USDA NRCS National Water & Climate Center * - DATA CURRENT AS OF: May 06, 2025 01:45:29 PM - Based on May 01, 2025 forecast values LAKE TAHOE BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Marlette Lake Inflow (2) MAR-JUN 0.46 59 0.80 0.60 0.32 0.120 0.78 MAY-JUN 0.30 100 0.64 0.44 0.160 -0.04 0.30 Lake Tahoe Rise Gates Closed (ft) (2)* APR-HIGH 1.05 92 1.39 1.20 0.97 0.85 1.14 MAY-HIGH 0.73 101 1.20 0.88 0.58 0.26 0.72 TRUCKEE RIVER BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Donner Lake Inflow (2) APR-JUL 13.6 91 18.2 15.5 12.6 11.6 15.0 MAY-JUL 7.0 85 11.6 8.9 6.0 5.0 8.2 Martis Ck Res Inflow (2) APR-JUL 5.8 102 7.3 6.4 5.4 4.8 5.7 MAY-JUL 2.8 108 4.3 3.4 2.4 1.80 2.6 Prosser Ck Res Inflow (2) APR-JUL 32 91 39 35 30 26 35 MAY-JUL 20 91 27 23 17.3 13.4 22 Independence Lk Inflow (2) APR-JUL 9.7 92 11.7 10.5 8.9 7.7 10.5 MAY-JUL 7.0 88 9.0 7.8 6.2 5.0 8.0 Sagehen Ck nr Truckee APR-JUL 4.2 102 5.7 4.8 3.6 2.7 4.1 MAY-JUL 2.5 114 4.0 3.1 1.91 1.04 2.2 Little Truckee R bl Stampede Dam (2) APR-JUL 66 96 85 74 58 47 69 MAY-JUL 40 93 59 48 32 21 43 Little Truckee R bl Boca Dam (2)* APR-JUL 75 104 90 85 69 65 72 MAY-JUL 48 109 63 58 42 38 44 Truckee R ab Farad Sidewater (2) APR-JUL 91 101 110 98 84 72 90 MAY-JUL 63 100 82 70 56 44 63 Truckee R at Farad (2)* APR-JUL 210 93 245 225 205 190 225 MAY-JUL 132 95 167 147 127 112 139 Galena Ck at Galena Ck State Pk APR-JUL 3.7 93 4.9 4.2 3.2 2.5 4.0 MAY-JUL 3.1 97 4.3 3.6 2.6 1.87 3.2 Pyramid Lk Elevation Change (ft) LOW-HIGH 1.06 2.4 1.61 0.51 -0.30 CARSON RIVER BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- EF Carson R nr Gardnerville APR-JUL 136 83 167 149 123 105 164 MAY-JUL 98 84 129 111 85 67 116 Date of 200 cfs flow (julian_day) 200 cfs Jul 02 Jul 14 Jul 07 Jun 27 Jun 20 Jul 14 Date of 500 cfs flow (julian_day) 500 cfs Jun 08 Jun 28 Jun 16 May 31 May 19 Jun 20 WF Carson R nr Woodfords APR-JUL 33 73 45 38 28 21 45 MAY-JUL 23 77 35 28 18.0 10.6 30 Carson R nr Carson City APR-JUL 111 83 150 127 95 72 133 MAY-JUL 79 81 118 95 63 40 97 Marlette Lake Inflow (2) MAR-JUN 0.46 59 0.80 0.60 0.32 0.120 0.78 MAY-JUN 0.30 100 0.64 0.44 0.160 -0.04 0.30 Kings Canyon Ck nr Carson City APR-JUL 0.180 138 0.29 0.22 0.150 0.110 0.130 MAY-JUL 0.110 110 0.22 0.150 0.080 0.040 0.100 Ash Canyon Ck nr Carson City APR-JUL 0.84 102 1.08 0.93 0.75 0.64 0.82 MAY-JUL 0.64 105 0.88 0.73 0.55 0.44 0.61 Carson R at Ft Churchill* APR-JUL 105 80 140 120 95 75 131 MAY-JUL 74 78 109 89 64 44 95 WALKER RIVER BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- E Walker R nr Bridgeport (2) APR-JUL 33 77 46 38 28 22 43 APR-AUG 36 82 49 41 32 26 44 MAY-JUL 29 74 42 34 24 18.5 39 MAY-AUG 32 78 45 37 28 22 41 W Walker R bl L Walker nr Coleville APR-JUL 124 81 148 134 114 100 153 MAY-JUL 103 82 127 113 93 79 126 W Walker R nr Coleville APR-JUL 120 82 146 130 110 94 147 MAY-JUL 100 82 126 110 90 74 122 Walker Lake Elevation Change (ft) LOW-HIGH 0.65 2.5 1.42 -0.12 -1.25 NORTHERN GREAT BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- McDermitt Ck nr McDermitt APR-JUL 6.5 89 9.8 7.7 5.5 4.3 7.3 MAY-JUL 3.6 78 6.9 4.8 2.6 1.35 4.6 UPPER HUMBOLDT RIVER BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Marys R nr Deeth APR-JUL 27 104 37 31 24 20 26 MAY-JUL 17.0 90 27 21 14.0 10.2 18.8 Lamoille Ck nr Lamoille APR-JUL 22 85 26 23 18.5 16.1 26 MAY-JUL 20 80 24 21 16.4 14.0 25 NF Humboldt R at Devils Gate APR-JUL 11.7 65 30 14.7 7.8 6.2 18.0 MAY-JUL 7.0 54 25 10.0 3.1 1.50 12.9 Humboldt R nr Elko APR-JUL 59 86 94 74 44 25 69 MAY-JUL 42 70 77 57 27 8.0 60 SF Humboldt R ab Dixie Ck APR-JUL 39 76 66 50 29 24 51 MAY-JUL 30 65 57 41 20 15.0 46 SF Humboldt R abv Tenmile Ck nr Elko APR-JUL 41 79 64 50 32 26 52 MAY-JUL 30 65 53 39 21 15.0 46 Humboldt R nr Carlin APR-JUL 97 97 145 115 81 61 100 MAY-JUL 70 82 118 88 54 34 85 Humboldt R at Palisade APR-JUL 103 94 152 121 87 66 109 MAY-JUL 73 83 122 91 57 36 88 LOWER HUMBOLDT RIVER BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Humboldt R at Comus APR-JUL 72 91 118 89 58 41 79 MAY-JUL 48 79 94 65 34 17.1 61 L Humboldt R nr Paradise Valley (2) MAY-JUL 3.0 107 7.9 5.0 2.0 0.50 2.8 Martin Ck nr Paradise Valley APR-JUL 12.5 116 16.5 14.5 11.5 9.5 10.8 MAY-JUL 8.0 118 12.0 10.0 7.0 5.0 6.8 Humboldt R nr Imlay APR-JUL 54 104 98 70 41 28 52 MAY-JUL 35 106 79 51 22 8.5 33 SNAKE RIVER BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Jarbidge River Below Jarbidge May-Jul 15.3 90 19.3 17.0 13.5 11.9 17 May-Sep 15.9 90 20.0 17.6 14.2 12.2 17.6 Bruneau R at Rowland May-Jul 27 87 44 33 22 15.3 31 May-Sep 27 87 43 32 22 16.5 31 Salmon Falls Ck nr San Jacinto May-Jul 31 78 49 38 24 16.5 40 May-Sep 33 77 50 39 26 20 43 OYWHEE RIVER BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Owyhee R nr Gold Ck May-Jul 3.1 61 12.7 6.4 0.68 0.01 5.1 EASTERN NEVADA 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Kingston Ck nr Austin MAY-JUL 1.29 88 2.8 1.82 0.85 0.38 1.47 Lehman Ck nr Baker APR-JUL 1.26 63 2.6 1.85 1.04 0.76 1.99 MAY-JUL 1.20 64 2.5 1.79 0.98 0.70 1.88 Cleve Ck nr Ely APR-JUL 2.3 85 3.3 2.7 1.92 1.47 2.7 MAY-JUL 1.80 78 2.8 2.2 1.45 1.00 2.3 Steptoe Ck nr Ely APR-JUL 1.16 85 1.62 1.33 1.00 0.79 1.36 MAY-JUL 0.94 86 1.40 1.11 0.78 0.57 1.09 COLORADO BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Virgin R nr Hurricane APR-JUL 13.2 43 23 16.8 10.1 6.5 31 MAY-JUL 10.4 56 20 14.0 7.3 3.7 18.5 Virgin R at Littlefield APR-JUL 14.9 45 25 18.6 11.8 8.4 33 MAY-JUL 9.4 45 19.5 13.1 6.3 2.9 21 Lake Powell Inflow (2) APR-JUL 3560 58 5010 4110 3050 2400 6130 MAY-JUL 2980 57 4430 3530 2470 1820 5240 Max (10%), 30%, 50%, 70% and Min (90%) chance that actual volume will exceed forecast. Medians are for the 1991-2020 period. All volumes are in thousands of acre-feet. footnotes: 1) Max and Min are 5% and 95% chance that actual volume will exceed forecast 2) streamflow is adjusted for upstream storage * These forecasts are coordinated. Hydrologists with the NRCS and National Weather Service California Nevada River Forecast Center (CNRFC) coordinate Lake Tahoe Rise, Truckee River at Farad, Little Truckee River above Boca, and the Carson River near Ft. Churchill using output of their respective hydrology models at the request of the Bureau of Reclamation. The NRCS model is a statistical model based on the current data as of the first of each month. The CNRFC ensemble forecasting system incorporates near-term weather prediction and climatology into their model. These models can provide different answers because of the nature of the model systems, and from the inclusion of future weather in the CNRFC model. The hydrologists agree on forecast values using guidance from both models to best provide an accurate water supply forecast for these points.