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: AUGUST 20 , 2017 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 * 73 SUSITNA BASIN ................................ 3 of 5 * 72 NORTHERN KENAI MOUNTAINS ..................... 6 of 7 * 81 SOUTHERN KENAI ............................... 3 of 6 * 75 COPPER BASIN ................................. 2 of 3 * 71 PRINCE WILLIAM SOUND ......................... 1 of 7 * 76 CHENA BASIN .................................. 6 of 7 * 101 UPPER TANANA ................................. 2 of 5 * * KOYUKUK BASIN ................................ 2 of 6 * 94 CENTRAL YUKON BASIN .......................... 0 of 5 * 88 NORTON SOUND ................................. 0 of 4 * 91 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 101 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * 95 ARIZONA VERDE RIVER BASIN ............................ 4 of 10 * 124 SAN FRANCISCO PEAKS .......................... 1 of 1 * 132 CENTRAL MOGOLLON RIM ......................... 3 of 4 * 120 LITTLE COLORADO - SOUTHERN HEADWATERS ........ 5 of 6 * 117 UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 6 of 9 * 106 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 6 of 8 * 100 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 3 of 5 * 130 TRUCKEE RIVER ................................ 8 of 9 * 197 LAKE TAHOE ................................... 8 of 8 * 208 CARSON RIVER ................................. 8 of 9 * 192 WALKER RIVER ................................. 7 of 7 * 201 KLAMATH ...................................... 16 of 18 * 130 COLORADO GUNNISON RIVER BASIN ......................... 9 of 16 * 105 UPPER COLORADO RIVER BASIN ................... 24 of 31 * 104 SOUTH PLATTE RIVER BASIN ..................... 16 of 22 * 112 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 9 of 12 * 109 YAMPA AND WHITE RIVER BASINS ................. 16 of 20 * 100 ARKANSAS RIVER BASIN ......................... 6 of 9 * 116 UPPER RIO GRANDE BASIN ....................... 9 of 16 * 105 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 16 of 19 * 106 IDAHO NORTHERN PANHANDLE REGION .................... 10 of 10 * 127 SPOKANE RIVER BASIN .......................... 10 of 10 * 120 CLEARWATER BASIN ............................. 14 of 16 * 112 SALMON BASIN ................................. 21 of 22 * 130 WEISER BASIN ................................. 4 of 4 * 126 PAYETTE BASIN ................................ 10 of 11 * 137 BOISE BASIN .................................. 8 of 10 * 149 BIG WOOD BASIN ............................... 8 of 9 * 157 LITTLE WOOD BASIN ............................ 5 of 5 * 160 BIG LOST BASIN ............................... 5 of 5 * 156 LITTLE LOST, BIRCH BASINS .................... 3 of 4 * 133 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 3 of 4 * 121 HENRYS FORK, TETON BASINS .................... 8 of 8 * 135 SNAKE BASIN ABOVE PALISADES .................. 17 of 18 * 143 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 * 140 SNAKE BASIN ABOVE AMERICAN FALLS ............. 28 of 29 * 140 RAFT BASIN ................................... 1 of 2 * 144 GOOSE CREEK BASIN ............................ 2 of 2 * 127 SALMON FALLS BASIN ........................... 5 of 5 * 125 BRUNEAU BASIN ................................ 5 of 5 * 125 OWYHEE BASIN ................................. 8 of 8 * 128 BEAR RIVER BASIN ............................. 15 of 15 * 138 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 * 118 FLATHEAD RIVER BASIN ......................... 13 of 16 * 114 UPPER CLARK FORK RIVER BASIN ................. 13 of 15 * 104 BITTERROOT RIVER BASIN ....................... 7 of 7 * 109 LOWER CLARK FORK RIVER BASIN ................. 8 of 8 * 117 JEFFERSON RIVER BASIN ........................ 19 of 19 * 106 MADISON RIVER BASIN .......................... 11 of 11 * 116 GALLATIN RIVER BASIN ......................... 7 of 7 * 108 MISSOURI HEADWATERS .......................... 31 of 31 * 110 HEADWATERS MISSOURI MAINSTEM ................. 5 of 5 * 94 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 * 88 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 * 105 MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21 * 94 ST. MARY AND MILK RIVER BASINS ............... 3 of 3 * 109 UPPER YELLOWSTONE RIVER BASIN ................ 21 of 24 * 120 WIND RIVER BASIN (WYOMING) ................... 11 of 13 * 151 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 * 147 BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16 * 126 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 * 115 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 * 105 LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35 * 131 NEVADA NORTHERN GREAT BASIN ......................... 6 of 9 * 136 SNAKE RIVER .................................. 7 of 10 * 126 OWYHEE RIVER ................................. 5 of 5 * 130 UPPER HUMBOLDT RIVER ......................... 9 of 9 * 135 LOWER HUMBOLDT RIVER ......................... 5 of 9 * 135 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 * 134 EASTERN NEVADA BASINS ........................ 4 of 4 * 107 NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 4 * 123 UPPER RIO GRANDE BASIN ....................... 8 of 9 * 102 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 8 of 11 * 102 JEMEZ RIVER BASIN ............................ 2 of 3 * 83 SAN FRANCISCO RIVER BASIN .................... 2 of 3 * 98 GILA RIVER BASIN ............................. 3 of 3 * 104 MIMBRES RIVER BASIN .......................... 1 of 2 * 98 PECOS RIVER BASIN ............................ 1 of 1 * 80 SAN JUAN RIVER HEADWATERS .................... 5 of 5 * 97 ANIMAS RIVER BASIN ........................... 7 of 7 * 107 CIMARRON RIVER BASIN ......................... 1 of 2 * 108 ZUNI/BLUEWATER RIVER BASIN ................... 1 of 1 * 118 RIO HONDO BASIN .............................. 0 of 1 * 86 CHUSKA MOUNTAINS ............................. 0 of 1 * * OREGON OWYHEE ....................................... 8 of 8 * 128 MALHEUR ...................................... 3 of 3 * 120 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17 * 120 UMATILLA, WALLA WALLA, WILLOW ................ 7 of 8 * 117 JOHN DAY ..................................... 13 of 13 * 117 UPPER DESCHUTES, CROOKED ..................... 14 of 14 * 124 HOOD, SANDY, LOWER DESCHUTES ................. 6 of 8 * 112 COAST RANGE .................................. 1 of 2 * 136 WILLAMETTE ................................... 17 of 23 * 124 ROGUE, UMPQUA ................................ 11 of 12 * 132 KLAMATH ...................................... 16 of 18 * 130 LAKE COUNTY, GOOSE LAKE ...................... 8 of 9 * 136 HARNEY ....................................... 8 of 9 * 114 UTAH RAFT RIVER ................................... 1 of 2 * 144 BEAR RIVER ................................... 18 of 24 * 141 WEBER-OGDEN RIVERS ........................... 17 of 20 * 125 PROVO R.-UTAH LAKE-JORDAN R. ................. 13 of 17 * 117 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 * 112 NORTHEASTERN UINTAHS ......................... 5 of 10 * 115 DUCHESNE RIVER ............................... 12 of 13 * 125 PRICE-SAN RAFAEL ............................. 6 of 11 * 121 DIRTY DEVIL .................................. 3 of 6 * 115 SOUTH EASTERN UTAH ........................... 3 of 6 * 99 UPPER SEVIER RIVER ........................... 12 of 17 * 107 SAN PITCH RIVER .............................. 5 of 11 * * LOWER SEVIER RIVER ........................... 1 of 3 * * BEAVER RIVER ................................. 2 of 2 * 115 ESCALANTE RIVER .............................. 3 of 4 * 103 SOUTHWESTERN UTAH ............................ 10 of 13 * 113 WASHINGTON NORTHERN PANHANDLE ........................... 10 of 10 * 127 SPOKANE ...................................... 10 of 10 * 120 UPPER COLUMBIA ............................... 2 of 6 * 122 CENTRAL COLUMBIA ............................. 6 of 8 * 117 UPPER YAKIMA ................................. 4 of 5 * 102 LOWER YAKIMA ................................. 5 of 9 * 125 LOWER SNAKE .................................. 20 of 22 * 114 LOWER COLUMBIA ............................... 13 of 22 * 126 SOUTH PUGET SOUND ............................ 6 of 10 * 110 CENTRAL PUGET SOUND .......................... 7 of 9 * 106 NORTH PUGET SOUND ............................ 7 of 12 * * OLYMPIC ...................................... 2 of 4 * * WYOMING SNAKE RIVER .................................. 19 of 20 * 141 MADISON-GALLATIN ............................. 5 of 5 * 125 YELLOWSTONE .................................. 11 of 13 * 128 WIND RIVER ................................... 10 of 12 * 151 BIGHORN BASIN ................................ 10 of 11 * 111 SHOSHONE RIVER ............................... 4 of 5 * 149 POWDER RIVER ................................. 6 of 7 * 105 TONGUE RIVER ................................. 6 of 7 * 115 BELLE FOURCHE ................................ 1 of 1 * 93 CHEYENNE RIVER BASIN ......................... 2 of 2 * 89 UPPER N. PLATTE .............................. 10 of 18 * 107 SWEETWATER ................................... 3 of 3 * 156 LOWER N. PLATTE .............................. 4 of 4 * 101 LARAMIE RIVER ................................ 5 of 6 * 101 S. PLATTE .................................... 1 of 3 * 101 LITTLE SNAKE RIVER ........................... 7 of 8 * 102 UPPER GREEN RIVER ............................ 12 of 13 * 149 LOWER GREEN RIVER ............................ 6 of 11 * 132 UPPER BEAR RIVER ............................. 7 of 9 * 131 ----------------------------------------------------------------------------- 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.