Western US SNOTEL Snow/Precipitation Update Report
Based on Mountain Data from NRCS SNOTEL Sites
**Provisional data, subject to revision**
Data based on the first reading of the day (typically 00:00) for Tuesday, December 08, 2015
State   River Basin Snow Water Equivalent Water Year-to-Date Precipitation # of Sites Percent of Median # of Sites Percent of Median ALASKA   ANCHORAGE/SHIP CREEK BASIN 4/4 75    4/4 90      SUSITNA BASIN 2/5 166    3/5 146      NORTHERN KENAI MOUNTAINS 6/7 88    6/7 115      SOUTHERN KENAI 3/6 70    5/6 109      COPPER BASIN 2/3 106    2/3 109      PRINCE WILLIAM SOUND 1/7 142    3/7 116      CHENA BASIN 5/7 177    6/7 139      UPPER TANANA 2/4 108    2/4 117      KOYUKUK BASIN 2/6 164    4/6 104      CENTRAL YUKON BASIN 0/5 *   3/5 132      NORTON SOUND 0/4 *   2/4 165      KUPARUK-SAGAVANIRKTOK RIVER BASIN 0/3 *   3/3 67      NORTHWEST ARCTIC RIVER BASIN 0/1 *   1/1 83      SOUTHEAST ALASKA BASIN 1/3 100    2/3 131    ARIZONA   VERDE RIVER BASIN 9/10 82    8/10 180      SAN FRANCISCO PEAKS 1/1 127    1/1 178      CENTRAL MOGOLLON RIM 4/4 90    4/4 191      LITTLE COLORADO RIVER BASIN 11/11 94    11/11 185      SALT RIVER BASIN 9/10 61    8/10 162      SAN FRANCISCO / UPPER GILA RIVER BASIN 8/8 23    7/8 129      CHUSKA MOUNTAINS 2/2 168    2/2 146    CALIFORNIA   NORTHERN GREAT BASIN 7/8 116    7/8 110      TRUCKEE RIVER 11/12 99    11/12 103      LAKE TAHOE 11/11 100    11/11 100      CARSON RIVER 12/12 115    12/12 117      WALKER RIVER 7/8 96    7/8 112    COLORADO   GUNNISON RIVER BASIN 15/16 99    15/16 99      UPPER COLORADO RIVER BASIN 32/35 101    32/35 100      SOUTH PLATTE RIVER BASIN 21/22 109    21/22 114      LARAMIE AND NORTH PLATTE RIVER BASINS 12/12 81    12/12 84      YAMPA AND WHITE RIVER BASINS 20/22 75    21/22 73      ARKANSAS RIVER BASIN 11/11 112    11/11 113      UPPER RIO GRANDE BASIN 17/20 114    18/20 112      SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS 20/21 105    20/21 119    IDAHO   NORTHERN PANHANDLE REGION 10/10 103    9/10 116      COEUR D'ALENE-ST. JOE RIVER BASIN 7/7 86    7/7 84      CLEARWATER BASIN 16/16 89    15/16 96      SALMON BASIN 20/20 114    20/20 102      WEISER BASIN 4/4 153    4/4 120      PAYETTE BASIN 12/12 128    12/12 107      BOISE BASIN 10/11 113    10/11 104      BIG WOOD BASIN 8/9 113    8/9 98      LITTLE WOOD BASIN 4/5 94    4/5 94      BIG LOST BASIN 5/5 93    5/5 90      LITTLE LOST 3/3 97    3/3 98      BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS 4/4 110    4/4 101      HENRYS FORK, TETON BASINS 8/8 81    8/8 91      SNAKE BASIN ABOVE PALISADES 21/21 80    21/21 86      WILLOW, BLACKFOOT, PORTNEUF BASINS 6/7 94    6/7 104      SNAKE BASIN ABOVE AMERICAN FALLS 29/29 82    29/29 90      RAFT BASIN 2/2 86    2/2 87      GOOSE CREEK BASIN 2/2 137    2/2 106      SALMON FALLS BASIN 4/6 148    4/6 138      BRUNEAU BASIN 5/8 172    5/8 157      OWYHEE BASIN 8/12 170    9/12 134      BEAR RIVER BASIN 21/21 79    21/21 79    MONTANA   KOOTENAI RIVER BASIN 8/8 94    8/8 106      FLATHEAD RIVER BASIN 14/17 71    14/17 81      UPPER CLARK FORK RIVER BASIN 14/14 72    14/14 93      BITTERROOT RIVER BASIN 8/8 93    8/8 93      LOWER CLARK FORK RIVER BASIN 9/9 85    9/9 92      JEFFERSON RIVER BASIN 19/21 99    19/21 96      MADISON RIVER BASIN 11/12 83    11/12 90      GALLATIN RIVER BASIN 7/7 76    7/7 93      MISSOURI HEADWATERS 31/31 91    31/31 94      HELENA VALLEY 4/4 83    4/4 83      SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS 7/9 70    7/9 78      SUN, TETON AND MARIAS RIVER BASINS 5/6 65    5/6 75      MISSOURI MAINSTEM RIVER BASIN 18/21 71    18/21 79      ST. MARYS RIVER BASIN 2/2 81    2/2 93      MILK RIVER BASIN 1/1 100    1/1 102      UPPER YELLOWSTONE RIVER BASIN 21/22 76    21/22 91      WIND RIVER BASIN (WYOMING) 11/13 72    11/13 78      SHOSHONE RIVER BASIN (WYOMING) 6/6 75    6/6 93      BIGHORN RIVER BASIN (WYOMING) 24/26 65    24/26 77      TONGUE RIVER BASIN (WYOMING) 7/7 46    7/7 53      POWDER RIVER BASIN (WYOMING) 7/7 48    7/7 53      LOWER YELLOWSTONE RIVER BASIN 33/35 61    33/35 72    NEVADA   NORTHERN GREAT BASIN 7/8 116    7/8 110      SNAKE RIVER 7/11 161    7/11 141      OWYHEE RIVER 6/10 179    7/10 134      UPPER HUMBOLDT RIVER 9/17 145    10/17 136      LOWER HUMBOLDT RIVER 6/10 153    7/10 139      CLOVER VALLEY & FRANKLIN RIVER 5/7 127    5/7 133      EASTERN NEVADA BASINS 5/14 140    5/14 163      SOUTHERN NEVADA - Spring Mountains 3/3 67    3/3 155    NEW MEXICO   RIO CHAMA RIVER BASIN 4/5 89    4/5 104      UPPER RIO GRANDE BASIN - New Mexico 10/12 126    10/12 141      SANGRE DE CRISTO MOUNTAIN RANGE BASINS 10/11 130    10/11 136      JEMEZ RIVER BASIN 3/4 126    3/4 154      SAN FRANCISCO RIVER BASIN 6/6 26    5/6 125      GILA RIVER BASIN 3/3 0    3/3 138      MIMBRES RIVER BASIN 2/2 0    2/2 147      PECOS RIVER BASIN 3/3 147    3/3 152      SAN JUAN RIVER BASIN 13/13 99    13/13 115      ANIMAS RIVER BASIN 7/7 92    7/7 119      CANADIAN RIVER BASIN 6/7 125    6/7 136      ZUNI/BLUEWATER RIVER BASIN 1/1 133    1/1 104      RIO HONDO BASIN 1/1 0    1/1 218      CHUSKA MOUNTAINS 2/2 168    2/2 146    OREGON   OWYHEE 8/12 170    9/12 134      MALHEUR 3/3 174    3/3 94      GRANDE RONDE, POWDER, BURNT, IMNAHA 19/19 129    19/19 105      UMATILLA, WALLA WALLA, WILLOW 10/10 104    10/10 97      JOHN DAY 13/13 147    13/13 94      UPPER DESCHUTES, CROOKED 14/14 53    14/14 92      HOOD, SANDY, LOWER DESCHUTES 9/10 32    9/10 114      COAST RANGE 2/2 0    2/2 145      WILLAMETTE 21/23 27    21/23 103      ROGUE, UMPQUA 12/13 67    12/13 92      KLAMATH 18/20 82    18/20 88      LAKE COUNTY, GOOSE LAKE 6/7 115    6/7 91      HARNEY 11/12 133    11/12 103    UTAH   RAFT RIVER 2/2 86    2/2 87      BEAR RIVER 25/26 78    25/26 77      WEBER-OGDEN RIVERS 20/23 65    20/23 64      PROVO R.-UTAH LAKE-JORDAN R. 19/25 65    19/25 71      TOOELE VALLEY-VERNON CREEK 3/4 62    3/4 87      NORTHEASTERN UINTAHS 11/13 108    11/13 96      DUCHESNE RIVER 14/15 73    14/15 86      PRICE-SAN RAFAEL 8/14 73    8/14 94      DIRTY DEVIL 5/9 85    5/9 103      SOUTH EASTERN UTAH 5/11 151    5/11 142      UPPER SEVIER RIVER 17/23 103    18/23 129      SAN PITCH RIVER 6/12 75    6/12 83      LOWER SEVIER RIVER 3/5 100    3/5 106      BEAVER RIVER 3/3 56    3/3 102      ESCALANTE RIVER 4/5 124    4/5 172      SOUTHWESTERN UTAH 10/13 125    10/13 129    WASHINGTON   SPOKANE 9/9 98    9/9 90      LOWER PEND OREILLE 5/5 104    5/5 118      UPPER COLUMBIA 7/9 135    7/9 127      CENTRAL COLUMBIA 11/11 127    11/11 141      UPPER YAKIMA 7/7 111    7/7 137      NACHES 8/8 94    8/8 127      LOWER YAKIMA 3/4 145    3/4 108      KLICKITAT 4/5 132    4/5 110      LOWER SNAKE, WALLA WALLA 14/14 121    14/14 105      LOWER COLUMBIA 15/17 81    15/17 121      SOUTH PUGET SOUND 13/14 77    13/14 137      CENTRAL PUGET SOUND 9/9 53    9/9 130      NORTH PUGET SOUND 12/13 121    11/13 122      OLYMPIC 4/4 107    4/4 124    WYOMING   SNAKE RIVER 22/22 79    22/22 85      MADISON HEADWATERS IN WYOMING 4/5 85    4/5 87      YELLOWSTONE HEADWATERS IN WYOMING 11/12 81    11/12 92      WIND RIVER 9/11 72    9/11 78      BIGHORN BASIN 11/11 50    11/11 65      SHOSHONE RIVER 6/6 75    6/6 93      POWDER RIVER 7/7 48    7/7 53      TONGUE RIVER 7/7 46    7/7 53      BELLE FOURCHE 3/3 81    3/3 75      CHEYENNE RIVER BASIN 2/2 82    2/2 69      UPPER N. PLATTE 19/20 75    19/20 77      SWEETWATER 3/3 72    3/3 67      LOWER N. PLATTE 4/4 57    4/4 78      LARAMIE RIVER 7/7 99    7/7 100      S. PLATTE 1/1 100    1/1 129      LITTLE SNAKE RIVER 8/9 66    8/9 65      UPPER GREEN RIVER 14/15 87    14/15 87      LOWER GREEN RIVER 10/12 104    10/12 89      UPPER BEAR RIVER 12/12 84    12/12 75

-M  = Missing data.
 *  = Analysis may not provide a valid measure of conditions.
N/A = Not available.

Footnotes for median and average:
(##) = If less than 30 years are available, this value specifies the number of years used for the median and average calculations.
Sites with less than 10 years available do not have medians or averages.

If the Basin Index (%) percent value is flagged as potentially invalid,
care should be taken to evaluate if the value is representative
of conditions in the basin.

The SNOW WATER EQUIVALENT represents the depth of water in the snowpack, if the
snowpack were melted, expressed in inches.


The WATER YEAR-TO-DATE-PRECIPITATION represents total precipitation since October 1st, expressed in inches.


Contact your state water supply staff for assistance.

Medians and averages are calculated for the period 1991-2020.

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 or average for the day is less than 10% of the maximum median or average value for the year.

* Basin - More than half of the stations for a basin with normals report missing or invalid data.

The basin index is calculated as the sum of the valid current values divided by the sum of the corresponding medians or averages and the resulting fraction multiplied by 100.