United States Natural Resources Water and Climate Center Department of Conservation Portland, Oregon Agriculture Service S N O W - P R E C I P I T A T I O N U P D A T E Based on Mountain Data from NRCS SNOTEL Sites As of MONDAY: OCTOBER 19 , 2020 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 160* 103 SUSITNA BASIN ................................ 3 of 5 27* 32 NORTHERN KENAI MOUNTAINS ..................... 7 of 7 100* 130 SOUTHERN KENAI ............................... 3 of 6 * 122 COPPER BASIN ................................. 2 of 3 100* 64 PRINCE WILLIAM SOUND ......................... 1 of 7 * 108 CHENA BASIN .................................. 6 of 7 6 42 UPPER TANANA ................................. 2 of 4 10* * KOYUKUK BASIN ................................ 2 of 6 * 57 CENTRAL YUKON BASIN .......................... 0 of 5 * 41 NORTON SOUND ................................. 0 of 4 * 84 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 93 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * * ARIZONA VERDE RIVER BASIN ............................ 4 of 10 * * SAN FRANCISCO PEAKS .......................... 1 of 1 * 0 CENTRAL MOGOLLON RIM ......................... 3 of 4 * * LITTLE COLORADO RIVER BASIN .................. 4 of 11 * * SALT RIVER BASIN ............................. 6 of 10 * 11 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 * 3 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 7 of 8 * 89 TRUCKEE RIVER ................................ 11 of 12 * 3 LAKE TAHOE ................................... 11 of 11 * 2 CARSON RIVER ................................. 12 of 12 * 4 WALKER RIVER ................................. 7 of 7 * 9 COLORADO GUNNISON RIVER BASIN ......................... 12 of 16 73* 4 UPPER COLORADO RIVER BASIN ................... 30 of 35 58* 18 SOUTH PLATTE RIVER BASIN ..................... 16 of 22 54* 25 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12 41* 21 YAMPA AND WHITE RIVER BASINS ................. 20 of 22 84* 24 ARKANSAS RIVER BASIN ......................... 8 of 11 62* 12 UPPER RIO GRANDE BASIN ....................... 12 of 19 42* * SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 19 of 21 55* 4 IDAHO NORTHERN PANHANDLE REGION .................... 9 of 10 1750* 199 COEUR D'ALENE-ST. JOE RIVER BASIN ............ 7 of 7 833* 233 CLEARWATER BASIN ............................. 15 of 16 1850* 226 SALMON BASIN ................................. 20 of 20 133* 130 WEISER BASIN ................................. 4 of 4 * 138 PAYETTE BASIN ................................ 12 of 12 * 143 BOISE BASIN .................................. 9 of 10 167* 137 BIG WOOD BASIN ............................... 7 of 8 * 89 LITTLE WOOD BASIN ............................ 4 of 4 0* 54 BIG LOST BASIN ............................... 5 of 5 14* 40 LITTLE LOST, BIRCH BASINS .................... 4 of 4 100* 69 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 2 of 2 * 27 HENRYS FORK, TETON BASINS .................... 8 of 8 27* 79 SNAKE BASIN ABOVE PALISADES .................. 21 of 21 131* 99 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 * 42 SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29 89* 78 RAFT BASIN ................................... 1 of 2 * 200 GOOSE CREEK BASIN ............................ 2 of 2 * 88 SALMON FALLS BASIN ........................... 4 of 6 0* 91 BRUNEAU BASIN ................................ 5 of 8 0* 95 OWYHEE BASIN ................................. 7 of 12 * 80 BEAR RIVER BASIN ............................. 17 of 22 156* 60 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 654* 210 FLATHEAD RIVER BASIN ......................... 11 of 17 816* 248 UPPER CLARK FORK RIVER BASIN ................. 12 of 14 388* 196 BITTERROOT RIVER BASIN ....................... 8 of 8 522* 266 LOWER CLARK FORK RIVER BASIN ................. 9 of 9 1960* 227 JEFFERSON RIVER BASIN ........................ 19 of 20 134* 117 MADISON RIVER BASIN .......................... 12 of 12 85* 96 GALLATIN RIVER BASIN ......................... 6 of 7 197* 141 MISSOURI HEADWATERS .......................... 30 of 31 135* 117 MISSOURI HEADWATERS MAINSTEM ................ 4 of 4 454* 151 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 8 of 9 414* 119 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 1543* 215 MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21 602* 168 ST. MARYS RIVER BASIN ........................ 2 of 2 829* 208 MILK RIVER BASIN ............................. 1 of 1 * 158 UPPER YELLOWSTONE RIVER BASIN ................ 20 of 23 213* 153 WIND RIVER BASIN (WYOMING) ................... 11 of 13 85* 86 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 163* 155 BIGHORN RIVER BASIN (WYOMING) ................ 23 of 26 132* 95 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 195* 128 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 187* 74 LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35 146* 102 NEVADA NORTHERN GREAT BASIN ......................... 7 of 8 * 89 SNAKE RIVER .................................. 7 of 11 0* 92 OWYHEE RIVER ................................. 5 of 10 * 74 UPPER HUMBOLDT RIVER ......................... 9 of 16 * 49 LOWER HUMBOLDT RIVER ......................... 5 of 10 * 76 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 * 43 EASTERN NEVADA BASINS ........................ 4 of 14 * * NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 5 * * UPPER RIO GRANDE BASIN - New Mexico .......... 6 of 11 * * SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 9 of 11 * * JEMEZ RIVER BASIN ............................ 3 of 4 * * SAN FRANCISCO RIVER BASIN .................... 5 of 6 * 4 GILA RIVER BASIN ............................. 3 of 3 * 0 MIMBRES RIVER BASIN .......................... 2 of 2 * 0 PECOS RIVER BASIN ............................ 3 of 3 * 0 SAN JUAN RIVER BASIN ......................... 12 of 13 40* 4 ANIMAS RIVER BASIN ........................... 7 of 7 100* 6 CANADIAN RIVER BASIN ......................... 4 of 6 * * ZUNI/BLUEWATER RIVER BASIN ................... 1 of 1 * 25 RIO HONDO BASIN .............................. 1 of 1 * * CHUSKA MOUNTAINS ............................. 0 of 2 * * OREGON OWYHEE ....................................... 7 of 12 * 80 MALHEUR ...................................... 3 of 3 * 128 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 19 * 141 UMATILLA, WALLA WALLA, WILLOW ................ 6 of 8 * 149 JOHN DAY ..................................... 13 of 13 * 93 UPPER DESCHUTES, CROOKED ..................... 13 of 14 * 131 HOOD, SANDY, LOWER DESCHUTES ................. 9 of 9 * 231 COAST RANGE .................................. 1 of 2 * 214 WILLAMETTE ................................... 16 of 23 * 153 ROGUE, UMPQUA ................................ 10 of 13 * 90 KLAMATH ...................................... 14 of 20 * 81 LAKE COUNTY, GOOSE LAKE ...................... 6 of 7 * 55 HARNEY ....................................... 10 of 12 * 97 UTAH RAFT RIVER ................................... 1 of 2 * 200 BEAR RIVER ................................... 19 of 25 222* 60 WEBER-OGDEN RIVERS ........................... 17 of 22 540* 31 PROVO R.-UTAH LAKE-JORDAN R. ................. 18 of 23 2200* 21 TOOELE VALLEY-VERNON CREEK ................... 2 of 4 * 17 NORTHEASTERN UINTAHS ......................... 7 of 12 83* 37 DUCHESNE RIVER ............................... 12 of 15 480* 15 PRICE-SAN RAFAEL ............................. 7 of 14 * 10 DIRTY DEVIL .................................. 6 of 11 100* 14 SOUTH EASTERN UTAH ........................... 4 of 10 * * UPPER SEVIER RIVER ........................... 14 of 23 30* 4 SAN PITCH RIVER .............................. 6 of 12 * 9 LOWER SEVIER RIVER ........................... 2 of 5 * * BEAVER RIVER ................................. 3 of 3 0* 5 ESCALANTE RIVER .............................. 4 of 5 * 9 SOUTHWESTERN UTAH ............................ 10 of 13 * 6 WASHINGTON SPOKANE ...................................... 9 of 9 900* 215 LOWER PEND OREILLE ........................... 5 of 5 * 211 UPPER COLUMBIA ............................... 6 of 9 1467* 214 CENTRAL COLUMBIA ............................. 9 of 11 * 267 UPPER YAKIMA ................................. 6 of 7 * 257 NACHES ....................................... 5 of 8 * 232 LOWER YAKIMA ................................. 2 of 4 * 190 KLICKITAT .................................... 2 of 4 * 153 LOWER SNAKE, WALLA WALLA ..................... 11 of 14 * 149 LOWER COLUMBIA ............................... 11 of 17 * 199 SOUTH PUGET SOUND ............................ 10 of 14 * 221 CENTRAL PUGET SOUND .......................... 9 of 9 * 214 NORTH PUGET SOUND ............................ 9 of 13 2300* 166 OLYMPIC ...................................... 3 of 4 * 97 WYOMING SNAKE RIVER .................................. 22 of 22 94* 92 MADISON HEADWATERS IN WYOMING ................ 5 of 5 62* 82 YELLOWSTONE HEADWATERS IN WYOMING ............ 12 of 13 200* 175 WIND RIVER ................................... 10 of 12 92* 71 BIGHORN BASIN ................................ 10 of 11 144* 89 SHOSHONE RIVER ............................... 5 of 6 163* 155 POWDER RIVER ................................. 6 of 7 187* 74 TONGUE RIVER ................................. 6 of 7 195* 128 BELLE FOURCHE ................................ 2 of 3 * 112 CHEYENNE RIVER BASIN ......................... 1 of 2 * 121 UPPER N. PLATTE .............................. 17 of 20 37* 28 SWEETWATER ................................... 3 of 3 22* 45 LOWER N. PLATTE .............................. 3 of 4 17* 20 LARAMIE RIVER ................................ 6 of 7 138* 32 S. PLATTE .................................... 1 of 1 * 25 LITTLE SNAKE RIVER ........................... 8 of 9 53* 28 UPPER GREEN RIVER ............................ 14 of 15 38* 69 LOWER GREEN RIVER ............................ 7 of 12 38* 59 UPPER BEAR RIVER ............................. 11 of 13 144* 52 ----------------------------------------------------------------------------- The Snow Water Equivalent Percent of Median represents the snow water equivalent found at selected SNOTEL sites in or near the basin compared to the Median value for those sites on this day. The Accumulated Precipitation Percent of Average represents the total precipitation (beginning October 1st) found at selected SNOTEL sites in or near the basin compared to the Average value for those sites on this day. * = Data are not available or data may not provide a valid measure of conditions for over half of the sites within the basin. Refer to the individual state reports for a complete data listing and basin analysis. Units = inches for the Current and Normal Snow Water Equivalent and Total Precipitation values Medians and averages are calculated for the period 1981-2010. Provisional data, subject to revision. * Site -- Either: (a) the current value is missing; (b) the median or average for the day is not available or is zero; or (c) for snow water equivalent, the median for the day is less than 10% of the maximum median value for the year. * Basin - More than half of the sites within the basin are flagged with *, preventing the calculation of a meaningful basin index. The basin index is calculated as the sum of the valid current values divided by the sum of the corresponding medians (for snow water equivalent) or averages (for precipitation) and the resulting fraction multiplied by 100.