISON RIVER BASIN
                      Streamflow Forecasts - June 1, 2012
================================================================================
            |  <=== Drier ===  Future  Conditions  === Wetter ===>  |
            |                                                       |
Forecast Pt | ===============  Chance of Exceeding * ============== |
   Forecast |  90%       70%   |       50%       |  30%       10%   | 30 Yr Avg
   Period   |(1000AF)  (1000AF)|(1000AF) (% AVG.)|(1000AF)  (1000AF)| (1000AF)
================================================================================
Taylor Park Reservoir Inflow (2)
   APR-JUL       33       36        39       38        42       47       103  
   JUN-JUL      6.7     10.2      13.0       19      16.1       21        68  

Slate R nr Crested Butte
   APR-JUL       29       31        33       37        35       38        89  
   JUN-JUL      5.0      7.2       9.0       20      11.0     14.2        46  

East R at Almont
   APR-JUL       51       55        58       30        61       67       192  
   JUN-JUL     11.0     15.0      18.0       15        21       27       118  

Gunnison R near Gunnison (2)
   APR-JUL       83       90        95       24       101      111       390  
   JUN-JUL     16.0       23        28       12        34       44       240  

Tomichi Ck at Sargents
   APR-JUL      5.2      5.8       6.3       20       7.0      8.2        32  
   JUN-JUL      0.9      1.5       2.0       13       2.7      3.9      15.7  

Cochetopa Ck bl Rock Ck nr Parlin
   APR-JUL      2.5      2.8       3.1       18       3.5      4.3      17.3  
   JUN-JUL      0.2      0.5       0.8        9       1.1      2.0       8.0  

Tomichi Ck at Gunnison
   APR-JUL      4.2      5.1       6.0        7       7.1      9.3        81  
   JUN-JUL      0.8      1.6       2.5        6       3.6      5.8        43  

Lake Fk at Gateview
   APR-JUL       53       57        60       48        64       69       126  
   JUN-JUL     16.2       21        24       27        28       33        88  

Blue Mesa Reservoir Inflow (2)
   APR-JUL      174      187       196       27       205      220       720  
   JUN-JUL       43       56        65       15        75       91       425  

Paonia Reservoir Inflow (2)
   MAR-JUN       28       29        30       30        31       33       100  
   JUN-VOL      0.2      1.0       2.0        7       3.3      5.7        27  
   APR-JUL       20       21        23       23        25       28       102  
   JUN-JUL      0.3      1.6       3.0        9       4.9      8.4        33  

NF Gunnison R nr Somerset (2)
   APR-JUL       80       85        89       29        93      100       305  
   JUN-JUL     13.0     18.0        22       17        26       33       130  

Surface Ck at Cedaredge
   APR-JUL      6.4      6.6       6.9       40       7.2      7.7      17.1  
   JUN-JUL      0.5      0.8       1.0       12       1.3      1.8       8.3  

Ridgway Reservoir Inflow (2)
   APR-JUL       39       43        46       45        49       54       102  
   JUN-JUL     14.4     18.2        21       30        24       29        69  

Uncompahgre R at Colona (2)
   APR-JUL       33       38        42       30        47       55       139  
   JUN-JUL      6.2     11.0      15.0       17      19.7       28        88  

Gunnison R nr Grand Junction (2)
   APR-JUL      335      360       380       24       405      440      1560  
   JUN-JUL       30       53        73        9        96      134       785  

================================================================================
   * 90%, 70%, 50%, 30%, and 10% chances of exceeding are the probabilities that
     the actual volume will exceed the volumes in the table.

   The average is computed for the 1971-2000 base period.

   (1) - The values listed under the 10% and 90% Chance of Exceeding are
         actually 5% and 95% exceedance levels.
   (2) - The value is natural volume - actual volume may be affected by upstream
         water management.
   (3) - Median value used in place of average.
================================================================================
                              GUNNISON RIVER BASIN
                   Reservoir Storage (1000AF) End of May
================================================================================
                                Usable     ********** Usable Storage *********
Reservoir                      Capacity    This Year    Last Year      Average
================================================================================
BLUE MESA                        830.0        526.3        493.0        517.1   
CRAWFORD                          14.0          9.2         14.0         12.6   
FRUITGROWERS                       3.6          2.8          3.4          4.0   
FRUITLAND                          9.2          1.6          7.9          6.3   
MORROW POINT                     121.0        112.3        114.0        113.8   
PAONIA                            15.4         15.3          2.6         15.7   
RIDGWAY                           83.0         75.1         57.5         61.2   
TAYLOR PARK                      106.0         80.5         61.0         71.8   
================================================================================

================================================================================
                              GUNNISON RIVER BASIN
                   Watershed Snowpack Analysis - June 1, 2012
================================================================================
                                 Number of           This Year as Percent of
Watershed                        Data Sites          Last Year       Average
================================================================================
UPPER GUNNISON BASIN                  9                  0                  0
SURFACE CREEK BASIN                   2                  0                  0
UNCOMPAHGRE BASIN                     3                  0                  0
TOTAL GUNNISON RIVER BASIN           12                  0                  0
================================================================================


	UPPER COLORADO RIVER BASIN as of June 1, 2012

On June 1 the snowpack in the Colorado River basin was just 1 percent 
of average, with only 2 out of the 28 SNOTEL sites in the basin 
reporting measurable snow. The only sub basins reporting snow were 
the Blue River basin at 3 percent of average and the Upper Colorado 
at 1 percent of average. The most recent data reveals that snowpack 
measurements have been zero since June 2 at all SNOTEL sites in the 
basin. This is 19 days earlier than the normal melt out date of June 
21.  May was another well below average month for precipitation, with 
the basin reporting totals at just 44 percent of average. Cumulative 
precipitation for the water year has fallen to just 66 percent of 
average and 49 percent of the total recorded last year on June 1.
Reservoir storage in the basin remains above average. Storage volumes 
at the end of May were 113 percent of average which equates to 
905,000 acre feet stored. Last month the reservoirs in this basin 
were storing 867,000 acre feet of water. Water supply forecasts for 
April to July have dropped a few percentage points from those issued 
last month; they are now, on average, 41 percent of average. With the 
snowpack already depleted forecasts for the remainder of the season 
(June - July) are well below average. They range from 19 percent of 
average for both Willow Creek Reservoir Inflow and Muddy Creek below 
Wolford Mountain Reservoir to 33percent of average for the Inflow to 
Green Mountain Reservoir.

================================================================================
                              UPPER COLORADO RIVER BASIN
                      Streamflow Forecasts - June 1, 2012
================================================================================
            |  <=== Drier ===  Future  Conditions  === Wetter ===>  |
            |                                                       |
Forecast Pt | ===============  Chance of Exceeding * ============== |
   Forecast |  90%       70%   |       50%       |  30%       10%   | 30 Yr Avg
   Period   |(1000AF)  (1000AF)|(1000AF) (% AVG.)|(1000AF)  (1000AF)| (1000AF)
================================================================================
Lake Granby Inflow (2)
   APR-JUL       96      104       110       49       117      127       225  
   JUN-JUL       31       39        45       29        52       62       156  

Willow Ck Reservoir Inflow (2)
   APR-JUL     18.0     19.4        21       41        22       24        51  
   JUN-JUL      2.0      3.4       4.5       19       5.8      8.0        24  

Williams Fk Reservoir Inflow (2)
   APR-JUL       36       40        42       44        45       50        95  
   JUN-JUL     15.3     19.2        22       32        25       30        68  

Dillon Reservoir Inflow (2)
   APR-JUL       59       65        70       42        75       82       167  
   JUN-JUL       24       30        35       29        40       47       119  

Green Mountain Reservoir Inflow (2)
   APR-JUL      104      116       125       45       134      149       280  
   JUN-JUL       44       56        65       33        74       89       199  

Muddy Ck bl Wolford Mtn Resv (2)
   APR-JUL     17.0     18.7        21       35        23       28        60  
   JUN-JUL      0.4      2.1       4.0       19       6.5     11.2        21  

Eagle R bl Gypsum (2)
   APR-JUL      115      128       137       41       147      164       335  
   JUN-JUL       33       46        55       24        65       82       225  

Colorado R nr Dotsero (2)
   APR-JUL      475      520       555       39       595      655      1440  
   JUN-JUL      143      189       225       25       265      325       905  

Ruedi Reservoir Inflow (2)
   APR-JUL       43       47        57       40        68       84       141  
   JUN-JUL      9.2     13.0        23       24        34       50        96  

Roaring Fk at Glenwood Springs (2)
   APR-JUL      205      245       275       39       305      345       710  
   JUN-JUL       62      102       130       27       158      198       490  

Colorado R nr Cameo (2)
   APR-JUL      800      875       930       38       990     1080      2420  
   JUN-JUL      250      325       380       25       440      535      1530  

================================================================================
   * 90%, 70%, 50%, 30%, and 10% chances of exceeding are the probabilities that
     the actual volume will exceed the volumes in the table.

   The average is computed for the 1971-2000 base period.

   (1) - The values listed under the 10% and 90% Chance of Exceeding are
         actually 5% and 95% exceedance levels.
   (2) - The value is natural volume - actual volume may be affected by upstream
         water management.
   (3) - Median value used in place of average.
================================================================================
                              UPPER COLORADO RIVER BASIN
                   Reservoir Storage (1000AF) End of May
================================================================================
                                Usable     ********** Usable Storage *********
Reservoir                      Capacity    This Year    Last Year      Average
================================================================================
DILLON                           254.0        243.1        184.9        229.0   
LAKE GRANBY                      465.6        351.5        282.2        302.9   
GREEN MOUNTAIN                   146.8         95.0         54.8         76.1   
HOMESTAKE                         43.0          0.3         14.7         20.3   
RUEDI                            102.0         85.1         63.2         74.2   
VEGA                              32.9         30.6         30.3         29.2   
WILLIAMS FORK                     97.0         91.9         79.6         63.6   
WILLOW CREEK                       9.1          7.1          1.7          7.4   
================================================================================

================================================================================
                              UPPER COLORADO RIVER BASIN
                   Watershed Snowpack Analysis - June 1, 2012
================================================================================
                                 Number of           This Year as Percent of
Watershed                        Data Sites          Last Year       Average
================================================================================
BLUE RIVER BASIN                      5                  1                  3
UPPER COLORADO RIVER BASIN           19                  0                  1
MUDDY CREEK BASIN                     2                  0                  0
PLATEAU CREEK BASIN                   2                  0                  0
ROARING FORK BASIN                    7                  0                  0
WILLIAMS FORK BASIN                   2                  0                  0
WILLOW CREEK BASIN                    2                  0                  0
TOTAL COLORADO RIVER BASIN           28                  0                  1
================================================================================


	SOUTH PLATTE RIVER BASIN as of June 1, 2012

As of June 1 the South Platte basin's snowpack was just 3 percent of 
average with only 1 of the 17 SNOTEL sites in the basin reporting any 
snow. Snow accumulation in this basin peaked in early March with a 
snowpack at 89 percent of average as of March 1. Subsequent months 
have exemplified the term “downward trend” with April 1 surveys at 55 
percent of average and May 1reports at 25 percent of average. 
Precipitation during the month of May was 62 percent of average, and 
47 percent of the precipitation recorded in May of 2011. Year to date 
precipitation was at 72 percent of average on June 1.
End of May reservoir storage in the basin was 95 percent of average; 
storage volumes are down 9,000 acre feet from those reported at the 
end of April. Reservoir storage percentages are expected to drop in 
the coming months due to increased water use and the effects of low 
snowpack and early runoff. The current streamflow forecasts for the 
South Platte basin are slightly higher than those issued last month 
due to higher than expected observed flows in April and May. 
Forecasts for the remainder of the forecast period (June to July) are 
expected to range from 20 percent of average for Bear Creek above 
Evergreen, CO to 52 percent of average for South Boulder Creek near 
Eldorado Springs, CO. Elsewhere in the basin Clear Creek at Golden is 
expected to be at 31 percent of average from June to July and the 
Cache la Poudre at Canyon Mouth gage is forecast to flow at 39 
percent of average from June to July.

================================================================================
                              SOUTH PLATTE RIVER BASIN
                      Streamflow Forecasts - June 1, 2012
================================================================================
            |  <=== Drier ===  Future  Conditions  === Wetter ===>  |
            |                                                       |
Forecast Pt | ===============  Chance of Exceeding * ============== |
   Forecast |  90%       70%   |       50%       |  30%       10%   | 30 Yr Avg
   Period   |(1000AF)  (1000AF)|(1000AF) (% AVG.)|(1000AF)  (1000AF)| (1000AF)
================================================================================
Antero Reservoir Inflow (2)
   APR-JUL      3.2      4.1       4.9       29       5.8      7.5      16.8  
   APR-SEP      3.4      4.7       5.8       26       7.3      9.8        22  
   JUN-JUL      0.9      1.8       2.6       23       3.5      5.2      11.5  
   JUN-SEP      1.1      2.4       3.5       23       5.0      7.5      15.4  

Spinney Mountain Res Inflow (2)
   APR-JUL     12.1     15.7      18.9       34        23       29        56  
   APR-SEP     13.1     18.3        23       33        28       38        69  
   JUN-JUL      4.2      7.8      11.0       28      15.1       21        39  
   JUN-SEP      5.2     10.4      15.1       29        20       30        52  

Elevenmile Canyon Res Inflow (2)
   APR-JUL     12.0     15.6      18.8       32        22       29        58  
   APR-SEP     13.2     18.8        24       33        30       40        72  
   JUN-JUL      4.2      7.8      11.0       27      14.2       21        41  
   JUN-SEP      5.4     11.0      16.2       30        22       32        54  

Cheesman Lake Inflow (2)
   APR-JUL       22       29        35       31        42       54       114  
   APR-SEP       23       34        43       31        54       74       140  
   JUN-JUL      7.3     14.3        20       28        27       39        72  
   JUN-SEP      8.3     19.3        28       28        39       59        99  

South Platte R at South Platte (2)
   APR-JUL       39       51        62       30        74       95       205  
   APR-SEP       43       61        77       30        96      128       255  
   JUN-JUL     17.0       29        40       32        52       73       124  
   JUN-SEP       21       39        55       32        74      106       172  

Bear Ck ab Evergreen
   APR-JUL      2.7      3.4       4.2       22       4.9      6.6      19.3  
   APR-SEP      3.6      4.9       6.2       25       7.6     10.0        25  
   JUN-JUL      0.5      1.3       2.1       20       2.8      4.4      10.4  
   JUN-SEP      1.4      2.8       4.0       25       5.4      7.8      16.0  

Bear Ck at Morrison
   APR-JUL      2.9      4.0       5.2       21       6.7      9.6        25  
   APR-SEP      3.5      5.4       7.2       23       9.4     13.5        31  
   JUN-JUL      0.5      1.6       2.8       24       4.3      7.2      11.9  
   JUN-SEP      1.1      3.0       4.8       27       7.0     11.1      17.7  

Clear Ck at Golden
   APR-JUL       34       39        44       40        49       57       110  
   APR-SEP       39       47        54       40        61       73       134  
   JUN-JUL     14.9     19.9        25       31        30       38        82  
   JUN-SEP       20       28        35       33        42       54       106  

St. Vrain Ck at Lyons (2)
   APR-JUL       40       45        49       52        53       59        94  
   APR-SEP       47       54        59       54        64       73       109  
   JUN-JUL       21       26        30       48        34       40        62  
   JUN-SEP       28       35        40       51        45       54        78  

Boulder Ck nr Orodell (2)
   APR-JUL       21       23        25       48        27       30        52  
   APR-SEP       24       26        29       48        31       35        60  
   JUN-JUL      9.9     11.9      13.9       42      15.9     18.9        33  
   JUN-SEP     12.9     14.9      17.9       45      19.9       24        40  

S Boulder Ck nr Eldorado Springs (2)
   JUN-JUL      5.9     10.0      13.4       52      17.3       24        26  
   JUN-SEP      7.0     12.0      16.2       54        21       29        30  

Big Thompson R at Canyon Mouth (2)
   APR-JUL       31       36        40       40        44       51        99  
   APR-SEP       37       44        49       41        55       64       119  
   JUN-JUL     16.4       21        25       36        29       36        70  
   JUN-SEP       22       29        34       39        40       49        88  

Cache La Poudre at Canyon Mouth (2)
   APR-JUL       96      111       123       50       136      157       245  
   APR-SEP      104      122       136       50       151      177       275  
   JUN-JUL       35       50        62       39        75       96       160  
   JUN-SEP       43       61        75       40        90      116       186  

================================================================================
   * 90%, 70%, 50%, 30%, and 10% chances of exceeding are the probabilities that
     the actual volume will exceed the volumes in the table.

   The average is computed for the 1971-2000 base period.

   (1) - The values listed under the 10% and 90% Chance of Exceeding are
         actually 5% and 95% exceedance levels.
   (2) - The value is natural volume - actual volume may be affected by upstream
         water management.
   (3) - Median value used in place of average.
================================================================================
                              SOUTH PLATTE RIVER BASIN
                   Reservoir Storage (1000AF) End of May
================================================================================
                                Usable     ********** Usable Storage *********
Reservoir                      Capacity    This Year    Last Year      Average
================================================================================
ANTERO                            19.9         15.8         17.5         16.0   
BARR LAKE                         30.1         23.6         28.4         27.7   
BLACK HOLLOW                       6.5          4.6          4.5          4.4   
BOYD LAKE                         48.4         36.9         42.2         40.0   
BUTTON ROCK/RALPH PRICE           16.2         13.7         11.8         14.7   
CACHE LA POUDRE                   10.1         10.0          9.6          9.1   
CARTER                           108.9         83.2        103.9        100.2   
CHAMBERS LAKE                      8.8          7.3          3.4          5.8   
CHEESMAN                          79.0         71.4         66.8         66.2   
COBB LAKE                         22.3         17.9         20.1         14.7   
ELEVEN MILE                       98.0         99.9        100.0         97.1   
EMPIRE                            36.5         27.9         36.5         30.7   
FOSSIL CREEK                      11.1          9.7         10.1          8.0   
GROSS                             41.8         34.8         16.1         28.8   
HALLIGAN                           6.4          5.2          6.4          6.0   
HORSECREEK                        14.7         10.4         11.6         14.1   
HORSETOOTH                       149.7        126.3        109.2        123.2   
JACKSON                           26.1         25.0         26.1         30.6   
JULESBURG                         20.5         19.7         19.6         21.5   
LAKE LOVELAND                     10.3          6.8          9.1         11.0   
LONE TREE                          8.7          7.8          8.4          8.6   
MARIANO                            5.4          3.5          5.1          5.4   
MARSHALL                          10.0          9.5          6.5          8.2   
MARSTON                           13.0          8.2         10.2         15.3   
MILTON                            23.5         18.3         22.7         19.3   
POINT OF ROCKS                    70.6         57.0         68.9         66.3   
PREWITT                           28.2         20.9         24.6         26.7   
RIVERSIDE                         55.8         42.6         55.7         56.0   
SPINNEY MOUNTAIN                  49.0         43.4         35.1         35.6   
STANDLEY                          42.0         37.7         34.3         36.8   
TERRY LAKE                         8.0          7.9          5.6          7.0   
UNION                             13.0         11.3         12.6         12.2   
WINDSOR                           15.2         11.6         14.6         15.0   
================================================================================

================================================================================
                              SOUTH PLATTE RIVER BASIN
                   Watershed Snowpack Analysis - June 1, 2012
================================================================================
                                 Number of           This Year as Percent of
Watershed                        Data Sites          Last Year       Average
================================================================================
BIG THOMPSON BASIN                    3                  0                  0
BOULDER CREEK BASIN                   3                  9                 27
CACHE LA POUDRE BASIN                 2                  0                  0
CLEAR CREEK BASIN                     2                  0                  0
SAINT VRAIN BASIN                     1                  0                  0
UPPER SOUTH PLATTE BASIN              6                  0                  0
TOTAL SOUTH PLATTE BASIN             17                  1                  3
================================================================================


	YAMPA, WHITE, AND NORTH PLATTE RIVER BASINS as of June 1, 2012

Although only 3 out of the 24 SNOTEL locations in these basins had 
snow remaining at them on June 1, they did have the most measurable 
snow remaining in the state. Measurements in the North Platte basin 
were 8 percent of average, while the combined Yampa and White basins 
surveys reported the snowpack at just 6 percent of average. For the 
combined basins the snowpack peaked at just 66 percent of the average 
peak accumulation total on March 6. This is a significant 41 days 
ahead of the average peak date of April 17. What little snow remains 
will likely disappear in the next week, around 20 days ahead of the 
normal melt out date.
Precipitation in these basins was only 39 percent of average during 
May marking the third consecutive month the basins have reported 
below average precipitation. The water year total is now just 67 
percent of average and 47 percent of the water year total at this 
time last year. Storage in Stagecoach reservoir remains in good 
condition this month at 113 percent of average which is a decline 
from last month's report of 122 percent of average.  Another dry and 
warm month in these basins has nudged seasonal streamflow forecasts 
even lower this month. April to July forecasts issued on June 1 
decreased 1 to 9 percentage points from those issued last month. 
Forecasts for June to July now range from 9 percent of average for 
the Little Snake River near Dixon to 33 percent of average for the 
Laramie River near Woods Landing.

================================================================================
                              YAMPA, WHITE, AND NORTH PLATTE RIVER BASINS
                      Streamflow Forecasts - June 1, 2012
================================================================================
            |  <=== Drier ===  Future  Conditions  === Wetter ===>  |
            |                                                       |
Forecast Pt | ===============  Chance of Exceeding * ============== |
   Forecast |  90%       70%   |       50%       |  30%       10%   | 30 Yr Avg
   Period   |(1000AF)  (1000AF)|(1000AF) (% AVG.)|(1000AF)  (1000AF)| (1000AF)
================================================================================
North Platte R nr Northgate
   JUN-JUL      6.0     11.0        29       22        47       73       133  
   JUN-SEP     10.0     14.0        36       23        58       90       159  

Laramie R nr Woods
   JUN-JUL      3.1     16.1        25       33        34       47        77  
   JUN-SEP      4.9     19.8        30       34        40       55        89  

Yampa R ab Stagecoach Reservoir (2)
   APR-JUL      5.1      5.4       5.7       24       6.1      6.8        24  
   JUN-JUL      0.4      0.7       1.0       10       1.4      2.1      10.1  

Yampa R at Steamboat Springs (2)
   APR-JUL      105      112       117       42       123      134       280  
   JUN-JUL     10.0     16.0        22       16        28       39       138  

Elk R nr Milner
   APR-JUL      152      162       170       52       179      194       325  
   JUN-JUL     17.0       27        35       22        44       59       158  

Elkhead Ck ab Long Gulch nr Hayden
   APR-JUL       20       20        21       30        22       24        71  
   JUN-JUL      0.0      0.2       1.0       10       2.4      4.0       9.8  

Yampa R nr Maybell (2)
   APR-JUL      325      350       370       37       390      430       990  
   JUN-JUL       32       55        75       17        97      136       440  

Little Snake R nr Slater (2)
   APR-JUL       67       70        73       46        77       83       159  
   JUN-JUL      2.7      6.0       9.0       13      12.6     18.9        71  

Little Snake R nr Savery (2)
   APR-JUL       98      103       109       33       117      132       330  
   JUN-JUL      1.0      6.0      12.0        9        20       35       133  

Little Snake R nr Lily (2)
   APR-JUL      105      111       117       32       126      142       365  
   JUN-JUL      2.0      8.0      14.0       10        23       39       148  

White R nr Meeker
   APR-JUL       97      106       114       39       123      137       290  
   JUN-JUL     15.0       24        32       20        41       55       160  

================================================================================
   * 90%, 70%, 50%, 30%, and 10% chances of exceeding are the probabilities that
     the actual volume will exceed the volumes in the table.

   The average is computed for the 1971-2000 base period.

   (1) - The values listed under the 10% and 90% Chance of Exceeding are
         actually 5% and 95% exceedance levels.
   (2) - The value is natural volume - actual volume may be affected by upstream
         water management.
   (3) - Median value used in place of average.
================================================================================
                              YAMPA, WHITE, AND NORTH PLATTE RIVER BASINS
                   Reservoir Storage (1000AF) End of May
================================================================================
                                Usable     ********** Usable Storage *********
Reservoir                      Capacity    This Year    Last Year      Average
================================================================================
STAGECOACH                        36.4         33.9         37.2         29.9   
YAMCOLO                                         NO REPORT            
================================================================================

================================================================================
                              YAMPA, WHITE, AND NORTH PLATTE RIVER BASINS
                   Watershed Snowpack Analysis - June 1, 2012
================================================================================
                                 Number of           This Year as Percent of
Watershed                        Data Sites          Last Year       Average
================================================================================
LARAMIE RIVER BASIN                   2                  0                  0
NORTH PLATTE RIVER BASIN              7                  3                  9
TOTAL NORTH PLATTE BASIN              9                  3                  8
ELK RIVER BASIN                       2                  0                  0
YAMPA RIVER BASIN                     9                  3                  8
WHITE RIVER BASIN                     4                  0                  1
TOTAL YAMPA AND WHITE RIVER          12                  2                  6
LITTLE SNAKE RIVER BASIN              6                  4                 11
TOTAL YAMPA, WHITE AND NORTH         24                  2                  6
================================================================================


	ARKANSAS RIVER BASIN as of June 1, 2012

The Arkansas River basin reported a snowpack at just 4 percent of its 
average on June 1. Of the 6 SNOTEL sites in the basin only the 
Fremont Pass site had any measurable snow on June 1. Snow 
accumulation peaked in the Arkansas basin on March 13 at 75 percent 
of the average peak amount. This is an entire month ahead of the 
average peak date which occurs on April 13. Warm, dry conditions in 
the basin accelerated snowmelt causing the snow to disappear about 
two weeks ahead of the typical melt out date. Precipitation during 
the month of May was only 54 percent of average making it the seventh 
consecutive month with below average precipitation in the basin. 
Water year to date precipitation has dropped to 77 percent of average 
and 87 percent of what was reported last year on June 1. 
Combined reservoir storage in the 13 reservoirs in the basin was at 
78 percent of average at the end of May. The reservoirs in the upper 
portion of the basin were storing volumes that are above average for 
this time of year. Current seasonal streamflow forecasts for the 
April to July period have increased slightly from those issued last 
month. Forecasts for the remainder of the season (June to July) range 
from 22 percent for the Cucharas River near La Veta to 36 percent of 
average for the Huerfano River near Redwing. The Arkansas River at 
Salida is expected to flow at 24 percent of average from June to 
July!25 UPPER RIO GRANDE BASIN
It comes as no surprise that the snowpack in the Upper Rio Grande 
basin was completely depleted as of June 1 with the snowpack 
percentage a big zero. Last month the snowpack percentage was just 15 
percent of average with only two of the four sub basins holding any 
snow. Persistent warm and dry conditions made sure that all 
measurable snow was melted by May 27 leaving dry slopes nearly a 
month ahead of the normal melt out date. Precipitation in the basin 
during May was 51 percent of average, and water year to date 
precipitation is now 85 percent of average. This percentage may not 
seem so low but it is important to keep in mind that it is skewed 
heavily by the well above average precipitation in the basin received 
back in October. 
Reservoir storage in the basin is currently showing the effect of the 
below average snowpack received this year. The six reservoirs in the 
Upper Rio Grande basin are currently storing 59,000 acre feet of 
water, which is 57 percent of the average storage for June 1. This is 
an 8,000 acre feet reduction from volumes reported last month. 
Current streamflow forecasts issued on June 1 have increased slightly 
from those issued last month due to higher than expected observed 
flows in April and May. The forecasts for June to September now range 
from 39 percent of average flows expected on Saguache Creek near 
Saguache to 26 percent of average flows into Platoro Reservoir.

================================================================================
                              ARKANSAS RIVER BASIN
                      Streamflow Forecasts - June 1, 2012
================================================================================
            |  <=== Drier ===  Future  Conditions  === Wetter ===>  |
            |                                                       |
Forecast Pt | ===============  Chance of Exceeding * ============== |
   Forecast |  90%       70%   |       50%       |  30%       10%   | 30 Yr Avg
   Period   |(1000AF)  (1000AF)|(1000AF) (% AVG.)|(1000AF)  (1000AF)| (1000AF)
================================================================================
Chalk Ck nr Nathrop
   APR-JUL      5.6      7.1       8.5       37      10.2     13.1        23  
   JUN-JUL      1.3      2.8       4.2       23       5.9      8.8      18.0  
   APR-SEP      6.0      8.2      10.2       38      12.6     16.8        27  
   JUN-SEP      1.7      3.9       5.9       26       8.3     12.5        23  

Arkansas R at Salida (2)
   APR-JUL       64       79        92       36       107      133       255  
   JUN-JUL     16.0       31        44       24        59       85       187  
   APR-SEP       70       91       110       36       132      171       310  
   JUN-SEP       22       43        62       25        84      123       245  

Grape Ck nr Westcliffe
   APR-JUL      1.9      3.0       4.2       26       5.8      8.9      16.1  
   JUN-JUL      0.2      1.3       2.4       27       4.0      7.2       8.8  
   APR-SEP      2.2      3.6       5.2       27       7.2     11.0      19.6  
   JUN-SEP      0.5      1.8       3.4       28       5.4      9.2      12.3  

Arkansas R ab Pueblo (2)
   APR-JUL       80       99       116       30       135      169       385  
   JUN-JUL       24       43        60       23        79      113       259  
   APR-SEP       92      121       146       30       175      225       485  
   JUN-SEP       36       65        90       25       119      169       360  

Huerfano R nr Redwing
   APR-JUL      4.4      5.3       6.0       49       6.9      8.3      12.3  
   JUN-JUL      1.2      2.1       2.8       36       3.7      5.1       7.7  
   APR-SEP      5.1      6.4       7.5       48       8.7     10.8      15.5  
   JUN-SEP      1.9      3.2       4.3       39       5.5      7.6      11.0  

Cucharas R nr La Veta
   APR-JUL      6.7      7.2       7.6       67       8.1      9.1      11.3  
   JUN-JUL      0.4      0.9       1.3       22       1.8      2.8       6.0  
   APR-SEP      7.4      8.1       8.7       67       9.4     10.6      13.0  
   JUN-SEP      1.1      1.8       2.4       31       3.1      4.3       7.8  

Purgatoire R at Trinidad (2)
   MAR-JUL     10.6     12.5      14.2       42      16.4       20        34  
   JUN-JUL      1.0      2.9       4.6       24       6.8     10.4      19.0  
   APR-SEP     12.3     16.4        20       46        24       32        44  
   JUN-SEP      4.0      8.1      11.7       38      15.7       24        31  

================================================================================
   * 90%, 70%, 50%, 30%, and 10% chances of exceeding are the probabilities that
     the actual volume will exceed the volumes in the table.

   The average is computed for the 1971-2000 base period.

   (1) - The values listed under the 10% and 90% Chance of Exceeding are
         actually 5% and 95% exceedance levels.
   (2) - The value is natural volume - actual volume may be affected by upstream
         water management.
   (3) - Median value used in place of average.
================================================================================
                              ARKANSAS RIVER BASIN
                   Reservoir Storage (1000AF) End of May
================================================================================
                                Usable     ********** Usable Storage *********
Reservoir                      Capacity    This Year    Last Year      Average
================================================================================
ADOBE                             62.0         22.1         25.0         33.0   
CLEAR CREEK                       11.4          7.5          5.8          6.3   
CUCHARAS RESERVOIR                40.0          0.1          0.1          6.4   
GREAT PLAINS                     150.0          0.0          0.0         39.3   
HOLBROOK                           7.0          0.5          0.9          4.1   
HORSE CREEK                       27.0          0.0          0.0         10.0   
JOHN MARTIN                      616.0         28.4         35.8        128.1   
LAKE HENRY                         8.0          6.4          7.1          5.7   
MEREDITH                          42.0         21.6         22.9         18.5   
PUEBLO                           354.0        211.9        219.7        160.1   
TRINIDAD                         167.0         16.1         17.6         29.7   
TURQUOISE                        127.0         81.3         51.4         77.6   
TWIN LAKES                        86.0         43.8         17.9         42.6   
================================================================================

================================================================================
                              ARKANSAS RIVER BASIN
                   Watershed Snowpack Analysis - June 1, 2012
================================================================================
                                 Number of           This Year as Percent of
Watershed                        Data Sites          Last Year       Average
================================================================================
UPPER ARKANSAS BASIN                  3                  3                  4
CUCHARAS & HUERFANO RIVER BA          2                  0                  0
PURGATOIRE RIVER BASIN                2                  0                  0
TOTAL ARKANSAS RIVER BASIN            6                  3                  4
================================================================================


	SAN MIGUEL, DOLORES, ANIMAS, AND SAN JUAN RIVER BASINS as of June 1, 2012

Out of the 16 SNOTEL sites located in these basins, none of them had 
any measurable snow remaining at them on June 1. By May 27, warm 
temperatures coupled with dry conditions had completely melted out 
the well below average snowpack nearly a month before the average 
melt out date. The combined San Miguel, Dolores, Animas and San Juan 
basins fared better than other basins in the state this water year as 
far as snow accumulation was concerned, in that they did not approach 
the low snowpack numbers reported during the drought of 2002.
May produced the lowest monthly precipitation totals recorded so far 
this water year in the basins. May precipitation at SNOTEL sites in 
these basins was a dismal 14 percent of average; the lowest monthly 
precipitation reported, as a percent of average, by any basin in 
Colorado for any month so far this water year! As a result year to 
date precipitation dropped from 84 percent of average reported on May 
1 to 77 percent of average as of June 1. 
Storage volumes in the basins continue to remain in good shape at 106 
percent of average at the end of May and 96 percent of volumes 
reported last year.Seasonal streamflow forecasts issued this month 
for the April to July period have dropped again from those issued 
last month. Forecasts for the remainder of the season (June to July), 
range from 12 percent of average for the Inflow to McPhee Reservoir 
to 26 percent of average expected on the San Miguel River near 
Placerville and also on the Animas River at Durango.

================================================================================
                              SAN MIGUEL, DOLORES, ANIMAS, AND SAN JUAN RIVER BASINS
                      Streamflow Forecasts - June 1, 2012
================================================================================
            |  <=== Drier ===  Future  Conditions  === Wetter ===>  |
            |                                                       |
Forecast Pt | ===============  Chance of Exceeding * ============== |
   Forecast |  90%       70%   |       50%       |  30%       10%   | 30 Yr Avg
   Period   |(1000AF)  (1000AF)|(1000AF) (% AVG.)|(1000AF)  (1000AF)| (1000AF)
================================================================================
Dolores R at Dolores
   APR-JUL      105      110       113       43       117      125       265  
   JUN-JUL     11.0     16.0        20       18        24       32       113  

McPhee Reservoir Inflow (2)
   APR-JUL      105      110       115       36       120      128       320  
   JUN-JUL      7.0     12.0      16.0       12        21       29       130  

San Miguel R nr Placerville
   APR-JUL       52       55        58       44        61       66       132  
   JUN-JUL     14.8     18.3        21       26        24       29        81  

Gurley Reservoir Inlet
   APR-JUL      4.4      5.9       7.0       38       8.3     10.4      18.3  
   JUN-JUL      0.6      1.0       1.5       19       2.1      3.2       8.0  

Cone Reservoir Inlet
   APR-JUL      0.2      0.6       1.0       31       1.6      2.7       3.3  
   JUN-JUL      0.0      0.1       0.2       13       0.4      0.8       1.5  

Lilylands Reservoir Inlet
   APR-JUL      0.6      0.8       1.0       34       1.2      1.6       2.9  
   JUN-JUL      0.1      0.1       0.2       15       0.3      0.5       1.3  

Rio Blanco at Blanco Diversion (2)
   APR-JUL       22       23        25       47        28       32        53  
   JUN-JUL      2.0      2.3       5.0       20       7.7     11.6        25  

Navajo R at Oso Diversion (2)
   APR-JUL       29       31        32       46        34       36        69  
   JUN-JUL      5.1      6.7       8.0       23       9.4     11.8        35  

San Juan R nr Carracas (2)
   APR-JUL      155      162       179       44       196      220       405  
   JUN-JUL     16.0       23        40       22        57       81       186  

Piedra R nr Arboles
   APR-JUL       90      100       106       46       112      121       230  
   JUN-JUL      4.7     13.8        20       23        26       35        89  

Vallecito Reservoir Inflow (2)
   APR-JUL       96      102       106       52       110      117       205  
   JUN-JUL     17.0       24        28       24        32       39       116  

Navajo Reservoir Inflow (2)
   APR-JUL      300      305       330       42       355      385       785  
   JUN-JUL       20       27        50       15        73      106       340  

Animas R at Durango
   APR-JUL      200      220       230       52       240      255       440  
   JUN-JUL       38       54        65       26        76       92       250  

Lemon Reservoir Inflow (2)
   APR-JUL       30       32        33       57        35       38        58  
   JUN-JUL      3.8      5.8       7.3       22       9.0     11.9        33  

La Plata R at Hesperus
   APR-JUL     10.3     10.7      11.1       44      11.5     12.2        25  
   JUN-JUL      1.2      1.6       2.0       18       2.4      3.1      11.0  

Mancos River Near Mancos
   APR-JUL     11.9     12.4      12.9       39      13.4     14.4        33  

Mancos R nr Mancos (2)
   JUN-JUL      1.5      2.0       2.5       15       3.0      4.0      16.4  

================================================================================
   * 90%, 70%, 50%, 30%, and 10% chances of exceeding are the probabilities that
     the actual volume will exceed the volumes in the table.

   The average is computed for the 1971-2000 base period.

   (1) - The values listed under the 10% and 90% Chance of Exceeding are
         actually 5% and 95% exceedance levels.
   (2) - The value is natural volume - actual volume may be affected by upstream
         water management.
   (3) - Median value used in place of average.
================================================================================
                              SAN MIGUEL, DOLORES, ANIMAS, AND SAN JUAN RIVER BASINS
                   Reservoir Storage (1000AF) End of May
================================================================================
                                Usable     ********** Usable Storage *********
Reservoir                      Capacity    This Year    Last Year      Average
================================================================================
GROUNDHOG                         22.0         10.1         21.0         18.9   
JACKSON GULCH                     10.0          8.2          7.8          9.3   
LEMON                             40.0         32.0         23.8         29.2   
MCPHEE                           381.0        338.2        364.3        328.0   
NARRAGUINNEP                      19.0         13.6         18.4         17.4   
VALLECITO                        126.0        123.9        111.3         93.9   
================================================================================

================================================================================
                              SAN MIGUEL, DOLORES, ANIMAS, AND SAN JUAN RIVER BASINS
                   Watershed Snowpack Analysis - June 1, 2012
================================================================================
                                 Number of           This Year as Percent of
Watershed                        Data Sites          Last Year       Average
================================================================================
ANIMAS RIVER BASIN                    7                  0                  0
DOLORES RIVER BASIN                   4                  0                  0
SAN MIGUEL RIVER BASIN                3                  0                  0
SAN JUAN RIVER BASIN                  3                  0                  0
TOTAL SAN MIGUEL, DOLORES, A         16                  0                  0
================================================================================

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