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 MONDAY: AUGUST 20 , 2018 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 * 93 SUSITNA BASIN ................................ 3 of 5 * 132 NORTHERN KENAI MOUNTAINS ..................... 6 of 7 * 94 SOUTHERN KENAI ............................... 3 of 6 * 102 COPPER BASIN ................................. 2 of 3 * 132 PRINCE WILLIAM SOUND ......................... 1 of 7 * 107 CHENA BASIN .................................. 6 of 7 * 132 UPPER TANANA ................................. 2 of 4 * * KOYUKUK BASIN ................................ 2 of 6 * 113 CENTRAL YUKON BASIN .......................... 0 of 5 * 110 NORTON SOUND ................................. 0 of 4 * 127 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 123 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * 89 ARIZONA VERDE RIVER BASIN ............................ 3 of 10 * 54 SAN FRANCISCO PEAKS .......................... 1 of 1 * 66 CENTRAL MOGOLLON RIM ......................... 3 of 4 * 42 LITTLE COLORADO - SOUTHERN HEADWATERS ........ 5 of 6 * 48 UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 7 of 9 * 50 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 * 51 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 4 of 5 * 85 TRUCKEE RIVER ................................ 7 of 9 * 91 LAKE TAHOE ................................... 7 of 8 * 97 CARSON RIVER ................................. 9 of 9 * 87 WALKER RIVER ................................. 7 of 7 * 94 KLAMATH ...................................... 14 of 18 * 79 COLORADO GUNNISON RIVER BASIN ......................... 12 of 16 * 56 UPPER COLORADO RIVER BASIN ................... 26 of 31 * 75 SOUTH PLATTE RIVER BASIN ..................... 16 of 22 * 86 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 11 of 12 * 89 YAMPA AND WHITE RIVER BASINS ................. 17 of 20 * 74 ARKANSAS RIVER BASIN ......................... 7 of 9 * 62 UPPER RIO GRANDE BASIN ....................... 10 of 16 * 52 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 17 of 19 * 48 IDAHO NORTHERN PANHANDLE REGION .................... 10 of 10 * 106 SPOKANE RIVER BASIN .......................... 10 of 10 * 105 CLEARWATER BASIN ............................. 14 of 16 * 110 SALMON BASIN ................................. 22 of 22 * 99 WEISER BASIN ................................. 4 of 4 * 86 PAYETTE BASIN ................................ 10 of 11 * 89 BOISE BASIN .................................. 8 of 10 * 90 BIG WOOD BASIN ............................... 8 of 9 * 91 LITTLE WOOD BASIN ............................ 5 of 5 * 95 BIG LOST BASIN ............................... 5 of 5 * 101 LITTLE LOST, BIRCH BASINS .................... 4 of 4 * 105 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 4 of 4 * 102 HENRYS FORK, TETON BASINS .................... 8 of 8 * 104 SNAKE BASIN ABOVE PALISADES .................. 14 of 18 * 105 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 5 of 6 * 89 SNAKE BASIN ABOVE AMERICAN FALLS ............. 24 of 29 * 102 RAFT BASIN ................................... 1 of 2 * 82 GOOSE CREEK BASIN ............................ 2 of 2 * 77 SALMON FALLS BASIN ........................... 5 of 5 * 85 BRUNEAU BASIN ................................ 5 of 5 * 89 OWYHEE BASIN ................................. 8 of 8 * 84 BEAR RIVER BASIN ............................. 13 of 15 * 79 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 * 101 FLATHEAD RIVER BASIN ......................... 11 of 16 * 112 UPPER CLARK FORK RIVER BASIN ................. 10 of 15 * 123 BITTERROOT RIVER BASIN ....................... 6 of 7 * 112 LOWER CLARK FORK RIVER BASIN ................. 8 of 8 * 107 JEFFERSON RIVER BASIN ........................ 18 of 19 * 110 MADISON RIVER BASIN .......................... 10 of 11 * 106 GALLATIN RIVER BASIN ......................... 7 of 7 * 116 MISSOURI HEADWATERS .......................... 29 of 31 * 111 HEADWATERS MISSOURI MAINSTEM ................. 4 of 5 * 120 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 * 110 SUN, TETON AND MARIAS RIVER BASINS ........... 3 of 6 * 121 MISSOURI MAINSTEM RIVER BASIN ................ 16 of 21 * 113 ST. MARY AND MILK RIVER BASINS ............... 3 of 3 * 99 UPPER YELLOWSTONE RIVER BASIN ................ 21 of 24 * 122 WIND RIVER BASIN (WYOMING) ................... 10 of 13 * 99 SHOSHONE RIVER BASIN (WYOMING) ............... 4 of 6 * 127 BIGHORN RIVER BASIN (WYOMING) ................ 14 of 16 * 108 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 * 96 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 * 95 LOWER YELLOWSTONE RIVER BASIN ................ 29 of 35 * 102 NEVADA NORTHERN GREAT BASIN ......................... 7 of 9 * 86 SNAKE RIVER .................................. 7 of 10 * 85 OWYHEE RIVER ................................. 5 of 5 * 84 UPPER HUMBOLDT RIVER ......................... 9 of 9 * 81 LOWER HUMBOLDT RIVER ......................... 5 of 9 * 84 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 * 79 EASTERN NEVADA BASINS ........................ 4 of 4 * 71 NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 4 * 50 UPPER RIO GRANDE BASIN ....................... 9 of 9 * 50 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 7 of 11 * 52 JEMEZ RIVER BASIN ............................ 2 of 3 * 38 SAN FRANCISCO RIVER BASIN .................... 3 of 3 * 49 GILA RIVER BASIN ............................. 3 of 3 * 53 MIMBRES RIVER BASIN .......................... 2 of 2 * 54 PECOS RIVER BASIN ............................ 1 of 1 * 52 SAN JUAN RIVER HEADWATERS .................... 5 of 5 * 47 ANIMAS RIVER BASIN ........................... 7 of 7 * 47 CIMARRON RIVER BASIN ......................... 1 of 2 * 45 ZUNI/BLUEWATER RIVER BASIN ................... 0 of 1 * 31 RIO HONDO BASIN .............................. 0 of 1 * 76 CHUSKA MOUNTAINS ............................. 0 of 1 * * OREGON OWYHEE ....................................... 8 of 8 * 84 MALHEUR ...................................... 3 of 3 * 81 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 14 of 17 * 98 UMATILLA, WALLA WALLA, WILLOW ................ 6 of 8 * 100 JOHN DAY ..................................... 13 of 13 * 85 UPPER DESCHUTES, CROOKED ..................... 14 of 14 * 80 HOOD, SANDY, LOWER DESCHUTES ................. 7 of 8 * 94 COAST RANGE .................................. 1 of 2 * 97 WILLAMETTE ................................... 18 of 23 * 86 ROGUE, UMPQUA ................................ 12 of 12 * 77 KLAMATH ...................................... 14 of 18 * 79 LAKE COUNTY, GOOSE LAKE ...................... 9 of 9 * 87 HARNEY ....................................... 9 of 9 * 78 UTAH RAFT RIVER ................................... 1 of 2 * 82 BEAR RIVER ................................... 16 of 24 * 79 WEBER-OGDEN RIVERS ........................... 17 of 20 * 62 PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17 * 65 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 * 60 NORTHEASTERN UINTAHS ......................... 6 of 10 * 74 DUCHESNE RIVER ............................... 12 of 13 * 61 PRICE-SAN RAFAEL ............................. 6 of 11 * 63 DIRTY DEVIL .................................. 3 of 6 * 70 SOUTH EASTERN UTAH ........................... 3 of 6 * 52 UPPER SEVIER RIVER ........................... 12 of 17 * 69 SAN PITCH RIVER .............................. 5 of 11 * * LOWER SEVIER RIVER ........................... 1 of 3 * * BEAVER RIVER ................................. 2 of 2 * 66 ESCALANTE RIVER .............................. 3 of 4 * 68 SOUTHWESTERN UTAH ............................ 10 of 13 * 68 WASHINGTON NORTHERN PANHANDLE ........................... 10 of 10 * 106 SPOKANE ...................................... 10 of 10 * 105 UPPER COLUMBIA ............................... 5 of 6 * 104 CENTRAL COLUMBIA ............................. 4 of 8 * 110 UPPER YAKIMA ................................. 3 of 5 * 104 LOWER YAKIMA ................................. 7 of 9 * 100 LOWER SNAKE .................................. 20 of 22 * 107 LOWER COLUMBIA ............................... 16 of 22 * 97 SOUTH PUGET SOUND ............................ 6 of 10 * 107 CENTRAL PUGET SOUND .......................... 7 of 9 * 114 NORTH PUGET SOUND ............................ 7 of 12 * 110 OLYMPIC ...................................... 2 of 4 * * WYOMING SNAKE RIVER .................................. 16 of 20 * 105 MADISON-GALLATIN ............................. 4 of 5 * 108 YELLOWSTONE .................................. 12 of 13 * 123 WIND RIVER ................................... 10 of 12 * 99 BIGHORN BASIN ................................ 10 of 11 * 96 SHOSHONE RIVER ............................... 3 of 5 * 130 POWDER RIVER ................................. 6 of 7 * 95 TONGUE RIVER ................................. 6 of 7 * 96 BELLE FOURCHE ................................ 1 of 1 * * CHEYENNE RIVER BASIN ......................... 2 of 2 * 89 UPPER N. PLATTE .............................. 15 of 18 * 82 SWEETWATER ................................... 3 of 3 * 68 LOWER N. PLATTE .............................. 4 of 4 * 79 LARAMIE RIVER ................................ 6 of 6 * 92 S. PLATTE .................................... 2 of 3 * 98 LITTLE SNAKE RIVER ........................... 6 of 8 * 68 UPPER GREEN RIVER ............................ 6 of 13 * 106 LOWER GREEN RIVER ............................ 7 of 11 * 80 UPPER BEAR RIVER ............................. 7 of 9 * 72 ----------------------------------------------------------------------------- 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.