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: APRIL 18 , 2019 ----------------------------------------------------------------------------- STATE PERCENT OF Normal RIVER BASIN Number Snow Water Accum of Sites Equivalent Precip ----------------------------------------------------------------------------- ALASKA ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 50 112 SUSITNA BASIN ................................ 3 of 5 88 121 NORTHERN KENAI MOUNTAINS ..................... 7 of 7 52 128 SOUTHERN KENAI ............................... 2 of 6 * 133 COPPER BASIN ................................. 1 of 3 * 115 PRINCE WILLIAM SOUND ......................... 1 of 7 * * CHENA BASIN .................................. 6 of 7 84 89 UPPER TANANA ................................. 1 of 4 * * KOYUKUK BASIN ................................ 2 of 6 * 144 CENTRAL YUKON BASIN .......................... 0 of 5 * 109 NORTON SOUND ................................. 0 of 4 * 123 KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 93 NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * * SOUTHEAST ALASKA BASIN ....................... 1 of 3 * 85 ARIZONA VERDE RIVER BASIN ............................ 5 of 10 * 133 SAN FRANCISCO PEAKS .......................... 1 of 1 161 144 CENTRAL MOGOLLON RIM ......................... 3 of 4 7* 128 LITTLE COLORADO - SOUTHERN HEADWATERS ........ 5 of 6 10* 127 UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 7 of 9 62* 120 SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 31* 102 CHUSKA MOUNTAINS ............................. 0 of 2 * * CALIFORNIA NORTHERN GREAT BASIN ......................... 3 of 5 161* 117 TRUCKEE RIVER ................................ 7 of 9 191 127 LAKE TAHOE ................................... 8 of 8 250 135 CARSON RIVER ................................. 9 of 9 201 125 WALKER RIVER ................................. 7 of 7 182 135 KLAMATH ...................................... 16 of 18 129* 108 COLORADO GUNNISON RIVER BASIN ......................... 13 of 16 148 126 UPPER COLORADO RIVER BASIN ................... 27 of 31 130 116 SOUTH PLATTE RIVER BASIN ..................... 17 of 22 115 114 LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12 119 116 YAMPA AND WHITE RIVER BASINS ................. 19 of 20 117 110 ARKANSAS RIVER BASIN ......................... 7 of 9 135 114 UPPER RIO GRANDE BASIN ....................... 11 of 16 137 118 SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASIN .................. 17 of 19 160 126 IDAHO NORTHERN PANHANDLE REGION .................... 10 of 10 90 83 SPOKANE RIVER BASIN .......................... 10 of 10 96 85 CLEARWATER BASIN ............................. 14 of 16 111 98 SALMON BASIN ................................. 21 of 22 121 108 WEISER BASIN ................................. 4 of 4 170 125 PAYETTE BASIN ................................ 11 of 11 136 116 BOISE BASIN .................................. 9 of 10 129 118 BIG WOOD BASIN ............................... 8 of 9 136 115 LITTLE WOOD BASIN ............................ 5 of 5 146 124 BIG LOST BASIN ............................... 5 of 5 136 119 LITTLE LOST, BIRCH BASINS .................... 4 of 4 121 109 MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 4 of 4 109 109 HENRYS FORK, TETON BASINS .................... 8 of 8 128 118 SNAKE BASIN ABOVE PALISADES .................. 18 of 18 122 110 WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 5 of 6 160 121 SNAKE BASIN ABOVE AMERICAN FALLS ............. 28 of 29 129 114 RAFT BASIN ................................... 0 of 2 * * GOOSE CREEK BASIN ............................ 2 of 2 151 123 SALMON FALLS BASIN ........................... 5 of 6 145 125 BRUNEAU BASIN ................................ 5 of 6 161 126 OWYHEE BASIN ................................. 7 of 8 138 113 BEAR RIVER BASIN ............................. 14 of 15 138 115 MONTANA KOOTENAI RIVER BASIN ......................... 8 of 8 90 80 FLATHEAD RIVER BASIN ......................... 13 of 16 93 90 UPPER CLARK FORK RIVER BASIN ................. 13 of 15 109 101 BITTERROOT RIVER BASIN ....................... 7 of 7 119 104 LOWER CLARK FORK RIVER BASIN ................. 8 of 8 109 89 JEFFERSON RIVER BASIN ........................ 19 of 19 111 107 MADISON RIVER BASIN .......................... 11 of 11 123 115 GALLATIN RIVER BASIN ......................... 7 of 7 120 122 MISSOURI HEADWATERS .......................... 31 of 31 117 113 HEADWATERS MISSOURI MAINSTEM ................. 5 of 5 119 112 SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 118 107 SUN, TETON AND MARIAS RIVER BASINS ........... 5 of 6 100 85 MISSOURI MAINSTEM RIVER BASIN ................ 19 of 21 112 99 ST. MARY AND MILK RIVER BASINS ............... 3 of 3 86 83 UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24 120 113 WIND RIVER BASIN (WYOMING) ................... 9 of 13 113 93 SHOSHONE RIVER BASIN (WYOMING) ............... 4 of 6 111 117 BIGHORN RIVER BASIN (WYOMING) ................ 14 of 16 98 98 TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 80 74 POWDER RIVER BASIN (WYOMING) ................. 6 of 7 87 82 LOWER YELLOWSTONE RIVER BASIN ................ 28 of 35 99 91 NEVADA NORTHERN GREAT BASIN ......................... 6 of 9 172* 116 SNAKE RIVER .................................. 7 of 11 158 125 OWYHEE RIVER ................................. 5 of 5 149 116 UPPER HUMBOLDT RIVER ......................... 9 of 9 187 130 LOWER HUMBOLDT RIVER ......................... 5 of 9 185* 120 CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 213 139 EASTERN NEVADA BASINS ........................ 4 of 4 198 143 NEW MEXICO RIO CHAMA RIVER BASIN ........................ 4 of 4 120 120 UPPER RIO GRANDE BASIN ....................... 9 of 9 132 119 SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 9 of 11 143 120 JEMEZ RIVER BASIN ............................ 3 of 3 150 116 SAN FRANCISCO RIVER BASIN .................... 3 of 3 33* 100 GILA RIVER BASIN ............................. 3 of 3 27* 84 MIMBRES RIVER BASIN .......................... 2 of 2 * 85 PECOS RIVER BASIN ............................ 1 of 1 124 121 SAN JUAN RIVER HEADWATERS .................... 5 of 5 139 121 ANIMAS RIVER BASIN ........................... 7 of 7 165 131 CIMARRON RIVER BASIN ......................... 2 of 2 395 120 ZUNI/BLUEWATER RIVER BASIN ................... 0 of 1 * 109 RIO HONDO BASIN .............................. 1 of 1 82 135 CHUSKA MOUNTAINS ............................. 0 of 1 * * OREGON OWYHEE ....................................... 7 of 8 138 113 MALHEUR ...................................... 2 of 3 194* 119 GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 16 of 17 160 117 UMATILLA, WALLA WALLA, WILLOW ................ 6 of 8 211* 121 JOHN DAY ..................................... 11 of 13 236* 120 UPPER DESCHUTES, CROOKED ..................... 13 of 14 111 100 HOOD, SANDY, LOWER DESCHUTES ................. 8 of 8 88 87 COAST RANGE .................................. 1 of 2 * 78 WILLAMETTE ................................... 19 of 23 110 95 ROGUE, UMPQUA ................................ 11 of 12 121 104 KLAMATH ...................................... 16 of 18 129* 108 LAKE COUNTY, GOOSE LAKE ...................... 8 of 9 164* 114 HARNEY ....................................... 6 of 9 150* 117 UTAH RAFT RIVER ................................... 0 of 2 * * BEAR RIVER ................................... 17 of 24 139 115 WEBER-OGDEN RIVERS ........................... 17 of 20 155 130 PROVO R.-UTAH LAKE-JORDAN R. ................. 14 of 17 169 132 TOOELE VALLEY-VERNON CREEK ................... 3 of 4 197 137 NORTHEASTERN UINTAHS ......................... 6 of 10 135 119 DUCHESNE RIVER ............................... 11 of 13 162 134 PRICE-SAN RAFAEL ............................. 6 of 11 172 138 DIRTY DEVIL .................................. 3 of 6 149 132 SOUTH EASTERN UTAH ........................... 3 of 6 267 154 UPPER SEVIER RIVER ........................... 12 of 17 173 135 SAN PITCH RIVER .............................. 5 of 11 * * LOWER SEVIER RIVER ........................... 1 of 3 * * BEAVER RIVER ................................. 2 of 2 175 149 ESCALANTE RIVER .............................. 3 of 4 149 123 SOUTHWESTERN UTAH ............................ 9 of 13 208* 138 WASHINGTON NORTHERN PANHANDLE ........................... 10 of 10 90 83 SPOKANE ...................................... 10 of 10 96 85 UPPER COLUMBIA ............................... 5 of 6 85 79 CENTRAL COLUMBIA ............................. 7 of 8 76 86 UPPER YAKIMA ................................. 4 of 5 68 82 LOWER YAKIMA ................................. 7 of 9 99 85 LOWER SNAKE .................................. 20 of 22 119 102 LOWER COLUMBIA ............................... 17 of 22 92 84 SOUTH PUGET SOUND ............................ 7 of 10 87 86 CENTRAL PUGET SOUND .......................... 9 of 9 66 88 NORTH PUGET SOUND ............................ 8 of 12 72 81 OLYMPIC ...................................... 3 of 4 81 85 WYOMING SNAKE RIVER .................................. 19 of 20 122 111 MADISON-GALLATIN ............................. 5 of 5 132 116 YELLOWSTONE .................................. 13 of 14 122 112 WIND RIVER ................................... 9 of 12 113 93 BIGHORN BASIN ................................ 10 of 11 89 82 SHOSHONE RIVER ............................... 4 of 6 111 117 POWDER RIVER ................................. 6 of 7 87 82 TONGUE RIVER ................................. 6 of 7 80 74 BELLE FOURCHE ................................ 2 of 2 96 93 CHEYENNE RIVER BASIN ......................... 2 of 2 62 68 UPPER N. PLATTE .............................. 17 of 19 118 113 SWEETWATER ................................... 3 of 3 106 86 LOWER N. PLATTE .............................. 4 of 4 125 103 LARAMIE RIVER ................................ 7 of 7 120 110 S. PLATTE .................................... 2 of 3 145 107 LITTLE SNAKE RIVER ........................... 8 of 8 125 110 UPPER GREEN RIVER ............................ 13 of 14 109 101 LOWER GREEN RIVER ............................ 7 of 11 119 105 UPPER BEAR RIVER ............................. 8 of 10 127 113 ----------------------------------------------------------------------------- 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.