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: AUGUST 17 , 2017 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 * 72 SUSITNA BASIN ................................ 3 of 5 * 70 NORTHERN KENAI MOUNTAINS ..................... 6 of 7 * 81 SOUTHERN KENAI ............................... 3 of 6 * 75 COPPER BASIN ................................. 2 of 3 * 70 PRINCE WILLIAM SOUND ......................... 1 of 7 * 76 CHENA BASIN .................................. 6 of 7 * 100 UPPER TANANA ................................. 2 of 5 * * KOYUKUK BASIN ................................ 2 of 6 * 94 CENTRAL YUKON BASIN .......................... 0 of 5 * 86 NORTON SOUND ................................. 0 of 4 * 90 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 100 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * 93 ARIZONA VERDE RIVER BASIN ............................ 4 of 10 * 125 SAN FRANCISCO PEAKS .......................... 1 of 1 * 134 CENTRAL MOGOLLON RIM ......................... 3 of 4 * 122 LITTLE COLORADO - SOUTHERN HEADWATERS ........ 5 of 6 * 119 UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 7 of 9 * 107 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 * 101 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 3 of 5 * 130 TRUCKEE RIVER ................................ 8 of 9 * 196 LAKE TAHOE ................................... 8 of 8 * 208 CARSON RIVER ................................. 8 of 9 * 191 WALKER RIVER ................................. 6 of 7 * 209 KLAMATH ...................................... 16 of 18 * 130 COLORADO GUNNISON RIVER BASIN ......................... 9 of 16 * 106 UPPER COLORADO RIVER BASIN ................... 24 of 31 * 105 SOUTH PLATTE RIVER BASIN ..................... 16 of 22 * 113 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 9 of 12 * 110 YAMPA AND WHITE RIVER BASINS ................. 16 of 20 * 100 ARKANSAS RIVER BASIN ......................... 6 of 9 * 117 UPPER RIO GRANDE BASIN ....................... 8 of 16 * 106 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 16 of 19 * 107 IDAHO NORTHERN PANHANDLE REGION .................... 10 of 10 * 126 SPOKANE RIVER BASIN .......................... 10 of 10 * 120 CLEARWATER BASIN ............................. 14 of 16 * 112 SALMON BASIN ................................. 21 of 22 * 131 WEISER BASIN ................................. 4 of 4 * 127 PAYETTE BASIN ................................ 11 of 11 * 137 BOISE BASIN .................................. 9 of 10 * 149 BIG WOOD BASIN ............................... 8 of 9 * 157 LITTLE WOOD BASIN ............................ 5 of 5 * 160 BIG LOST BASIN ............................... 5 of 5 * 157 LITTLE LOST, BIRCH BASINS .................... 3 of 4 * 133 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 3 of 4 * 122 HENRYS FORK, TETON BASINS .................... 8 of 8 * 138 SNAKE BASIN ABOVE PALISADES .................. 17 of 18 * 144 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 * 141 SNAKE BASIN ABOVE AMERICAN FALLS ............. 28 of 29 * 142 RAFT BASIN ................................... 1 of 2 * 144 GOOSE CREEK BASIN ............................ 2 of 2 * 128 SALMON FALLS BASIN ........................... 5 of 5 * 125 BRUNEAU BASIN ................................ 5 of 5 * 127 OWYHEE BASIN ................................. 8 of 8 * 128 BEAR RIVER BASIN ............................. 15 of 15 * 139 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 * 119 FLATHEAD RIVER BASIN ......................... 13 of 16 * 115 UPPER CLARK FORK RIVER BASIN ................. 13 of 15 * 105 BITTERROOT RIVER BASIN ....................... 7 of 7 * 110 LOWER CLARK FORK RIVER BASIN ................. 8 of 8 * 118 JEFFERSON RIVER BASIN ........................ 19 of 19 * 105 MADISON RIVER BASIN .......................... 11 of 11 * 117 GALLATIN RIVER BASIN ......................... 7 of 7 * 109 MISSOURI HEADWATERS .......................... 31 of 31 * 109 HEADWATERS MISSOURI MAINSTEM ................. 5 of 5 * 94 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 * 89 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 * 106 MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21 * 95 ST. MARY AND MILK RIVER BASINS ............... 3 of 3 * 110 UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24 * 121 WIND RIVER BASIN (WYOMING) ................... 11 of 13 * 152 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 * 148 BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16 * 126 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 * 115 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 * 110 LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35 * 132 NEVADA NORTHERN GREAT BASIN ......................... 6 of 9 * 137 SNAKE RIVER .................................. 7 of 10 * 128 OWYHEE RIVER ................................. 5 of 5 * 129 UPPER HUMBOLDT RIVER ......................... 9 of 9 * 133 LOWER HUMBOLDT RIVER ......................... 5 of 9 * 135 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 * 131 EASTERN NEVADA BASINS ........................ 4 of 4 * 108 NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 4 * 124 UPPER RIO GRANDE BASIN ....................... 7 of 9 * 103 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 8 of 11 * 103 JEMEZ RIVER BASIN ............................ 2 of 3 * 83 SAN FRANCISCO RIVER BASIN .................... 3 of 3 * 99 GILA RIVER BASIN ............................. 3 of 3 * 105 MIMBRES RIVER BASIN .......................... 2 of 2 * 98 PECOS RIVER BASIN ............................ 1 of 1 * 81 SAN JUAN RIVER HEADWATERS .................... 5 of 5 * 98 ANIMAS RIVER BASIN ........................... 7 of 7 * 108 CIMARRON RIVER BASIN ......................... 1 of 2 * 109 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 * 121 UMATILLA, WALLA WALLA, WILLOW ................ 6 of 8 * 116 JOHN DAY ..................................... 13 of 13 * 118 UPPER DESCHUTES, CROOKED ..................... 14 of 14 * 124 HOOD, SANDY, LOWER DESCHUTES ................. 8 of 8 * 118 COAST RANGE .................................. 1 of 2 * 136 WILLAMETTE ................................... 18 of 23 * 124 ROGUE, UMPQUA ................................ 11 of 12 * 133 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 * 142 WEBER-OGDEN RIVERS ........................... 17 of 20 * 126 PROVO R.-UTAH LAKE-JORDAN R. ................. 13 of 17 * 118 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 * 112 NORTHEASTERN UINTAHS ......................... 5 of 10 * 116 DUCHESNE RIVER ............................... 12 of 13 * 126 PRICE-SAN RAFAEL ............................. 6 of 11 * 122 DIRTY DEVIL .................................. 3 of 6 * 116 SOUTH EASTERN UTAH ........................... 3 of 6 * 99 UPPER SEVIER RIVER ........................... 12 of 17 * 108 SAN PITCH RIVER .............................. 5 of 11 * * LOWER SEVIER RIVER ........................... 1 of 3 * * BEAVER RIVER ................................. 2 of 2 * 116 ESCALANTE RIVER .............................. 3 of 4 * 104 SOUTHWESTERN UTAH ............................ 10 of 13 * 114 WASHINGTON NORTHERN PANHANDLE ........................... 10 of 10 * 126 SPOKANE ...................................... 10 of 10 * 120 UPPER COLUMBIA ............................... 4 of 6 * 123 CENTRAL COLUMBIA ............................. 6 of 8 * 118 UPPER YAKIMA ................................. 4 of 5 * 102 LOWER YAKIMA ................................. 6 of 9 * 126 LOWER SNAKE .................................. 20 of 22 * 114 LOWER COLUMBIA ............................... 15 of 22 * 129 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 * 142 MADISON-GALLATIN ............................. 5 of 5 * 126 YELLOWSTONE .................................. 12 of 13 * 128 WIND RIVER ................................... 10 of 12 * 152 BIGHORN BASIN ................................ 10 of 11 * 111 SHOSHONE RIVER ............................... 4 of 5 * 151 POWDER RIVER ................................. 6 of 7 * 110 TONGUE RIVER ................................. 6 of 7 * 115 BELLE FOURCHE ................................ 1 of 1 * 93 CHEYENNE RIVER BASIN ......................... 2 of 2 * 90 UPPER N. PLATTE .............................. 11 of 18 * 110 SWEETWATER ................................... 3 of 3 * 157 LOWER N. PLATTE .............................. 4 of 4 * 103 LARAMIE RIVER ................................ 5 of 6 * 103 S. PLATTE .................................... 1 of 3 * 102 LITTLE SNAKE RIVER ........................... 7 of 8 * 102 UPPER GREEN RIVER ............................ 12 of 13 * 150 LOWER GREEN RIVER ............................ 6 of 11 * 133 UPPER BEAR RIVER ............................. 7 of 9 * 132 ----------------------------------------------------------------------------- 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.