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 TUESDAY: SEPTEMBER 19 , 2017 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 * 80 SUSITNA BASIN ................................ 3 of 5 * 79 NORTHERN KENAI MOUNTAINS ..................... 7 of 7 * 91 SOUTHERN KENAI ............................... 3 of 6 * 88 COPPER BASIN ................................. 2 of 3 * 83 PRINCE WILLIAM SOUND ......................... 1 of 7 * 90 CHENA BASIN .................................. 6 of 7 * 95 UPPER TANANA ................................. 2 of 5 * * KOYUKUK BASIN ................................ 2 of 6 * 109 CENTRAL YUKON BASIN .......................... 0 of 5 * 89 NORTON SOUND ................................. 0 of 4 * 94 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 125 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * 100 ARIZONA VERDE RIVER BASIN ............................ 5 of 10 * 118 SAN FRANCISCO PEAKS .......................... 1 of 1 * 128 CENTRAL MOGOLLON RIM ......................... 2 of 4 * 114 LITTLE COLORADO - SOUTHERN HEADWATERS ........ 4 of 6 * 109 UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 6 of 9 * 96 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 6 of 8 * 91 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 3 of 5 * 129 TRUCKEE RIVER ................................ 8 of 9 * 196 LAKE TAHOE ................................... 8 of 8 * 209 CARSON RIVER ................................. 8 of 9 * 195 WALKER RIVER ................................. 7 of 7 * 201 KLAMATH ...................................... 15 of 18 * 129 COLORADO GUNNISON RIVER BASIN ......................... 11 of 16 * 102 UPPER COLORADO RIVER BASIN ................... 24 of 31 * 101 SOUTH PLATTE RIVER BASIN ..................... 17 of 22 * 109 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 9 of 12 * 107 YAMPA AND WHITE RIVER BASINS ................. 16 of 20 * 98 ARKANSAS RIVER BASIN ......................... 7 of 9 * 111 UPPER RIO GRANDE BASIN ....................... 10 of 16 * 98 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 16 of 19 * 100 IDAHO NORTHERN PANHANDLE REGION .................... 10 of 10 * 123 SPOKANE RIVER BASIN .......................... 9 of 10 * 118 CLEARWATER BASIN ............................. 14 of 16 * 109 SALMON BASIN ................................. 22 of 22 * 127 WEISER BASIN ................................. 4 of 4 * 124 PAYETTE BASIN ................................ 11 of 11 * 136 BOISE BASIN .................................. 9 of 10 * 147 BIG WOOD BASIN ............................... 8 of 9 * 156 LITTLE WOOD BASIN ............................ 5 of 5 * 160 BIG LOST BASIN ............................... 5 of 5 * 158 LITTLE LOST, BIRCH BASINS .................... 4 of 4 * 135 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 4 of 4 * 123 HENRYS FORK, TETON BASINS .................... 8 of 8 * 137 SNAKE BASIN ABOVE PALISADES .................. 18 of 18 * 142 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 * 139 SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29 * 140 RAFT BASIN ................................... 1 of 2 * 142 GOOSE CREEK BASIN ............................ 2 of 2 * 127 SALMON FALLS BASIN ........................... 5 of 5 * 126 BRUNEAU BASIN ................................ 5 of 5 * 127 OWYHEE BASIN ................................. 8 of 8 * 131 BEAR RIVER BASIN ............................. 15 of 15 * 136 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 * 115 FLATHEAD RIVER BASIN ......................... 12 of 16 * 111 UPPER CLARK FORK RIVER BASIN ................. 13 of 15 * 102 BITTERROOT RIVER BASIN ....................... 7 of 7 * 105 LOWER CLARK FORK RIVER BASIN ................. 7 of 8 * 114 JEFFERSON RIVER BASIN ........................ 19 of 19 * 106 MADISON RIVER BASIN .......................... 11 of 11 * 117 GALLATIN RIVER BASIN ......................... 7 of 7 * 110 MISSOURI HEADWATERS .......................... 31 of 31 * 110 HEADWATERS MISSOURI MAINSTEM ................. 5 of 5 * 95 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 * 88 SUN, TETON AND MARIAS RIVER BASINS ........... 4 of 6 * 101 MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21 * 92 ST. MARY AND MILK RIVER BASINS ............... 3 of 3 * 104 UPPER YELLOWSTONE RIVER BASIN ................ 23 of 24 * 120 WIND RIVER BASIN (WYOMING) ................... 11 of 13 * 148 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 * 147 BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16 * 125 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 * 114 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 * 108 LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35 * 130 NEVADA NORTHERN GREAT BASIN ......................... 6 of 9 * 134 SNAKE RIVER .................................. 7 of 10 * 127 OWYHEE RIVER ................................. 5 of 5 * * UPPER HUMBOLDT RIVER ......................... 9 of 9 * 132 LOWER HUMBOLDT RIVER ......................... 5 of 9 * 132 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 * 131 EASTERN NEVADA BASINS ........................ 4 of 4 * 109 NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 4 * 125 UPPER RIO GRANDE BASIN ....................... 8 of 9 * 93 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 8 of 11 * 101 JEMEZ RIVER BASIN ............................ 2 of 3 * 77 SAN FRANCISCO RIVER BASIN .................... 2 of 3 * 88 GILA RIVER BASIN ............................. 3 of 3 * 96 MIMBRES RIVER BASIN .......................... 2 of 2 * 86 PECOS RIVER BASIN ............................ 1 of 1 * 81 SAN JUAN RIVER HEADWATERS .................... 5 of 5 * 91 ANIMAS RIVER BASIN ........................... 7 of 7 * 102 CIMARRON RIVER BASIN ......................... 1 of 2 * 107 ZUNI/BLUEWATER RIVER BASIN ................... 1 of 1 * 110 RIO HONDO BASIN .............................. 0 of 1 * 81 CHUSKA MOUNTAINS ............................. 0 of 1 * * OREGON OWYHEE ....................................... 8 of 8 * 131 MALHEUR ...................................... 3 of 3 * 117 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 15 of 17 * 120 UMATILLA, WALLA WALLA, WILLOW ................ 7 of 8 * 115 JOHN DAY ..................................... 12 of 13 * 114 UPPER DESCHUTES, CROOKED ..................... 13 of 14 * 122 HOOD, SANDY, LOWER DESCHUTES ................. 8 of 8 * 117 COAST RANGE .................................. 1 of 2 * 135 WILLAMETTE ................................... 19 of 23 * 124 ROGUE, UMPQUA ................................ 10 of 12 * 132 KLAMATH ...................................... 15 of 18 * 129 LAKE COUNTY, GOOSE LAKE ...................... 8 of 9 * 135 HARNEY ....................................... 8 of 9 * 112 UTAH RAFT RIVER ................................... 1 of 2 * 142 BEAR RIVER ................................... 18 of 24 * 139 WEBER-OGDEN RIVERS ........................... 17 of 20 * 124 PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17 * 117 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 * 111 NORTHEASTERN UINTAHS ......................... 6 of 10 * 112 DUCHESNE RIVER ............................... 12 of 13 * 120 PRICE-SAN RAFAEL ............................. 6 of 11 * 121 DIRTY DEVIL .................................. 3 of 6 * 116 SOUTH EASTERN UTAH ........................... 3 of 6 * 96 UPPER SEVIER RIVER ........................... 12 of 17 * 107 SAN PITCH RIVER .............................. 5 of 11 * * LOWER SEVIER RIVER ........................... 1 of 3 * * BEAVER RIVER ................................. 2 of 2 * 117 ESCALANTE RIVER .............................. 3 of 4 * 102 SOUTHWESTERN UTAH ............................ 10 of 13 * 114 WASHINGTON NORTHERN PANHANDLE ........................... 10 of 10 * 123 SPOKANE ...................................... 9 of 10 * 118 UPPER COLUMBIA ............................... 2 of 6 * 118 CENTRAL COLUMBIA ............................. 6 of 8 * 114 UPPER YAKIMA ................................. 3 of 5 * 100 LOWER YAKIMA ................................. 6 of 9 * 124 LOWER SNAKE .................................. 20 of 22 * 112 LOWER COLUMBIA ............................... 17 of 22 * 128 SOUTH PUGET SOUND ............................ 6 of 10 * 102 CENTRAL PUGET SOUND .......................... 8 of 9 * 104 NORTH PUGET SOUND ............................ 7 of 12 * 112 OLYMPIC ...................................... 3 of 4 * 131 WYOMING SNAKE RIVER .................................. 20 of 20 * 141 MADISON-GALLATIN ............................. 5 of 5 * 125 YELLOWSTONE .................................. 13 of 13 * 127 WIND RIVER ................................... 10 of 12 * 148 BIGHORN BASIN ................................ 10 of 11 * 110 SHOSHONE RIVER ............................... 4 of 5 * 148 POWDER RIVER ................................. 6 of 7 * 108 TONGUE RIVER ................................. 6 of 7 * 114 BELLE FOURCHE ................................ 1 of 1 * 97 CHEYENNE RIVER BASIN ......................... 2 of 2 * 91 UPPER N. PLATTE .............................. 11 of 18 * 104 SWEETWATER ................................... 3 of 3 * 149 LOWER N. PLATTE .............................. 4 of 4 * 99 LARAMIE RIVER ................................ 5 of 6 * 99 S. PLATTE .................................... 1 of 3 * 99 LITTLE SNAKE RIVER ........................... 7 of 8 * 100 UPPER GREEN RIVER ............................ 12 of 13 * 148 LOWER GREEN RIVER ............................ 6 of 11 * 128 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.