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 THURSDAY: APRIL 18 , 2024 ----------------------------------------------------------------------------- STATE PERCENT OF MEDIAN RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 122 113 SUSITNA BASIN ................................ 2 of 5 135 114 NORTHERN KENAI MOUNTAINS ..................... 6 of 7 118 92 SOUTHERN KENAI ............................... 3 of 6 117 80 COPPER BASIN ................................. 2 of 3 167 138 PRINCE WILLIAM SOUND ......................... 1 of 7 152 113 CHENA BASIN .................................. 5 of 7 94 98 UPPER TANANA ................................. 2 of 4 125 131 KOYUKUK BASIN ................................ 2 of 6 114 117 CENTRAL YUKON BASIN .......................... 0 of 5 * 99 NORTON SOUND ................................. 0 of 4 * 107 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 141 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * 91 SOUTHEAST ALASKA BASIN ....................... 1 of 3 107 127 ARIZONA VERDE RIVER BASIN ............................ 9 of 10 417* 98 SAN FRANCISCO PEAKS .......................... 1 of 1 166 100 CENTRAL MOGOLLON RIM ......................... 4 of 4 300* 101 LITTLE COLORADO RIVER BASIN .................. 11 of 11 264* 100 SALT RIVER BASIN ............................. 9 of 10 * 100 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 * 112 CHUSKA MOUNTAINS ............................. 2 of 2 * 130 CALIFORNIA NORTHERN GREAT BASIN ......................... 7 of 8 152 120 TRUCKEE RIVER ................................ 11 of 12 114 96 LAKE TAHOE ................................... 11 of 11 113 95 CARSON RIVER ................................. 12 of 12 125 100 WALKER RIVER ................................. 7 of 8 111 100 COLORADO GUNNISON RIVER BASIN ......................... 15 of 16 93 99 UPPER COLORADO RIVER BASIN ................... 31 of 35 101 104 SOUTH PLATTE RIVER BASIN ..................... 21 of 22 98 98 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12 102 102 YAMPA AND WHITE RIVER BASINS ................. 20 of 22 106 109 ARKANSAS RIVER BASIN ......................... 10 of 11 95 102 UPPER RIO GRANDE BASIN ....................... 17 of 20 93 91 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 19 of 21 92 88 IDAHO NORTHERN PANHANDLE REGION .................... 10 of 10 73 87 COEUR D'ALENE-ST. JOE RIVER BASIN ............ 7 of 7 67 77 CLEARWATER BASIN ............................. 16 of 16 65 77 SALMON BASIN ................................. 20 of 20 83 88 WEISER BASIN ................................. 4 of 4 95 91 PAYETTE BASIN ................................ 12 of 12 86 90 BOISE BASIN .................................. 10 of 11 93 93 BIG WOOD BASIN ............................... 8 of 9 94 91 LITTLE WOOD BASIN ............................ 4 of 5 84 98 BIG LOST BASIN ............................... 5 of 5 90 100 LITTLE LOST .................................. 3 of 3 90 96 BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS .. 4 of 4 80 96 HENRYS FORK, TETON BASINS .................... 8 of 8 89 103 SNAKE BASIN ABOVE PALISADES .................. 21 of 21 92 98 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 7 145 121 SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29 96 103 RAFT BASIN ................................... 2 of 2 124 130 GOOSE CREEK BASIN ............................ 2 of 2 157 121 SALMON FALLS BASIN ........................... 4 of 6 138 121 BRUNEAU BASIN ................................ 5 of 8 139 119 OWYHEE BASIN ................................. 7 of 12 195 132 BEAR RIVER BASIN ............................. 21 of 21 117 113 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 75 85 FLATHEAD RIVER BASIN ......................... 14 of 17 68 81 UPPER CLARK FORK RIVER BASIN ................. 14 of 14 58 73 BITTERROOT RIVER BASIN ....................... 8 of 8 60 76 LOWER CLARK FORK RIVER BASIN ................. 9 of 9 68 75 JEFFERSON RIVER BASIN ........................ 19 of 21 72 85 MADISON RIVER BASIN .......................... 11 of 12 79 90 GALLATIN RIVER BASIN ......................... 7 of 7 70 83 MISSOURI HEADWATERS .......................... 31 of 31 74 87 HELENA VALLEY ................................ 4 of 4 51 81 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 7 of 9 66 79 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 53 68 MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21 58 77 ST. MARYS RIVER BASIN ........................ 2 of 2 74 82 MILK RIVER BASIN ............................. 1 of 1 83 94 UPPER YELLOWSTONE RIVER BASIN ................ 21 of 22 71 88 WIND RIVER BASIN (WYOMING) ................... 11 of 13 92 106 SHOSHONE RIVER BASIN (WYOMING) ............... 6 of 6 83 102 BIGHORN RIVER BASIN (WYOMING) ................ 24 of 26 87 103 TONGUE RIVER BASIN (WYOMING) ................. 7 of 7 76 101 POWDER RIVER BASIN (WYOMING) ................. 7 of 7 80 103 LOWER YELLOWSTONE RIVER BASIN ................ 33 of 35 84 104 NEVADA NORTHERN GREAT BASIN ......................... 7 of 8 152 120 SNAKE RIVER .................................. 7 of 11 145 120 OWYHEE RIVER ................................. 6 of 10 195 131 UPPER HUMBOLDT RIVER ......................... 9 of 17 149 126 LOWER HUMBOLDT RIVER ......................... 6 of 10 185 133 CLOVER VALLEY & FRANKLIN RIVER ............... 5 of 7 162 130 EASTERN NEVADA BASINS ........................ 5 of 14 126 118 SOUTHERN NEVADA - Spring Mountains ........... 3 of 3 13800* 109 NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 5 97 92 UPPER RIO GRANDE BASIN - New Mexico .......... 9 of 12 117 98 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 10 of 11 112 93 JEMEZ RIVER BASIN ............................ 3 of 4 1164* 108 SAN FRANCISCO RIVER BASIN .................... 6 of 6 * 114 GILA RIVER BASIN ............................. 2 of 3 * 112 MIMBRES RIVER BASIN .......................... 0 of 2 * 97 PECOS RIVER BASIN ............................ 3 of 3 110 94 SAN JUAN RIVER BASIN ......................... 12 of 13 88 87 ANIMAS RIVER BASIN ........................... 6 of 7 85 90 CANADIAN RIVER BASIN ......................... 6 of 7 100 84 ZUNI/BLUEWATER RIVER BASIN ................... 0 of 1 * 128 RIO HONDO BASIN .............................. 1 of 1 * 105 CHUSKA MOUNTAINS ............................. 2 of 2 * 130 OREGON OWYHEE ....................................... 7 of 12 195 132 MALHEUR ...................................... 2 of 3 86* 114 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 19 of 19 81 94 UMATILLA, WALLA WALLA, WILLOW ................ 10 of 10 80 94 JOHN DAY ..................................... 12 of 13 99 112 UPPER DESCHUTES, CROOKED ..................... 13 of 14 98 105 HOOD, SANDY, LOWER DESCHUTES ................. 8 of 10 91 96 COAST RANGE .................................. 2 of 2 * 116 WILLAMETTE ................................... 21 of 23 97 104 ROGUE, UMPQUA ................................ 11 of 13 109 100 KLAMATH ...................................... 16 of 20 104 101 LAKE COUNTY, GOOSE LAKE ...................... 6 of 7 96 103 HARNEY ....................................... 9 of 12 157* 124 UTAH RAFT RIVER ................................... 2 of 2 124 130 BEAR RIVER ................................... 25 of 26 119 113 WEBER-OGDEN RIVERS ........................... 20 of 23 133 119 PROVO R.-UTAH LAKE-JORDAN R. ................. 19 of 25 133 122 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 135 116 NORTHEASTERN UINTAHS ......................... 11 of 13 98 104 DUCHESNE RIVER ............................... 14 of 15 115 113 PRICE-SAN RAFAEL ............................. 8 of 14 119 117 DIRTY DEVIL .................................. 5 of 9 133 109 SOUTH EASTERN UTAH ........................... 5 of 11 94 97 UPPER SEVIER RIVER ........................... 17 of 23 132 101 SAN PITCH RIVER .............................. 6 of 12 125 113 LOWER SEVIER RIVER ........................... 3 of 5 174 113 BEAVER RIVER ................................. 3 of 3 120 104 ESCALANTE RIVER .............................. 4 of 5 169 110 SOUTHWESTERN UTAH ............................ 10 of 13 105 90 WASHINGTON SPOKANE ...................................... 9 of 9 66 82 LOWER PEND OREILLE ........................... 5 of 5 74 88 UPPER COLUMBIA ............................... 7 of 9 51 82 CENTRAL COLUMBIA ............................. 11 of 11 55 80 UPPER YAKIMA ................................. 7 of 7 65 78 NACHES ....................................... 8 of 8 70 80 LOWER YAKIMA ................................. 3 of 4 46 76 KLICKITAT .................................... 4 of 5 66 83 LOWER SNAKE, WALLA WALLA ..................... 14 of 14 80 92 LOWER COLUMBIA ............................... 15 of 17 84 105 SOUTH PUGET SOUND ............................ 11 of 14 64 79 CENTRAL PUGET SOUND .......................... 8 of 9 65 77 NORTH PUGET SOUND ............................ 12 of 13 57 79 OLYMPIC ...................................... 4 of 4 60 84 WYOMING SNAKE RIVER .................................. 22 of 22 92 98 MADISON HEADWATERS IN WYOMING ................ 4 of 5 84 98 YELLOWSTONE HEADWATERS IN WYOMING ............ 11 of 12 76 89 WIND RIVER ................................... 9 of 11 92 106 BIGHORN BASIN ................................ 11 of 11 94 108 SHOSHONE RIVER ............................... 6 of 6 83 102 POWDER RIVER ................................. 7 of 7 80 103 TONGUE RIVER ................................. 7 of 7 76 101 BELLE FOURCHE ................................ 3 of 3 10 82 CHEYENNE RIVER BASIN ......................... 2 of 2 13 82 UPPER N. PLATTE .............................. 19 of 20 100 103 SWEETWATER ................................... 3 of 3 92 105 LOWER N. PLATTE .............................. 4 of 4 83 100 LARAMIE RIVER ................................ 7 of 7 104 103 S. PLATTE .................................... 1 of 1 68 92 LITTLE SNAKE RIVER ........................... 8 of 9 107 106 UPPER GREEN RIVER ............................ 14 of 15 83 98 LOWER GREEN RIVER ............................ 9 of 12 101 106 UPPER BEAR RIVER ............................. 12 of 12 112 109 ----------------------------------------------------------------------------- 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 Median (or Average) Snow Water Equivalent and Total Precipitation values Medians and averages are calculated for the period 1991-2020. 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 stations for a basin with medians (or averages) report missing or invalid data The basin index is calculated as the sum of the valid current values divided by the sum of the corresponding medians or averages and the resulting fraction multiplied by 100.