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 Thursday, December 10, 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 74    4/4 87      SUSITNA BASIN 2/5 157    3/5 143      NORTHERN KENAI MOUNTAINS 6/7 87    6/7 109      SOUTHERN KENAI 3/6 75    5/6 106      COPPER BASIN 2/3 105    2/3 106      PRINCE WILLIAM SOUND 1/7 121    3/7 111      CHENA BASIN 5/7 173    6/7 137      UPPER TANANA 2/4 105    2/4 117      KOYUKUK BASIN 2/6 145    4/6 102      CENTRAL YUKON BASIN 0/5 *   3/5 130      NORTON SOUND 0/4 *   2/4 167      KUPARUK-SAGAVANIRKTOK RIVER BASIN 0/3 *   3/3 65      NORTHWEST ARCTIC RIVER BASIN 0/1 *   1/1 77      SOUTHEAST ALASKA BASIN 1/3 104    2/3 125    ARIZONA   VERDE RIVER BASIN 9/10 81    8/10 177      SAN FRANCISCO PEAKS 1/1 134    1/1 178      CENTRAL MOGOLLON RIM 4/4 76    4/4 186      LITTLE COLORADO RIVER BASIN 11/11 92    11/11 179      SALT RIVER BASIN 9/10 51    8/10 158      SAN FRANCISCO / UPPER GILA RIVER BASIN 8/8 19    7/8 128      CHUSKA MOUNTAINS 2/2 132    2/2 131    CALIFORNIA   NORTHERN GREAT BASIN 7/8 112    7/8 110      TRUCKEE RIVER 11/12 93    11/12 98      LAKE TAHOE 11/11 94    11/11 96      CARSON RIVER 12/12 109    12/12 113      WALKER RIVER 7/8 88    7/8 109    COLORADO   GUNNISON RIVER BASIN 15/16 95    15/16 97      UPPER COLORADO RIVER BASIN 32/35 97    32/35 97      SOUTH PLATTE RIVER BASIN 21/22 104    21/22 111      LARAMIE AND NORTH PLATTE RIVER BASINS 12/12 79    12/12 83      YAMPA AND WHITE RIVER BASINS 20/22 73    21/22 70      ARKANSAS RIVER BASIN 11/11 107    11/11 110      UPPER RIO GRANDE BASIN 17/20 110    18/20 109      SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS 20/21 100    20/21 113    IDAHO   NORTHERN PANHANDLE REGION 10/10 100    9/10 132      COEUR D'ALENE-ST. JOE RIVER BASIN 7/7 71    7/7 94      CLEARWATER BASIN 16/16 84    15/16 102      SALMON BASIN 20/20 109    20/20 103      WEISER BASIN 4/4 136    4/4 119      PAYETTE BASIN 12/12 114    12/12 106      BOISE BASIN 10/11 108    10/11 105      BIG WOOD BASIN 8/9 105    8/9 96      LITTLE WOOD BASIN 4/5 87    4/5 91      BIG LOST BASIN 5/5 88    5/5 88      LITTLE LOST 3/3 94    3/3 97      BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS 4/4 112    4/4 102      HENRYS FORK, TETON BASINS 8/8 79    8/8 90      SNAKE BASIN ABOVE PALISADES 21/21 82    21/21 89      WILLOW, BLACKFOOT, PORTNEUF BASINS 6/7 83    6/7 100      SNAKE BASIN ABOVE AMERICAN FALLS 29/29 82    29/29 91      RAFT BASIN 2/2 88    2/2 86      GOOSE CREEK BASIN 2/2 119    2/2 101      SALMON FALLS BASIN 4/6 132    4/6 131      BRUNEAU BASIN 5/8 154    5/8 152      OWYHEE BASIN 8/12 146    9/12 131      BEAR RIVER BASIN 21/21 75    21/21 77    MONTANA   KOOTENAI RIVER BASIN 8/8 94    8/8 126      FLATHEAD RIVER BASIN 14/17 70    14/17 89      UPPER CLARK FORK RIVER BASIN 14/14 75    14/14 94      BITTERROOT RIVER BASIN 8/8 91    8/8 99      LOWER CLARK FORK RIVER BASIN 9/9 77    9/9 106      JEFFERSON RIVER BASIN 19/21 101    19/21 97      MADISON RIVER BASIN 11/12 82    11/12 89      GALLATIN RIVER BASIN 7/7 77    7/7 93      MISSOURI HEADWATERS 31/31 91    31/31 94      HELENA VALLEY 4/4 80    4/4 81      SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS 7/9 70    7/9 77      SUN, TETON AND MARIAS RIVER BASINS 5/6 66    5/6 83      MISSOURI MAINSTEM RIVER BASIN 18/21 68    18/21 82      ST. MARYS RIVER BASIN 2/2 82    2/2 110      MILK RIVER BASIN 1/1 0    1/1 98      UPPER YELLOWSTONE RIVER BASIN 21/22 78    21/22 94      WIND RIVER BASIN (WYOMING) 11/13 75    11/13 80      SHOSHONE RIVER BASIN (WYOMING) 6/6 80    6/6 97      BIGHORN RIVER BASIN (WYOMING) 24/26 69    24/26 80      TONGUE RIVER BASIN (WYOMING) 7/7 45    7/7 54      POWDER RIVER BASIN (WYOMING) 7/7 52    7/7 55      LOWER YELLOWSTONE RIVER BASIN 33/35 64    33/35 74    NEVADA   NORTHERN GREAT BASIN 7/8 112    7/8 110      SNAKE RIVER 7/11 143    7/11 135      OWYHEE RIVER 6/10 161    7/10 132      UPPER HUMBOLDT RIVER 9/17 133    10/17 132      LOWER HUMBOLDT RIVER 6/10 144    7/10 134      CLOVER VALLEY & FRANKLIN RIVER 5/7 116    5/7 129      EASTERN NEVADA BASINS 5/14 136    5/14 160      SOUTHERN NEVADA - Spring Mountains 3/3 65    3/3 155    NEW MEXICO   RIO CHAMA RIVER BASIN 4/5 85    4/5 100      UPPER RIO GRANDE BASIN - New Mexico 10/12 124    10/12 134      SANGRE DE CRISTO MOUNTAIN RANGE BASINS 10/11 123    10/11 129      JEMEZ RIVER BASIN 3/4 109    3/4 136      SAN FRANCISCO RIVER BASIN 6/6 22    5/6 123      GILA RIVER BASIN 3/3 0    3/3 139      MIMBRES RIVER BASIN 2/2 0    2/2 144      PECOS RIVER BASIN 3/3 127    3/3 146      SAN JUAN RIVER BASIN 13/13 95    13/13 111      ANIMAS RIVER BASIN 7/7 88    7/7 115      CANADIAN RIVER BASIN 6/7 111    6/7 128      ZUNI/BLUEWATER RIVER BASIN 1/1 133    1/1 103      RIO HONDO BASIN 1/1 0    1/1 188      CHUSKA MOUNTAINS 2/2 132    2/2 131    OREGON   OWYHEE 8/12 146    9/12 131      MALHEUR 3/3 118    3/3 89      GRANDE RONDE, POWDER, BURNT, IMNAHA 19/19 106    19/19 106      UMATILLA, WALLA WALLA, WILLOW 10/10 74    10/10 101      JOHN DAY 13/13 103    13/13 94      UPPER DESCHUTES, CROOKED 14/14 42    14/14 95      HOOD, SANDY, LOWER DESCHUTES 9/10 15    9/10 120      COAST RANGE 2/2 0    2/2 157      WILLAMETTE 21/23 19    21/23 106      ROGUE, UMPQUA 12/13 58    12/13 93      KLAMATH 18/20 67    18/20 91      LAKE COUNTY, GOOSE LAKE 6/7 102    6/7 96      HARNEY 11/12 108    11/12 100    UTAH   RAFT RIVER 2/2 88    2/2 86      BEAR RIVER 25/26 74    25/26 76      WEBER-OGDEN RIVERS 20/23 61    20/23 62      PROVO R.-UTAH LAKE-JORDAN R. 19/25 60    19/25 69      TOOELE VALLEY-VERNON CREEK 3/4 59    3/4 84      NORTHEASTERN UINTAHS 11/13 105    11/13 94      DUCHESNE RIVER 14/15 71    14/15 83      PRICE-SAN RAFAEL 8/14 70    8/14 92      DIRTY DEVIL 5/9 82    5/9 102      SOUTH EASTERN UTAH 5/11 147    5/11 144      UPPER SEVIER RIVER 17/23 100    18/23 124      SAN PITCH RIVER 6/12 72    6/12 79      LOWER SEVIER RIVER 3/5 96    3/5 101      BEAVER RIVER 3/3 53    3/3 99      ESCALANTE RIVER 4/5 116    4/5 169      SOUTHWESTERN UTAH 10/13 119    10/13 126    WASHINGTON   SPOKANE 9/9 76    9/9 101      LOWER PEND OREILLE 5/5 93    5/5 131      UPPER COLUMBIA 7/9 155    7/9 144      CENTRAL COLUMBIA 11/11 133    11/11 160      UPPER YAKIMA 7/7 103    7/7 157      NACHES 8/8 88    8/8 147      LOWER YAKIMA 3/4 109    3/4 127      KLICKITAT 4/5 102    4/5 128      LOWER SNAKE, WALLA WALLA 14/14 100    14/14 107      LOWER COLUMBIA 15/17 63    15/17 138      SOUTH PUGET SOUND 13/14 67    13/14 154      CENTRAL PUGET SOUND 9/9 38    9/9 148      NORTH PUGET SOUND 12/13 129    11/13 135      OLYMPIC 4/4 98    4/4 135    WYOMING   SNAKE RIVER 22/22 82    22/22 89      MADISON HEADWATERS IN WYOMING 4/5 81    4/5 84      YELLOWSTONE HEADWATERS IN WYOMING 11/12 87    11/12 96      WIND RIVER 9/11 76    9/11 80      BIGHORN BASIN 11/11 53    11/11 67      SHOSHONE RIVER 6/6 80    6/6 97      POWDER RIVER 7/7 52    7/7 55      TONGUE RIVER 7/7 45    7/7 54      BELLE FOURCHE 3/3 75    3/3 74      CHEYENNE RIVER BASIN 2/2 80    2/2 68      UPPER N. PLATTE 19/20 73    19/20 76      SWEETWATER 3/3 72    3/3 67      LOWER N. PLATTE 4/4 55    4/4 75      LARAMIE RIVER 7/7 95    7/7 98      S. PLATTE 1/1 95    1/1 129      LITTLE SNAKE RIVER 8/9 66    8/9 63      UPPER GREEN RIVER 14/15 91    14/15 92      LOWER GREEN RIVER 10/12 104    10/12 88      UPPER BEAR RIVER 12/12 80    12/12 74

-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.