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 WEDNESDAY: OCTOBER 18 , 2017 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 23* 103 SUSITNA BASIN ................................ 3 of 5 121* 135 NORTHERN KENAI MOUNTAINS ..................... 7 of 7 120* 101 SOUTHERN KENAI ............................... 3 of 6 * 87 COPPER BASIN ................................. 2 of 3 600* 102 PRINCE WILLIAM SOUND ......................... 1 of 7 * 107 CHENA BASIN .................................. 5 of 7 204* 288 UPPER TANANA ................................. 2 of 5 * * KOYUKUK BASIN ................................ 2 of 6 * 108 CENTRAL YUKON BASIN .......................... 0 of 5 * 380 NORTON SOUND ................................. 0 of 4 * 331 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 178 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * * ARIZONA VERDE RIVER BASIN ............................ 5 of 10 * * SAN FRANCISCO PEAKS .......................... 1 of 1 * 0 CENTRAL MOGOLLON RIM ......................... 3 of 4 * 0 LITTLE COLORADO - SOUTHERN HEADWATERS ........ 5 of 6 * * UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 6 of 9 * 5 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 6 of 8 * 14 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 3 of 5 * 10 TRUCKEE RIVER ................................ 8 of 9 * 12 LAKE TAHOE ................................... 8 of 8 * 10 CARSON RIVER ................................. 8 of 9 * 9 WALKER RIVER ................................. 7 of 7 * 42 KLAMATH ...................................... 16 of 18 * 50 COLORADO GUNNISON RIVER BASIN ......................... 11 of 16 200* 47 UPPER COLORADO RIVER BASIN ................... 25 of 31 316* 141 SOUTH PLATTE RIVER BASIN ..................... 17 of 22 240* 168 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12 295* 166 YAMPA AND WHITE RIVER BASINS ................. 18 of 20 568* 139 ARKANSAS RIVER BASIN ......................... 7 of 9 223* 89 UPPER RIO GRANDE BASIN ....................... 11 of 16 25* 37 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 16 of 19 50* 11 IDAHO NORTHERN PANHANDLE REGION .................... 10 of 10 1150* 52 SPOKANE RIVER BASIN .......................... 10 of 10 3300* 119 CLEARWATER BASIN ............................. 15 of 16 4625* 143 SALMON BASIN ................................. 22 of 22 557* 91 WEISER BASIN ................................. 4 of 4 * 92 PAYETTE BASIN ................................ 11 of 11 * 96 BOISE BASIN .................................. 8 of 10 1000* 95 BIG WOOD BASIN ............................... 7 of 9 * 88 LITTLE WOOD BASIN ............................ 5 of 5 450* 86 BIG LOST BASIN ............................... 5 of 5 567* 79 LITTLE LOST, BIRCH BASINS .................... 4 of 4 400* 66 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 4 of 4 300* 66 HENRYS FORK, TETON BASINS .................... 8 of 8 278* 73 SNAKE BASIN ABOVE PALISADES .................. 18 of 18 340* 74 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 6 of 6 * 59 SNAKE BASIN ABOVE AMERICAN FALLS ............. 29 of 29 312* 70 RAFT BASIN ................................... 1 of 2 * 78 GOOSE CREEK BASIN ............................ 2 of 2 * 73 SALMON FALLS BASIN ........................... 5 of 5 * 90 BRUNEAU BASIN ................................ 5 of 5 * 89 OWYHEE BASIN ................................. 8 of 8 * 92 BEAR RIVER BASIN ............................. 14 of 15 480* 45 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 325* 65 FLATHEAD RIVER BASIN ......................... 12 of 16 419* 116 UPPER CLARK FORK RIVER BASIN ................. 13 of 15 400* 124 BITTERROOT RIVER BASIN ....................... 7 of 7 650* 108 LOWER CLARK FORK RIVER BASIN ................. 8 of 8 2400* 119 JEFFERSON RIVER BASIN ........................ 18 of 19 345* 83 MADISON RIVER BASIN .......................... 11 of 11 249* 73 GALLATIN RIVER BASIN ......................... 7 of 7 205* 75 MISSOURI HEADWATERS .......................... 30 of 31 282* 77 HEADWATERS MISSOURI MAINSTEM ................. 4 of 5 350* 126 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 288* 107 SUN, TETON AND MARIAS RIVER BASINS ........... 4 of 6 700* 126 MISSOURI MAINSTEM RIVER BASIN ................ 17 of 21 318* 128 ST. MARY AND MILK RIVER BASINS ............... 3 of 3 283* 144 UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24 257* 73 WIND RIVER BASIN (WYOMING) ................... 11 of 13 292* 108 SHOSHONE RIVER BASIN (WYOMING) ............... 5 of 6 305* 89 BIGHORN RIVER BASIN (WYOMING) ................ 15 of 16 225* 88 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 87* 62 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 195* 94 LOWER YELLOWSTONE RIVER BASIN ................ 30 of 35 214* 88 NEVADA NORTHERN GREAT BASIN ......................... 6 of 9 * 25 SNAKE RIVER .................................. 7 of 10 * 84 OWYHEE RIVER ................................. 5 of 5 * 106 UPPER HUMBOLDT RIVER ......................... 9 of 9 * 73 LOWER HUMBOLDT RIVER ......................... 5 of 9 * 44 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 * 62 EASTERN NEVADA BASINS ........................ 4 of 4 * 29 NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 4 * 60 UPPER RIO GRANDE BASIN ....................... 8 of 9 21* 25 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 8 of 11 * 104 JEMEZ RIVER BASIN ............................ 2 of 3 * 63 SAN FRANCISCO RIVER BASIN .................... 2 of 3 * 24 GILA RIVER BASIN ............................. 3 of 3 * 10 MIMBRES RIVER BASIN .......................... 2 of 2 * 8 PECOS RIVER BASIN ............................ 1 of 1 * 114 SAN JUAN RIVER HEADWATERS .................... 5 of 5 21* 5 ANIMAS RIVER BASIN ........................... 7 of 7 80* * CIMARRON RIVER BASIN ......................... 1 of 2 * 67 ZUNI/BLUEWATER RIVER BASIN ................... 1 of 1 * 12 RIO HONDO BASIN .............................. 1 of 1 * 48 CHUSKA MOUNTAINS ............................. 0 of 1 * * OREGON OWYHEE ....................................... 8 of 8 * 92 MALHEUR ...................................... 3 of 3 * 256 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17 * 163 UMATILLA, WALLA WALLA, WILLOW ................ 7 of 8 * 196 JOHN DAY ..................................... 13 of 13 * 174 UPPER DESCHUTES, CROOKED ..................... 9 of 14 * 172 HOOD, SANDY, LOWER DESCHUTES ................. 5 of 8 * 159 COAST RANGE .................................. 0 of 2 * 60 WILLAMETTE ................................... 13 of 23 * 168 ROGUE, UMPQUA ................................ 11 of 12 * 66 KLAMATH ...................................... 16 of 18 * 50 LAKE COUNTY, GOOSE LAKE ...................... 8 of 9 * 15 HARNEY ....................................... 8 of 9 * 156 UTAH RAFT RIVER ................................... 1 of 2 * 78 BEAR RIVER ................................... 17 of 24 480* 43 WEBER-OGDEN RIVERS ........................... 17 of 20 60* 29 PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17 150* 34 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 * 39 NORTHEASTERN UINTAHS ......................... 6 of 10 140* 71 DUCHESNE RIVER ............................... 12 of 13 120* 29 PRICE-SAN RAFAEL ............................. 6 of 11 * 37 DIRTY DEVIL .................................. 3 of 6 * 31 SOUTH EASTERN UTAH ........................... 3 of 6 * 24 UPPER SEVIER RIVER ........................... 12 of 17 700* 22 SAN PITCH RIVER .............................. 5 of 11 * * LOWER SEVIER RIVER ........................... 1 of 3 * * BEAVER RIVER ................................. 2 of 2 0* 17 ESCALANTE RIVER .............................. 3 of 4 * 9 SOUTHWESTERN UTAH ............................ 10 of 13 * 5 WASHINGTON NORTHERN PANHANDLE ........................... 10 of 10 1150* 52 SPOKANE ...................................... 10 of 10 3300* 119 UPPER COLUMBIA ............................... 4 of 6 * 21 CENTRAL COLUMBIA ............................. 6 of 8 * 75 UPPER YAKIMA ................................. 4 of 5 * 110 LOWER YAKIMA ................................. 7 of 9 * 99 LOWER SNAKE .................................. 21 of 22 5000* 147 LOWER COLUMBIA ............................... 15 of 22 * 99 SOUTH PUGET SOUND ............................ 6 of 10 * 113 CENTRAL PUGET SOUND .......................... 9 of 9 * 112 NORTH PUGET SOUND ............................ 7 of 12 * 77 OLYMPIC ...................................... 3 of 4 * 40 WYOMING SNAKE RIVER .................................. 20 of 20 286* 76 MADISON-GALLATIN ............................. 5 of 5 185* 57 YELLOWSTONE .................................. 13 of 13 273* 74 WIND RIVER ................................... 10 of 12 300* 112 BIGHORN BASIN ................................ 10 of 11 183* 88 SHOSHONE RIVER ............................... 4 of 5 277* 92 POWDER RIVER ................................. 6 of 7 195* 94 TONGUE RIVER ................................. 6 of 7 87* 62 BELLE FOURCHE ................................ 1 of 1 * 62 CHEYENNE RIVER BASIN ......................... 2 of 2 * 81 UPPER N. PLATTE .............................. 14 of 18 224* 126 SWEETWATER ................................... 3 of 3 62* 61 LOWER N. PLATTE .............................. 4 of 4 450* 94 LARAMIE RIVER ................................ 6 of 6 371* 179 S. PLATTE .................................... 2 of 3 311* 181 LITTLE SNAKE RIVER ........................... 7 of 8 200* 127 UPPER GREEN RIVER ............................ 12 of 13 273* 55 LOWER GREEN RIVER ............................ 7 of 11 108* 59 UPPER BEAR RIVER ............................. 7 of 9 100* 40 ----------------------------------------------------------------------------- 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.