USDA NRCS National Water & Climate Center * - DATA CURRENT AS OF: February 06, 2023 09:14:33 AM - Based on February 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 3.1 2.5 1.71 1.13 0.56 APR-JUL 1.69 423 2.6 2.0 1.34 0.82 0.40 Lake Tahoe Rise (Gates Closed) (1) (ft)* OCT-HIGH 4.5 283 6.3 5.1 4.0 2.8 1.59 MAR-HIGH 2.5 179 4.1 3.0 2.0 0.95 1.40 APR-HIGH 2.1 181 3.2 2.5 1.70 1.00 1.16 Lk Tahoe Net Inflow MAR-JUL 423 304 554 476 369 291 139 APR-JUL 300 297 398 340 260 202 101 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 42 35 27 20 19.2 APR-JUL 24 160 33 28 20 15.2 15.0 Martis Ck Res Inflow (2) MAR-JUL 24 270 33 28 20 14.7 8.9 APR-JUL 15.0 263 23 18.2 11.8 7.2 5.7 Prosser Ck Res Inflow (2) MAR-JUL 79 188 102 88 70 56 42 APR-JUL 62 177 83 70 54 41 35 Independence Lk Inflow (2) MAR-JUL 21 184 27 24 19.2 16.1 11.4 APR-JUL 18.0 171 23 20 16.0 13.1 10.5 Sagehen Ck nr Truckee MAR-JUL 11.0 229 15.2 12.7 9.2 6.7 4.8 APR-JUL 9.0 220 13.0 10.6 7.4 5.0 4.1 Stampede Res Local Inflow (2) MAR-JUL 161 233 213 182 140 109 69 APR-JUL 125 212 173 144 106 77 59 L Truckee R ab Boca Reservoir (2)* MAR-JUL 180 209 243 206 154 117 86 APR-JUL 145 201 210 170 120 86 72 Boca Res Local Inflow (2) MAR-JUL 21 477 28 24 17.6 13.0 4.4 APR-JUL 11.0 724 16.8 13.4 8.6 5.2 1.52 Truckee R ab Farad Sidewater (2) MAR-JUL 207 195 272 233 181 142 106 APR-JUL 179 199 239 203 155 119 90 Truckee R at Farad (2)* MAR-JUL 480 181 651 549 411 309 265 APR-JUL 400 178 565 475 340 270 225 Galena Ck at Galena Ck State Pk MAR-JUL 8.1 184 10.5 9.0 7.1 5.6 4.4 APR-JUL 7.4 185 9.8 8.4 6.5 5.1 4.0 Steamboat Ck at Steamboat MAR-JUL 18.9 700 38 26 13.1 6.4 2.7 APR-JUL 15.4 733 31 21 10.7 5.3 2.1 Pyramid Lk Elevation Change (1) (ft) LOW-HIGH 4.2 6.4 5.1 3.3 1.97 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 410 223 522 455 365 298 184 APR-JUL 370 226 515 454 372 311 164 Date of 200 cfs flow (julian_day) 200 cfs Sep 10 Oct 08 Sep 21 Aug 30 Aug 13 Jul 14 Date of 500 cfs flow (julian_day) 500 cfs Aug 17 Sep 14 Aug 28 Aug 06 Jul 20 Jun 20 WF Carson R nr Woodfords MAR-JUL 110 220 143 124 96 77 50 APR-JUL 100 222 133 113 87 67 45 Carson R nr Carson City MAR-JUL 450 287 602 511 389 298 157 APR-JUL 400 301 582 503 395 316 133 Marlette Lake Inflow MAR-JUL 2.1 375 3.1 2.5 1.71 1.13 0.56 APR-JUL 1.69 423 2.6 2.0 1.34 0.82 0.40 Kings Canyon Ck nr Carson City MAR-JUL 0.54 285 0.92 0.68 0.42 0.26 0.190 APR-JUL 0.42 325 0.75 0.54 0.32 0.190 0.130 Ash Canyon Ck nr Carson City MAR-JUL 2.0 194 2.9 2.3 1.69 1.28 1.03 APR-JUL 1.70 208 2.5 2.0 1.43 1.06 0.82 Carson R at Ft Churchill* MAR-JUL 450 292 597 509 391 303 154 APR-JUL 385 294 520 455 340 290 131 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 180 353 237 203 157 123 51 APR-AUG 154 350 207 176 132 101 44 W Walker R bl L Walker nr Coleville MAR-JUL 330 208 410 363 297 250 159 APR-JUL 310 203 389 342 278 231 153 W Walker R nr Coleville MAR-JUL 345 224 426 378 313 265 154 APR-JUL 328 223 407 360 296 249 147 Walker Lake Elevation Change (1) (ft) (1) LOW-HIGH 7.0 10.0 8.2 5.8 4.0 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 28 255 44 34 23 16.4 11.0 APR-JUL 20 274 34 25 15.9 10.3 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 50 172 74 60 40 26 29 APR-JUL 44 169 67 53 35 21 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 62 270 87 72 52 37 23 APR-JUL 45 250 68 54 36 22 18.0 Humboldt R nr Elko MAR-JUL 270 346 378 314 226 162 78 APR-JUL 230 333 332 271 189 128 69 SF Humboldt R ab Dixie Ck MAR-JUL 155 292 203 175 135 107 53 APR-JUL 145 284 193 164 126 97 51 SF Humboldt R abv Tenmile Ck nr Elko MAR-JUL 155 282 205 175 135 105 55 APR-JUL 145 279 194 165 125 96 52 Humboldt R nr Carlin MAR-JUL 480 429 716 570 398 291 112 APR-JUL 410 410 630 493 334 237 100 Humboldt R at Palisade MAR-JUL 550 433 819 653 456 334 127 APR-JUL 450 413 695 543 366 258 109 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 42 368 82 57 30 15.6 11.4 APR-JUL 27 443 58 38 17.3 7.2 6.1 Humboldt R at Comus MAR-JUL 500 510 763 600 409 293 98 APR-JUL 380 481 604 464 304 208 79 L Humboldt R nr Paradise Valley (2) MAR-JUL 17.1 145 27 21 13.0 7.0 11.8 APR-JUL 10.7 184 18.5 13.9 7.6 3.0 5.8 Martin Ck nr Paradise Valley MAR-JUL 33 226 48 39 27 17.8 14.6 APR-JUL 26 241 40 31 20 12.3 10.8 Humboldt R nr Imlay MAR-JUL 375 577 618 466 294 193 65 APR-JUL 300 577 509 378 231 146 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 24 122 32 27 21 16.5 19.6 APR-SEP 25 125 33 28 22 17.1 20 Bruneau R at Rowland APR-JUL 58 121 90 71 45 26 48 APR-SEP 59 120 91 72 46 27 49 Salmon Falls Ck nr San Jacinto MAR-JUL 80 125 126 97 64 44 64 MAR-SEP 83 126 129 100 67 47 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 28 127 51 37 21 11.8 22 APR-JUL 21 122 45 30 13.8 5.9 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 7.4 416 12.0 9.1 5.8 3.9 1.78 Lehman Ck nr Baker APR-JUL 5.3 266 7.0 5.9 4.6 3.5 1.99 Cleve Ck nr Ely APR-JUL 10.5 389 14.9 12.2 8.9 6.9 2.7 Steptoe Ck nr Ely APR-JUL 6.6 485 9.2 7.6 5.7 4.5 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 101 326 169 126 78 50 31 Virgin R at Littlefield APR-JUL 111 336 182 138 88 58 33 Lake Powell Inflow (2) APR-JUL 8110 132 12000 9580 6760 5000 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.