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 SUNDAY: FEBRUARY 28 , 2021 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 118 98 SUSITNA BASIN ................................ 3 of 5 115 88 NORTHERN KENAI MOUNTAINS ..................... 7 of 7 121 101 SOUTHERN KENAI ............................... 3 of 6 140 105 COPPER BASIN ................................. 2 of 3 115 97 PRINCE WILLIAM SOUND ......................... 1 of 7 * * CHENA BASIN .................................. 5 of 7 113 99 UPPER TANANA ................................. 2 of 4 76 * KOYUKUK BASIN ................................ 2 of 6 * 59 CENTRAL YUKON BASIN .......................... 0 of 5 * * NORTON SOUND ................................. 0 of 4 * 77 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 63 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * * ARIZONA VERDE RIVER BASIN ............................ 5 of 10 67 50 SAN FRANCISCO PEAKS .......................... 1 of 1 74 60 CENTRAL MOGOLLON RIM ......................... 2 of 4 62 42 LITTLE COLORADO RIVER BASIN .................. 6 of 11 53 51 SALT RIVER BASIN ............................. 8 of 10 25 46 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 32 51 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 7 of 8 97 88 TRUCKEE RIVER ................................ 11 of 12 73 58 LAKE TAHOE ................................... 11 of 11 73 59 CARSON RIVER ................................. 12 of 12 74 62 WALKER RIVER ................................. 7 of 7 64 63 COLORADO GUNNISON RIVER BASIN ......................... 13 of 16 82 72 UPPER COLORADO RIVER BASIN ................... 31 of 35 86 77 SOUTH PLATTE RIVER BASIN ..................... 17 of 22 91 87 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12 93 90 YAMPA AND WHITE RIVER BASINS ................. 20 of 22 90 81 ARKANSAS RIVER BASIN ......................... 9 of 11 92 85 UPPER RIO GRANDE BASIN ....................... 13 of 19 100 85 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 19 of 21 80 68 IDAHO NORTHERN PANHANDLE REGION .................... 9 of 10 96 95 COEUR D'ALENE-ST. JOE RIVER BASIN ............ 7 of 7 105 94 CLEARWATER BASIN ............................. 15 of 16 114 103 SALMON BASIN ................................. 20 of 20 102 87 WEISER BASIN ................................. 4 of 4 107 91 PAYETTE BASIN ................................ 12 of 12 105 86 BOISE BASIN .................................. 9 of 10 99 90 BIG WOOD BASIN ............................... 7 of 8 85 73 LITTLE WOOD BASIN ............................ 4 of 4 67 65 BIG LOST BASIN ............................... 5 of 5 69 63 LITTLE LOST, BIRCH BASINS .................... 4 of 4 88 75 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 2 of 2 73 68 HENRYS FORK, TETON BASINS .................... 8 of 8 99 91 SNAKE BASIN ABOVE PALISADES .................. 21 of 21 104 92 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 93 81 SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29 100 89 RAFT BASIN ................................... 1 of 2 101 93 GOOSE CREEK BASIN ............................ 2 of 2 100 89 SALMON FALLS BASIN ........................... 4 of 6 100 93 BRUNEAU BASIN ................................ 5 of 8 93 94 OWYHEE BASIN ................................. 7 of 12 84 79 BEAR RIVER BASIN ............................. 17 of 22 86 81 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 90 102 FLATHEAD RIVER BASIN ......................... 12 of 17 104 109 UPPER CLARK FORK RIVER BASIN ................. 12 of 14 110 104 BITTERROOT RIVER BASIN ....................... 8 of 8 117 116 LOWER CLARK FORK RIVER BASIN ................. 9 of 9 95 94 JEFFERSON RIVER BASIN ........................ 19 of 20 101 96 MADISON RIVER BASIN .......................... 12 of 12 92 92 GALLATIN RIVER BASIN ......................... 7 of 7 105 108 MISSOURI HEADWATERS .......................... 31 of 31 100 97 HELENA VALLEY ................................ 4 of 4 110 110 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 8 of 9 109 98 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 107 115 MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21 109 110 ST. MARYS RIVER BASIN ........................ 2 of 2 110 108 MILK RIVER BASIN ............................. 1 of 1 125 144 UPPER YELLOWSTONE RIVER BASIN ................ 21 of 22 110 109 WIND RIVER BASIN (WYOMING) ................... 10 of 13 87 85 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 111 114 BIGHORN RIVER BASIN (WYOMING) ................ 22 of 26 97 91 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 103 102 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 100 89 LOWER YELLOWSTONE RIVER BASIN ................ 29 of 35 98 94 NEVADA NORTHERN GREAT BASIN ......................... 7 of 8 97 88 SNAKE RIVER .................................. 7 of 11 95 92 OWYHEE RIVER ................................. 5 of 10 88 81 UPPER HUMBOLDT RIVER ......................... 9 of 16 89 82 LOWER HUMBOLDT RIVER ......................... 5 of 10 107 94 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 89 77 EASTERN NEVADA BASINS ........................ 4 of 14 * * NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 5 78 77 UPPER RIO GRANDE BASIN - New Mexico .......... 5 of 11 * * SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 8 of 11 78 77 JEMEZ RIVER BASIN ............................ 3 of 4 63 72 SAN FRANCISCO RIVER BASIN .................... 5 of 6 38 50 GILA RIVER BASIN ............................. 3 of 3 53 60 MIMBRES RIVER BASIN .......................... 2 of 2 29 53 PECOS RIVER BASIN ............................ 3 of 3 43 54 SAN JUAN RIVER BASIN ......................... 12 of 13 84 69 ANIMAS RIVER BASIN ........................... 7 of 7 79 62 CANADIAN RIVER BASIN ......................... 3 of 6 72 75 ZUNI/BLUEWATER RIVER BASIN ................... 1 of 1 53 67 RIO HONDO BASIN .............................. 1 of 1 4 57 CHUSKA MOUNTAINS ............................. 0 of 2 * * OREGON OWYHEE ....................................... 7 of 12 84 79 MALHEUR ...................................... 3 of 3 119 93 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 17 of 19 131 110 UMATILLA, WALLA WALLA, WILLOW ................ 9 of 10 144 115 JOHN DAY ..................................... 13 of 13 127 100 UPPER DESCHUTES, CROOKED ..................... 13 of 14 108 96 HOOD, SANDY, LOWER DESCHUTES ................. 9 of 9 126 111 COAST RANGE .................................. 1 of 2 * 108 WILLAMETTE ................................... 18 of 23 109 102 ROGUE, UMPQUA ................................ 12 of 13 93 84 KLAMATH ...................................... 16 of 20 84 75 LAKE COUNTY, GOOSE LAKE ...................... 6 of 7 81 68 HARNEY ....................................... 11 of 12 112 94 UTAH RAFT RIVER ................................... 1 of 2 101 93 BEAR RIVER ................................... 19 of 25 85 79 WEBER-OGDEN RIVERS ........................... 17 of 22 78 68 PROVO R.-UTAH LAKE-JORDAN R. ................. 19 of 24 78 72 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 88 73 NORTHEASTERN UINTAHS ......................... 7 of 12 73 72 DUCHESNE RIVER ............................... 13 of 15 69 63 PRICE-SAN RAFAEL ............................. 7 of 14 67 64 DIRTY DEVIL .................................. 6 of 11 89 75 SOUTH EASTERN UTAH ........................... 4 of 10 * * UPPER SEVIER RIVER ........................... 14 of 23 76 67 SAN PITCH RIVER .............................. 6 of 12 76 68 LOWER SEVIER RIVER ........................... 2 of 5 * * BEAVER RIVER ................................. 3 of 3 76 71 ESCALANTE RIVER .............................. 4 of 5 72 55 SOUTHWESTERN UTAH ............................ 10 of 13 63 56 WASHINGTON SPOKANE ...................................... 9 of 9 105 97 LOWER PEND OREILLE ........................... 5 of 5 99 92 UPPER COLUMBIA ............................... 6 of 9 131 113 CENTRAL COLUMBIA ............................. 9 of 11 125 106 UPPER YAKIMA ................................. 5 of 7 128 111 NACHES ....................................... 5 of 8 129 104 LOWER YAKIMA ................................. 2 of 4 118 101 KLICKITAT .................................... 2 of 4 134 96 LOWER SNAKE, WALLA WALLA ..................... 12 of 14 133 113 LOWER COLUMBIA ............................... 11 of 17 134 108 SOUTH PUGET SOUND ............................ 9 of 14 143 117 CENTRAL PUGET SOUND .......................... 8 of 9 147 126 NORTH PUGET SOUND ............................ 8 of 13 131 109 OLYMPIC ...................................... 1 of 4 * * WYOMING SNAKE RIVER .................................. 22 of 22 104 93 MADISON HEADWATERS IN WYOMING ................ 5 of 5 93 86 YELLOWSTONE HEADWATERS IN WYOMING ............ 12 of 12 111 108 WIND RIVER ................................... 9 of 12 81 80 BIGHORN BASIN ................................ 10 of 11 97 83 SHOSHONE RIVER ............................... 5 of 6 111 114 POWDER RIVER ................................. 6 of 7 100 89 TONGUE RIVER ................................. 6 of 7 103 102 BELLE FOURCHE ................................ 3 of 3 75 82 CHEYENNE RIVER BASIN ......................... 2 of 2 78 81 UPPER N. PLATTE .............................. 18 of 20 94 90 SWEETWATER ................................... 3 of 3 69 65 LOWER N. PLATTE .............................. 4 of 4 76 75 LARAMIE RIVER ................................ 7 of 7 93 93 S. PLATTE .................................... 1 of 1 30 77 LITTLE SNAKE RIVER ........................... 8 of 9 96 87 UPPER GREEN RIVER ............................ 14 of 15 97 89 LOWER GREEN RIVER ............................ 7 of 12 93 88 UPPER BEAR RIVER ............................. 11 of 13 86 81 ----------------------------------------------------------------------------- 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.