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 FRIDAY: MAY 29 , 2020 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 11 100 SUSITNA BASIN ................................ 3 of 5 567* 163 NORTHERN KENAI MOUNTAINS ..................... 7 of 7 0* 88 SOUTHERN KENAI ............................... 3 of 6 * 113 COPPER BASIN ................................. 2 of 3 * 99 PRINCE WILLIAM SOUND ......................... 1 of 7 * 101 CHENA BASIN .................................. 6 of 7 * 175 UPPER TANANA ................................. 2 of 4 * * KOYUKUK BASIN ................................ 2 of 6 * 130 CENTRAL YUKON BASIN .......................... 0 of 5 * 153 NORTON SOUND ................................. 0 of 4 * 120 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 86 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * 114 ARIZONA VERDE RIVER BASIN ............................ 5 of 10 * 108 SAN FRANCISCO PEAKS .......................... 1 of 1 * 100 CENTRAL MOGOLLON RIM ......................... 3 of 4 * 104 LITTLE COLORADO - SOUTHERN HEADWATERS ........ 5 of 6 * 100 UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 7 of 9 * 99 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 * 100 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 7 of 8 40* 75 TRUCKEE RIVER ................................ 10 of 12 26* 66 LAKE TAHOE ................................... 10 of 11 0* 66 CARSON RIVER ................................. 11 of 12 3* 69 WALKER RIVER ................................. 7 of 7 45* 59 COLORADO GUNNISON RIVER BASIN ......................... 11 of 16 37* 72 UPPER COLORADO RIVER BASIN ................... 27 of 31 83* 87 SOUTH PLATTE RIVER BASIN ..................... 17 of 22 82* 97 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12 72 99 YAMPA AND WHITE RIVER BASINS ................. 18 of 20 78* 94 ARKANSAS RIVER BASIN ......................... 6 of 9 78* 74 UPPER RIO GRANDE BASIN ....................... 10 of 16 3* 64 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 17 of 19 13* 68 IDAHO NORTHERN PANHANDLE REGION .................... 9 of 10 133 100 SPOKANE RIVER BASIN .......................... 7 of 10 124* 93 CLEARWATER BASIN ............................. 15 of 16 109 93 SALMON BASIN ................................. 22 of 22 69 86 WEISER BASIN ................................. 4 of 4 * 81 PAYETTE BASIN ................................ 10 of 11 49* 81 BOISE BASIN .................................. 9 of 10 52* 76 BIG WOOD BASIN ............................... 8 of 9 50* 66 LITTLE WOOD BASIN ............................ 5 of 5 7* 62 BIG LOST BASIN ............................... 5 of 5 4* 65 LITTLE LOST, BIRCH BASINS .................... 4 of 4 26* 78 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 4 of 4 26* 86 HENRYS FORK, TETON BASINS .................... 8 of 8 94 92 SNAKE BASIN ABOVE PALISADES .................. 16 of 18 127* 97 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 * 90 SNAKE BASIN ABOVE AMERICAN FALLS ............. 27 of 29 111* 94 RAFT BASIN ................................... 1 of 2 * 87 GOOSE CREEK BASIN ............................ 2 of 2 * 92 SALMON FALLS BASIN ........................... 5 of 6 11* 91 BRUNEAU BASIN ................................ 5 of 6 11* 92 OWYHEE BASIN ................................. 7 of 8 * 84 BEAR RIVER BASIN ............................. 15 of 15 59* 88 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 136 93 FLATHEAD RIVER BASIN ......................... 12 of 16 133* 101 UPPER CLARK FORK RIVER BASIN ................. 12 of 15 92 95 BITTERROOT RIVER BASIN ....................... 7 of 7 69* 95 LOWER CLARK FORK RIVER BASIN ................. 7 of 8 151 92 JEFFERSON RIVER BASIN ........................ 19 of 19 78 90 MADISON RIVER BASIN .......................... 10 of 11 84 87 GALLATIN RIVER BASIN ......................... 7 of 7 109 102 MISSOURI HEADWATERS .......................... 30 of 31 87 91 HEADWATERS MISSOURI MAINSTEM ................. 5 of 5 74 93 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 135* 102 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 122* 96 MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21 118* 99 ST. MARY AND MILK RIVER BASINS ............... 3 of 3 143* 103 UPPER YELLOWSTONE RIVER BASIN ................ 23 of 24 108 102 WIND RIVER BASIN (WYOMING) ................... 11 of 13 52* 81 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 94 107 BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16 93 94 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 80* 79 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 62* 86 LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35 82* 87 NEVADA NORTHERN GREAT BASIN ......................... 7 of 8 40* 75 SNAKE RIVER .................................. 7 of 11 11* 92 OWYHEE RIVER ................................. 5 of 5 * 83 UPPER HUMBOLDT RIVER ......................... 9 of 9 5* 74 LOWER HUMBOLDT RIVER ......................... 5 of 10 0* 70 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 * 67 EASTERN NEVADA BASINS ........................ 4 of 4 0* 67 NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 4 * 63 UPPER RIO GRANDE BASIN ....................... 9 of 9 2* 62 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 8 of 11 17* 76 JEMEZ RIVER BASIN ............................ 2 of 3 * 64 SAN FRANCISCO RIVER BASIN .................... 3 of 3 * 101 GILA RIVER BASIN ............................. 3 of 3 * 95 MIMBRES RIVER BASIN .......................... 2 of 2 * 108 PECOS RIVER BASIN ............................ 1 of 1 * 70 SAN JUAN RIVER HEADWATERS .................... 5 of 5 1 63 ANIMAS RIVER BASIN ........................... 7 of 7 34* 75 CIMARRON RIVER BASIN ......................... 1 of 2 * 76 ZUNI/BLUEWATER RIVER BASIN ................... 1 of 1 * 88 RIO HONDO BASIN .............................. 1 of 1 * 128 CHUSKA MOUNTAINS ............................. 0 of 1 * * OREGON OWYHEE ....................................... 7 of 8 * 84 MALHEUR ...................................... 3 of 3 * 87 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 13 of 17 112* 102 UMATILLA, WALLA WALLA, WILLOW ................ 5 of 8 * 103 JOHN DAY ..................................... 10 of 13 * 88 UPPER DESCHUTES, CROOKED ..................... 13 of 14 37* 77 HOOD, SANDY, LOWER DESCHUTES ................. 7 of 8 60* 86 COAST RANGE .................................. 1 of 2 * 86 WILLAMETTE ................................... 18 of 23 37* 78 ROGUE, UMPQUA ................................ 11 of 12 34* 69 KLAMATH ...................................... 15 of 18 5* 67 LAKE COUNTY, GOOSE LAKE ...................... 8 of 9 62* 68 HARNEY ....................................... 9 of 9 72* 84 UTAH RAFT RIVER ................................... 1 of 2 * 87 BEAR RIVER ................................... 17 of 24 65* 87 WEBER-OGDEN RIVERS ........................... 16 of 20 18* 81 PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17 47* 76 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 133* 67 NORTHEASTERN UINTAHS ......................... 6 of 10 36* 92 DUCHESNE RIVER ............................... 11 of 13 31* 78 PRICE-SAN RAFAEL ............................. 6 of 11 367* 79 DIRTY DEVIL .................................. 2 of 6 * 86 SOUTH EASTERN UTAH ........................... 3 of 7 * * UPPER SEVIER RIVER ........................... 12 of 17 43* 82 SAN PITCH RIVER .............................. 4 of 11 * * LOWER SEVIER RIVER ........................... 1 of 3 * * BEAVER RIVER ................................. 1 of 2 19 78 ESCALANTE RIVER .............................. 3 of 4 * 86 SOUTHWESTERN UTAH ............................ 10 of 13 189* 91 WASHINGTON NORTHERN PANHANDLE ........................... 9 of 10 133 100 SPOKANE ...................................... 7 of 10 124* 93 UPPER COLUMBIA ............................... 4 of 6 97* 90 CENTRAL COLUMBIA ............................. 7 of 8 56* 92 UPPER YAKIMA ................................. 4 of 5 53* 98 LOWER YAKIMA ................................. 6 of 9 44* 90 LOWER SNAKE .................................. 20 of 22 109 95 LOWER COLUMBIA ............................... 16 of 22 95* 90 SOUTH PUGET SOUND ............................ 7 of 10 95* 106 CENTRAL PUGET SOUND .......................... 7 of 9 85* 115 NORTH PUGET SOUND ............................ 7 of 12 83 97 OLYMPIC ...................................... 3 of 4 88 77 WYOMING SNAKE RIVER .................................. 18 of 20 109 97 MADISON-GALLATIN ............................. 4 of 5 89* 83 YELLOWSTONE .................................. 14 of 14 113 103 WIND RIVER ................................... 10 of 12 61* 79 BIGHORN BASIN ................................ 10 of 11 93* 85 SHOSHONE RIVER ............................... 5 of 6 94 107 POWDER RIVER ................................. 6 of 7 62* 86 TONGUE RIVER ................................. 6 of 7 80* 79 BELLE FOURCHE ................................ 1 of 2 * 84 CHEYENNE RIVER BASIN ......................... 1 of 2 * 66 UPPER N. PLATTE .............................. 15 of 19 92* 99 SWEETWATER ................................... 3 of 3 3* 65 LOWER N. PLATTE .............................. 3 of 4 * 86 LARAMIE RIVER ................................ 6 of 7 78 100 S. PLATTE .................................... 2 of 3 46* 95 LITTLE SNAKE RIVER ........................... 7 of 8 77* 94 UPPER GREEN RIVER ............................ 12 of 14 113* 87 LOWER GREEN RIVER ............................ 7 of 11 45* 88 UPPER BEAR RIVER ............................. 8 of 10 70* 85 ----------------------------------------------------------------------------- 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.