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 TUESDAY: AUGUST 11 , 2020 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 * 101 SUSITNA BASIN ................................ 3 of 5 * 120 NORTHERN KENAI MOUNTAINS ..................... 7 of 7 * 92 SOUTHERN KENAI ............................... 3 of 6 * 109 COPPER BASIN ................................. 2 of 3 * 96 PRINCE WILLIAM SOUND ......................... 1 of 7 * 98 CHENA BASIN .................................. 5 of 7 * 162 UPPER TANANA ................................. 2 of 4 * * KOYUKUK BASIN ................................ 2 of 6 * 110 CENTRAL YUKON BASIN .......................... 0 of 5 * * NORTON SOUND ................................. 0 of 4 * 115 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 85 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * 127 ARIZONA VERDE RIVER BASIN ............................ 5 of 10 * 94 SAN FRANCISCO PEAKS .......................... 1 of 1 * 89 CENTRAL MOGOLLON RIM ......................... 2 of 4 * 102 LITTLE COLORADO - SOUTHERN HEADWATERS ........ 2 of 6 * 97 UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 4 of 9 * 87 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 * 87 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 7 of 8 * 80 TRUCKEE RIVER ................................ 10 of 12 * 66 LAKE TAHOE ................................... 10 of 11 * 65 CARSON RIVER ................................. 11 of 12 * 71 WALKER RIVER ................................. 7 of 7 * 61 COLORADO GUNNISON RIVER BASIN ......................... 11 of 16 * 72 UPPER COLORADO RIVER BASIN ................... 24 of 31 * 81 SOUTH PLATTE RIVER BASIN ..................... 15 of 22 * 91 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 10 of 12 * 93 YAMPA AND WHITE RIVER BASINS ................. 17 of 20 * * ARKANSAS RIVER BASIN ......................... 7 of 9 * 76 UPPER RIO GRANDE BASIN ....................... 9 of 16 * 66 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 16 of 19 * 71 IDAHO NORTHERN PANHANDLE REGION .................... 10 of 10 * 101 SPOKANE RIVER BASIN .......................... 8 of 10 * 92 CLEARWATER BASIN ............................. 15 of 16 * 94 SALMON BASIN ................................. 16 of 22 * 92 WEISER BASIN ................................. 3 of 4 * 89 PAYETTE BASIN ................................ 6 of 11 * 86 BOISE BASIN .................................. 5 of 10 * 82 BIG WOOD BASIN ............................... 6 of 9 * 72 LITTLE WOOD BASIN ............................ 5 of 5 * 62 BIG LOST BASIN ............................... 5 of 5 * 66 LITTLE LOST, BIRCH BASINS .................... 3 of 4 * 80 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 3 of 4 * 88 HENRYS FORK, TETON BASINS .................... 7 of 8 * 93 SNAKE BASIN ABOVE PALISADES .................. 16 of 18 * 98 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 4 of 6 * 97 SNAKE BASIN ABOVE AMERICAN FALLS ............. 25 of 29 * 97 RAFT BASIN ................................... 1 of 2 * * GOOSE CREEK BASIN ............................ 2 of 2 * 96 SALMON FALLS BASIN ........................... 5 of 6 * 95 BRUNEAU BASIN ................................ 5 of 6 * 97 OWYHEE BASIN ................................. 7 of 8 * 92 BEAR RIVER BASIN ............................. 14 of 15 * 92 MONTANA KOOTENAI RIVER BASIN ......................... 7 of 8 * 91 FLATHEAD RIVER BASIN ......................... 11 of 15 * 101 UPPER CLARK FORK RIVER BASIN ................. 12 of 14 * 103 BITTERROOT RIVER BASIN ....................... 8 of 8 * 102 LOWER CLARK FORK RIVER BASIN ................. 8 of 9 * 92 JEFFERSON RIVER BASIN ........................ 18 of 20 * 97 MADISON RIVER BASIN .......................... 12 of 12 * 89 GALLATIN RIVER BASIN ......................... 7 of 7 * 100 MISSOURI HEADWATERS .......................... 30 of 31 * 95 HEADWATERS MISSOURI MAINSTEM ................. 4 of 4 * 98 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 7 of 9 * 101 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 * 99 MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21 * 99 ST. MARY RIVER BASINS ........................ 1 of 2 * 101 UPPER YELLOWSTONE RIVER BASIN ................ 21 of 23 * 96 WIND RIVER BASIN (WYOMING) ................... 11 of 13 * 80 SHOSHONE RIVER BASIN (WYOMING) ............... 4 of 6 * 100 BIGHORN RIVER BASIN (WYOMING) ................ 22 of 26 * 85 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 * 81 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 * 82 LOWER YELLOWSTONE RIVER BASIN ................ 29 of 35 * 84 NEVADA NORTHERN GREAT BASIN ......................... 7 of 8 * 80 SNAKE RIVER .................................. 7 of 11 * 96 OWYHEE RIVER ................................. 5 of 5 * 89 UPPER HUMBOLDT RIVER ......................... 9 of 9 * 77 LOWER HUMBOLDT RIVER ......................... 5 of 10 * 74 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 * 68 EASTERN NEVADA BASINS ........................ 4 of 4 * * NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 4 * 66 UPPER RIO GRANDE BASIN ....................... 8 of 9 * 64 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 7 of 11 * 63 JEMEZ RIVER BASIN ............................ 2 of 3 * 54 SAN FRANCISCO RIVER BASIN .................... 3 of 3 * 83 GILA RIVER BASIN ............................. 3 of 3 * 85 MIMBRES RIVER BASIN .......................... 2 of 2 * 88 PECOS RIVER BASIN ............................ 1 of 1 * 11 SAN JUAN RIVER HEADWATERS .................... 5 of 5 * 66 ANIMAS RIVER BASIN ........................... 7 of 7 * 77 CIMARRON RIVER BASIN ......................... 0 of 2 * 95 ZUNI/BLUEWATER RIVER BASIN ................... 0 of 1 * 82 RIO HONDO BASIN .............................. 1 of 1 * * CHUSKA MOUNTAINS ............................. 0 of 1 * * OREGON OWYHEE ....................................... 7 of 8 * 92 MALHEUR ...................................... 3 of 3 * 86 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 12 of 17 * 104 UMATILLA, WALLA WALLA, WILLOW ................ 6 of 8 * 103 JOHN DAY ..................................... 12 of 13 * 88 UPPER DESCHUTES, CROOKED ..................... 13 of 14 * 77 HOOD, SANDY, LOWER DESCHUTES ................. 7 of 8 * 89 COAST RANGE .................................. 1 of 2 * 87 WILLAMETTE ................................... 17 of 23 * 79 ROGUE, UMPQUA ................................ 12 of 12 * 72 KLAMATH ...................................... 16 of 18 * 68 LAKE COUNTY, GOOSE LAKE ...................... 9 of 9 * 69 HARNEY ....................................... 9 of 9 * 85 UTAH RAFT RIVER ................................... 1 of 2 * * BEAR RIVER ................................... 17 of 24 * 91 WEBER-OGDEN RIVERS ........................... 17 of 20 * 81 PROVO R.-UTAH LAKE-JORDAN R. ................. 14 of 17 * 78 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 * 62 NORTHEASTERN UINTAHS ......................... 6 of 10 * * DUCHESNE RIVER ............................... 12 of 13 * 79 PRICE-SAN RAFAEL ............................. 6 of 11 * 79 DIRTY DEVIL .................................. 2 of 6 * 81 SOUTH EASTERN UTAH ........................... 3 of 7 * * UPPER SEVIER RIVER ........................... 11 of 17 * 79 SAN PITCH RIVER .............................. 5 of 11 * * LOWER SEVIER RIVER ........................... 1 of 3 * * BEAVER RIVER ................................. 1 of 2 * 70 ESCALANTE RIVER .............................. 2 of 4 * 83 SOUTHWESTERN UTAH ............................ 10 of 13 * 81 WASHINGTON NORTHERN PANHANDLE ........................... 10 of 10 * 101 SPOKANE ...................................... 8 of 10 * 92 UPPER COLUMBIA ............................... 5 of 6 * 91 CENTRAL COLUMBIA ............................. 7 of 8 * 90 UPPER YAKIMA ................................. 4 of 5 * 98 LOWER YAKIMA ................................. 7 of 9 * 89 LOWER SNAKE .................................. 20 of 22 * 97 LOWER COLUMBIA ............................... 17 of 22 * 92 SOUTH PUGET SOUND ............................ 7 of 10 * 102 CENTRAL PUGET SOUND .......................... 9 of 9 * 114 NORTH PUGET SOUND ............................ 7 of 12 * 98 OLYMPIC ...................................... 3 of 4 * 81 WYOMING SNAKE RIVER .................................. 18 of 20 * 98 MADISON-GALLATIN ............................. 5 of 5 * 83 YELLOWSTONE .................................. 13 of 14 * 97 WIND RIVER ................................... 10 of 12 * 77 BIGHORN BASIN ................................ 10 of 11 * 82 SHOSHONE RIVER ............................... 4 of 6 * 100 POWDER RIVER ................................. 6 of 7 * 82 TONGUE RIVER ................................. 6 of 7 * 81 BELLE FOURCHE ................................ 2 of 2 * 85 CHEYENNE RIVER BASIN ......................... 2 of 2 * 67 UPPER N. PLATTE .............................. 16 of 19 * * SWEETWATER ................................... 3 of 3 * 67 LOWER N. PLATTE .............................. 4 of 4 * * LARAMIE RIVER ................................ 6 of 7 * * S. PLATTE .................................... 1 of 3 * * LITTLE SNAKE RIVER ........................... 7 of 8 * * UPPER GREEN RIVER ............................ 12 of 14 * 95 LOWER GREEN RIVER ............................ 7 of 11 * 93 UPPER BEAR RIVER ............................. 8 of 10 * 87 ----------------------------------------------------------------------------- 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.