USDA NRCS National Water & Climate Center * - DATA CURRENT AS OF: March 03, 2023 05:03:24 PM - Based on March 01, 2023 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 MAR-JUL 2.1 375 3.0 2.5 1.73 1.17 0.56 APR-JUL 1.70 425 2.6 2.0 1.35 0.83 0.40 Lake Tahoe Rise (Gates Closed) (1) (ft)* MAR-HIGH 2.5 179 3.8 2.9 2.1 1.25 1.40 APR-HIGH 2.2 190 3.1 2.5 1.90 1.30 1.16 Lk Tahoe Net Inflow MAR-JUL 425 306 569 483 367 281 139 APR-JUL 290 287 396 333 248 185 101 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) MAR-JUL 31 161 40 35 27 22 19.2 APR-JUL 24 160 31 27 21 16.6 15.0 Martis Ck Res Inflow (2) MAR-JUL 25 281 32 28 22 17.7 8.9 APR-JUL 18.0 316 25 21 15.3 11.4 5.7 Prosser Ck Res Inflow (2) MAR-JUL 81 193 100 89 73 62 42 APR-JUL 69 197 87 76 62 51 35 Independence Lk Inflow (2) MAR-JUL 21 184 26 23 19.3 16.6 11.4 APR-JUL 18.0 171 22 19.7 16.3 13.7 10.5 Sagehen Ck nr Truckee MAR-JUL 11.2 233 14.5 12.6 9.9 7.9 4.8 APR-JUL 10.0 244 13.2 11.3 8.7 6.8 4.1 Stampede Res Local Inflow (2) MAR-JUL 163 236 206 180 146 120 69 APR-JUL 138 234 178 154 122 98 59 L Truckee R ab Boca Reservoir (2)* MAR-JUL 200 233 251 221 179 149 86 APR-JUL 155 215 210 175 135 110 72 Boca Res Local Inflow (2) MAR-JUL 21 477 27 24 18.9 15.4 4.4 APR-JUL 11.5 757 16.1 13.4 9.6 6.9 1.52 Truckee R ab Farad Sidewater (2) MAR-JUL 212 200 266 234 190 157 106 APR-JUL 183 203 233 203 162 132 90 Truckee R at Farad (2)* MAR-JUL 550 208 683 604 496 417 265 APR-JUL 450 200 575 500 400 330 225 Galena Ck at Galena Ck State Pk MAR-JUL 8.2 186 10.3 9.0 7.3 6.1 4.4 APR-JUL 7.5 188 9.6 8.4 6.7 5.5 4.0 Steamboat Ck at Steamboat MAR-JUL 20 741 34 25 15.4 9.7 2.7 APR-JUL 16.1 767 27 20 12.4 7.8 2.1 Pyramid Lk Elevation Change (1) (ft) LOW-HIGH 4.0 7.0 5.2 2.8 0.97 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 MAR-JUL 460 250 544 494 426 376 184 APR-JUL 400 244 479 432 368 321 164 Date of 200 cfs flow (julian_day) 200 cfs Sep 12 Oct 06 Sep 22 Sep 02 Aug 19 Jul 14 Date of 500 cfs flow (julian_day) 500 cfs Aug 14 Sep 11 Aug 25 Aug 03 Jul 17 Jun 20 WF Carson R nr Woodfords MAR-JUL 120 240 144 130 110 96 50 APR-JUL 100 222 124 110 90 76 45 Carson R nr Carson City MAR-JUL 465 296 666 542 394 300 157 APR-JUL 415 312 523 459 371 307 133 Marlette Lake Inflow MAR-JUL 2.1 375 3.0 2.5 1.73 1.17 0.56 APR-JUL 1.70 425 2.6 2.0 1.35 0.83 0.40 Kings Canyon Ck nr Carson City MAR-JUL 0.50 263 0.75 0.59 0.41 0.29 0.190 APR-JUL 0.38 292 0.60 0.46 0.31 0.21 0.130 Ash Canyon Ck nr Carson City MAR-JUL 1.85 180 2.5 2.1 1.62 1.30 1.03 APR-JUL 1.56 190 2.1 1.78 1.35 1.07 0.82 Carson R at Ft Churchill* MAR-JUL 521 338 638 568 474 404 154 APR-JUL 450 344 570 490 410 350 131 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) MAR-AUG 190 373 231 207 173 149 51 APR-AUG 165 375 204 181 149 126 44 W Walker R bl L Walker nr Coleville MAR-JUL 335 211 402 362 308 268 159 APR-JUL 315 206 381 342 288 249 153 W Walker R nr Coleville MAR-JUL 355 231 421 382 328 288 154 APR-JUL 338 230 404 364 311 272 147 Walker Lake Elevation Change (1) (ft) (1) LOW-HIGH 7.4 10.0 8.5 6.4 4.9 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 MAR-JUN 24 218 35 28 19.7 14.4 11.0 APR-JUL 16.9 232 28 21 13.3 8.8 7.3 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 MAR-JUL 46 159 65 54 38 27 29 APR-JUL 42 162 61 50 34 23 26 Lamoille Ck nr Lamoille MAR-JUL 46 170 57 50 42 35 27 APR-JUL 44 169 55 48 40 33 26 NF Humboldt R at Devils Gate MAR-JUL 57 248 83 68 47 32 23 APR-JUL 43 239 64 51 34 21 18.0 Humboldt R nr Elko MAR-JUL 270 346 357 305 235 183 78 APR-JUL 230 333 317 265 195 143 69 SF Humboldt R ab Dixie Ck MAR-JUL 175 330 220 193 157 130 53 APR-JUL 160 314 205 178 142 115 51 SF Humboldt R abv Tenmile Ck nr Elko MAR-JUL 175 318 219 193 157 131 55 APR-JUL 165 317 209 183 147 121 52 Humboldt R nr Carlin MAR-JUL 490 438 692 568 418 323 112 APR-JUL 420 420 615 494 352 262 100 Humboldt R at Palisade MAR-JUL 560 441 788 648 479 371 127 APR-JUL 465 427 681 547 389 290 109 LOWER HUMBOLDT RIVER BASIN 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Rock Ck nr Battle Mountain MAR-JUL 45 395 77 57 34 21 11.4 APR-JUL 28 459 55 38 20 10.4 6.1 Humboldt R at Comus MAR-JUL 470 480 671 547 399 305 98 APR-JUL 350 443 527 417 289 209 79 L Humboldt R nr Paradise Valley (2) MAR-JUL 14.6 124 25 18.7 10.4 4.3 11.8 APR-JUL 9.6 166 17.8 12.9 6.3 1.46 5.8 Martin Ck nr Paradise Valley MAR-JUL 25 171 37 30 20 12.8 14.6 APR-JUL 20 185 32 25 15.3 8.4 10.8 Humboldt R nr Imlay MAR-JUL 375 577 561 446 310 227 65 APR-JUL 300 577 465 362 243 171 52 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 APR-JUL 25 128 32 28 22 17.3 19.6 APR-SEP 25 125 33 28 22 17.9 20 Bruneau R at Rowland APR-JUL 58 121 87 70 46 29 48 APR-SEP 59 120 89 71 47 29 49 Salmon Falls Ck nr San Jacinto MAR-JUL 92 144 134 108 77 58 64 MAR-SEP 95 144 138 111 80 60 66 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 (2) MAR-JUL 27 123 46 34 21 13.3 22 APR-JUL 20 116 41 28 13.6 6.4 17.2 EASTERN NEVADA 50% % of max 30% 70% min 30-yr Forecast Point period (KAF) med (KAF) (KAF) (KAF) (KAF) med -------------- ------ ----- ---- ----- ----- ----- ----- ----- Kingston Ck nr Austin APR-JUL 7.6 427 12.1 9.3 6.1 4.2 1.78 Lehman Ck nr Baker APR-JUL 4.7 236 6.4 5.4 4.0 3.0 1.99 Cleve Ck nr Ely APR-JUL 8.5 315 12.4 10.0 7.1 5.3 2.7 Steptoe Ck nr Ely APR-JUL 5.7 419 8.2 6.7 4.8 3.6 1.36 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 115 371 171 136 96 70 31 Virgin R at Littlefield APR-JUL 124 376 183 147 103 76 33 Lake Powell Inflow (2) APR-JUL 8120 132 11700 9480 6860 5200 6130 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.