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 SATURDAY: MARCH 27 , 2021 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 110 94 SUSITNA BASIN ................................ 3 of 5 118 92 NORTHERN KENAI MOUNTAINS ..................... 7 of 7 118 98 SOUTHERN KENAI ............................... 3 of 6 144 102 COPPER BASIN ................................. 2 of 3 114 96 PRINCE WILLIAM SOUND ......................... 1 of 7 * 96 CHENA BASIN .................................. 5 of 7 120 102 UPPER TANANA ................................. 2 of 4 88 * KOYUKUK BASIN ................................ 2 of 6 * 64 CENTRAL YUKON BASIN .......................... 0 of 5 * * NORTON SOUND ................................. 0 of 4 * 86 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 60 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * 113 ARIZONA VERDE RIVER BASIN ............................ 5 of 10 236* 58 SAN FRANCISCO PEAKS .......................... 1 of 1 92 79 CENTRAL MOGOLLON RIM ......................... 3 of 4 79 50 LITTLE COLORADO RIVER BASIN .................. 7 of 11 63 57 SALT RIVER BASIN ............................. 9 of 10 20 47 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 26* 48 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 7 of 8 100 83 TRUCKEE RIVER ................................ 11 of 12 71 57 LAKE TAHOE ................................... 11 of 11 73 58 CARSON RIVER ................................. 12 of 12 80 63 WALKER RIVER ................................. 7 of 7 68 64 COLORADO GUNNISON RIVER BASIN ......................... 13 of 16 92 79 UPPER COLORADO RIVER BASIN ................... 31 of 35 91 83 SOUTH PLATTE RIVER BASIN ..................... 17 of 22 103 97 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12 99 93 YAMPA AND WHITE RIVER BASINS ................. 20 of 22 92 82 ARKANSAS RIVER BASIN ......................... 9 of 11 111 97 UPPER RIO GRANDE BASIN ....................... 13 of 19 112 90 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 19 of 21 90 74 IDAHO NORTHERN PANHANDLE REGION .................... 8 of 10 90 86 COEUR D'ALENE-ST. JOE RIVER BASIN ............ 7 of 7 103 90 CLEARWATER BASIN ............................. 14 of 16 108 99 SALMON BASIN ................................. 20 of 20 93 84 WEISER BASIN ................................. 4 of 4 97 84 PAYETTE BASIN ................................ 12 of 12 97 83 BOISE BASIN .................................. 9 of 10 93 85 BIG WOOD BASIN ............................... 7 of 8 80 70 LITTLE WOOD BASIN ............................ 4 of 4 66 64 BIG LOST BASIN ............................... 5 of 5 69 63 LITTLE LOST, BIRCH BASINS .................... 4 of 4 83 78 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 2 of 2 73 68 HENRYS FORK, TETON BASINS .................... 8 of 8 93 88 SNAKE BASIN ABOVE PALISADES .................. 21 of 21 93 85 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 86 79 SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29 92 84 RAFT BASIN ................................... 1 of 2 105 88 GOOSE CREEK BASIN ............................ 2 of 2 96 85 SALMON FALLS BASIN ........................... 4 of 6 100 91 BRUNEAU BASIN ................................ 5 of 8 97 93 OWYHEE BASIN ................................. 7 of 12 85 77 BEAR RIVER BASIN ............................. 17 of 22 81 78 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 83 93 FLATHEAD RIVER BASIN ......................... 11 of 17 94 101 UPPER CLARK FORK RIVER BASIN ................. 12 of 14 101 98 BITTERROOT RIVER BASIN ....................... 7 of 8 105 107 LOWER CLARK FORK RIVER BASIN ................. 9 of 9 93 87 JEFFERSON RIVER BASIN ........................ 19 of 20 95 92 MADISON RIVER BASIN .......................... 12 of 12 91 91 GALLATIN RIVER BASIN ......................... 7 of 7 99 104 MISSOURI HEADWATERS .......................... 31 of 31 95 94 HELENA VALLEY ................................ 3 of 4 102 101 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 8 of 9 98 89 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 92 101 MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21 98 98 ST. MARYS RIVER BASIN ........................ 2 of 2 101 101 MILK RIVER BASIN ............................. 1 of 1 110 135 UPPER YELLOWSTONE RIVER BASIN ................ 21 of 22 104 105 WIND RIVER BASIN (WYOMING) ................... 11 of 13 94 95 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 98 107 BIGHORN RIVER BASIN (WYOMING) ................ 23 of 26 98 97 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 108 108 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 119 109 LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35 101 101 NEVADA NORTHERN GREAT BASIN ......................... 7 of 8 100 83 SNAKE RIVER .................................. 7 of 11 97 90 OWYHEE RIVER ................................. 5 of 10 90 79 UPPER HUMBOLDT RIVER ......................... 9 of 16 96 83 LOWER HUMBOLDT RIVER ......................... 5 of 10 115 92 CLOVER VALLEY & FRANKLIN RIVER ............... 5 of 6 94 84 EASTERN NEVADA BASINS ........................ 4 of 14 * * NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 5 91 83 UPPER RIO GRANDE BASIN - New Mexico .......... 6 of 11 75 78 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 9 of 11 98 89 JEMEZ RIVER BASIN ............................ 3 of 4 66 74 SAN FRANCISCO RIVER BASIN .................... 5 of 6 26 48 GILA RIVER BASIN ............................. 3 of 3 53* 54 MIMBRES RIVER BASIN .......................... 2 of 2 * 51 PECOS RIVER BASIN ............................ 3 of 3 61 62 SAN JUAN RIVER BASIN ......................... 12 of 13 92 75 ANIMAS RIVER BASIN ........................... 7 of 7 88 69 CANADIAN RIVER BASIN ......................... 4 of 6 92 92 ZUNI/BLUEWATER RIVER BASIN ................... 1 of 1 1100* 70 RIO HONDO BASIN .............................. 1 of 1 6 56 CHUSKA MOUNTAINS ............................. 0 of 2 * * OREGON OWYHEE ....................................... 7 of 12 85 77 MALHEUR ...................................... 3 of 3 110 86 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 17 of 19 131 103 UMATILLA, WALLA WALLA, WILLOW ................ 9 of 10 148 108 JOHN DAY ..................................... 13 of 13 129 93 UPPER DESCHUTES, CROOKED ..................... 13 of 14 110 91 HOOD, SANDY, LOWER DESCHUTES ................. 9 of 9 134 106 COAST RANGE .................................. 1 of 2 * 101 WILLAMETTE ................................... 18 of 23 121 96 ROGUE, UMPQUA ................................ 12 of 13 97 81 KLAMATH ...................................... 16 of 20 85 72 LAKE COUNTY, GOOSE LAKE ...................... 6 of 7 79 66 HARNEY ....................................... 11 of 12 119 88 UTAH RAFT RIVER ................................... 1 of 2 105 88 BEAR RIVER ................................... 19 of 25 81 76 WEBER-OGDEN RIVERS ........................... 17 of 22 76 69 PROVO R.-UTAH LAKE-JORDAN R. ................. 18 of 24 82 73 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 92 75 NORTHEASTERN UINTAHS ......................... 7 of 12 102 92 DUCHESNE RIVER ............................... 13 of 15 79 69 PRICE-SAN RAFAEL ............................. 7 of 14 75 70 DIRTY DEVIL .................................. 6 of 11 93 80 SOUTH EASTERN UTAH ........................... 4 of 10 * * UPPER SEVIER RIVER ........................... 14 of 23 84 73 SAN PITCH RIVER .............................. 6 of 12 81 73 LOWER SEVIER RIVER ........................... 2 of 5 * * BEAVER RIVER ................................. 3 of 3 88 79 ESCALANTE RIVER .............................. 4 of 5 91 64 SOUTHWESTERN UTAH ............................ 10 of 13 69 61 WASHINGTON SPOKANE ...................................... 9 of 9 105 92 LOWER PEND OREILLE ........................... 5 of 5 93 85 UPPER COLUMBIA ............................... 6 of 9 119 * CENTRAL COLUMBIA ............................. 8 of 11 117 106 UPPER YAKIMA ................................. 3 of 7 * 105 NACHES ....................................... 5 of 8 122 106 LOWER YAKIMA ................................. 2 of 4 110 92 KLICKITAT .................................... 2 of 4 133 88 LOWER SNAKE, WALLA WALLA ..................... 12 of 14 132 106 LOWER COLUMBIA ............................... 10 of 17 140 103 SOUTH PUGET SOUND ............................ 8 of 14 141* 114 CENTRAL PUGET SOUND .......................... 8 of 9 153 117 NORTH PUGET SOUND ............................ 8 of 13 121 105 OLYMPIC ...................................... 2 of 4 162 91 WYOMING SNAKE RIVER .................................. 22 of 22 94 86 MADISON HEADWATERS IN WYOMING ................ 5 of 5 93 87 YELLOWSTONE HEADWATERS IN WYOMING ............ 12 of 12 104 103 WIND RIVER ................................... 9 of 11 92 94 BIGHORN BASIN ................................ 10 of 11 105 93 SHOSHONE RIVER ............................... 5 of 6 98 107 POWDER RIVER ................................. 6 of 7 119 109 TONGUE RIVER ................................. 6 of 7 108 108 BELLE FOURCHE ................................ 3 of 3 74 80 CHEYENNE RIVER BASIN ......................... 2 of 2 75 80 UPPER N. PLATTE .............................. 18 of 20 98 92 SWEETWATER ................................... 3 of 3 79 82 LOWER N. PLATTE .............................. 4 of 4 120 107 LARAMIE RIVER ................................ 7 of 7 115 108 S. PLATTE .................................... 1 of 1 80 102 LITTLE SNAKE RIVER ........................... 8 of 9 99 88 UPPER GREEN RIVER ............................ 14 of 15 87 83 LOWER GREEN RIVER ............................ 7 of 12 101 96 UPPER BEAR RIVER ............................. 11 of 13 83 79 ----------------------------------------------------------------------------- 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.