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 Friday, December 08, 2023
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 4/4 156    4/4 126      SUSITNA BASIN 2/5 103    4/5 113      NORTHERN KENAI MOUNTAINS 6/7 173    6/7 106      SOUTHERN KENAI 3/6 123    5/6 73      COPPER BASIN 2/3 136    2/3 146      PRINCE WILLIAM SOUND 1/7 92    3/7 106      CHENA BASIN 5/7 100    6/7 115      UPPER TANANA 2/4 117    2/4 137      KOYUKUK BASIN 2/6 128    4/6 118      CENTRAL YUKON BASIN 0/5 *   3/5 96      NORTON SOUND 0/4 *   2/4 79      KUPARUK-SAGAVANIRKTOK RIVER BASIN 0/3 *   3/3 167      NORTHWEST ARCTIC RIVER BASIN 1/1 81    1/1 138      SOUTHEAST ALASKA BASIN 1/3 92    2/3 140    ARIZONA   VERDE RIVER BASIN 5/10 56*   8/10 36      SAN FRANCISCO PEAKS 1/1 91    1/1 53      CENTRAL MOGOLLON RIM 3/4 32    4/4 46      LITTLE COLORADO RIVER BASIN 7/11 61    10/11 47      SALT RIVER BASIN 7/10 47    8/10 50      SAN FRANCISCO / UPPER GILA RIVER BASIN 7/8 110    6/8 56      CHUSKA MOUNTAINS 2/2 155    2/2 94    CALIFORNIA   NORTHERN GREAT BASIN 7/8 152    7/8 125      TRUCKEE RIVER 11/12 66    11/12 74      LAKE TAHOE 11/11 60    11/11 69      CARSON RIVER 12/12 51    12/12 55      WALKER RIVER 7/8 57    7/8 60    COLORADO   GUNNISON RIVER BASIN 15/16 87    15/16 93      UPPER COLORADO RIVER BASIN 32/35 93    32/35 99      SOUTH PLATTE RIVER BASIN 21/22 82    21/22 77      LARAMIE AND NORTH PLATTE RIVER BASINS 12/12 85    12/12 86      YAMPA AND WHITE RIVER BASINS 20/22 88    21/22 98      ARKANSAS RIVER BASIN 11/11 66    11/11 79      UPPER RIO GRANDE BASIN 17/20 50    18/20 60      SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS 19/21 73    19/21 61    IDAHO   NORTHERN PANHANDLE REGION 10/10 67    9/10 100      COEUR D'ALENE-ST. JOE RIVER BASIN 7/7 66    7/7 83      CLEARWATER BASIN 16/16 66    16/16 79      SALMON BASIN 20/20 83    20/20 82      WEISER BASIN 4/4 86    4/4 90      PAYETTE BASIN 12/12 87    12/12 94      BOISE BASIN 10/11 102    10/11 97      BIG WOOD BASIN 8/9 87    8/9 84      LITTLE WOOD BASIN 4/5 82    4/5 96      BIG LOST BASIN 5/5 79    5/5 90      LITTLE LOST 3/3 78    3/3 83      BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS 4/4 59    4/4 87      HENRYS FORK, TETON BASINS 8/8 93    8/8 109      SNAKE BASIN ABOVE PALISADES 20/21 90    20/21 118      WILLOW, BLACKFOOT, PORTNEUF BASINS 6/7 146    6/7 129      SNAKE BASIN ABOVE AMERICAN FALLS 28/29 95    28/29 105      RAFT BASIN 2/2 177    2/2 164      GOOSE CREEK BASIN 2/2 224    2/2 152      SALMON FALLS BASIN 4/6 163    4/6 140      BRUNEAU BASIN 5/8 140    5/8 121      OWYHEE BASIN 8/12 209    9/12 146      BEAR RIVER BASIN 20/21 128    20/21 119    MONTANA   KOOTENAI RIVER BASIN 8/8 79    8/8 98      FLATHEAD RIVER BASIN 14/17 64    14/17 86      UPPER CLARK FORK RIVER BASIN 14/14 43    14/14 65      BITTERROOT RIVER BASIN 8/8 70    8/8 79      LOWER CLARK FORK RIVER BASIN 9/9 63    9/9 78      JEFFERSON RIVER BASIN 19/21 64    19/21 81      MADISON RIVER BASIN 11/12 75    11/12 95      GALLATIN RIVER BASIN 7/7 70    7/7 84      MISSOURI HEADWATERS 31/31 69    31/31 87      HELENA VALLEY 4/4 44    4/4 66      SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS 7/9 62    7/9 78      SUN, TETON AND MARIAS RIVER BASINS 5/6 38    5/6 67      MISSOURI MAINSTEM RIVER BASIN 18/21 48    18/21 73      ST. MARYS RIVER BASIN 2/2 71    2/2 94      MILK RIVER BASIN 1/1 17    1/1 102      UPPER YELLOWSTONE RIVER BASIN 21/22 71    21/22 98      WIND RIVER BASIN (WYOMING) 11/13 96    11/13 172      SHOSHONE RIVER BASIN (WYOMING) 6/6 98    6/6 192      BIGHORN RIVER BASIN (WYOMING) 24/26 93    24/26 144      TONGUE RIVER BASIN (WYOMING) 7/7 83    7/7 140      POWDER RIVER BASIN (WYOMING) 7/7 67    7/7 118      LOWER YELLOWSTONE RIVER BASIN 33/35 91    33/35 144    NEVADA   NORTHERN GREAT BASIN 7/8 152    7/8 125      SNAKE RIVER 7/11 166    7/11 131      OWYHEE RIVER 6/10 212    7/10 150      UPPER HUMBOLDT RIVER 9/17 163    10/17 136      LOWER HUMBOLDT RIVER 6/10 169    7/10 136      CLOVER VALLEY & FRANKLIN RIVER 5/7 170    5/7 140      EASTERN NEVADA BASINS 5/14 98    5/14 78      SOUTHERN NEVADA - Spring Mountains 3/3 10    3/3 43    NEW MEXICO   RIO CHAMA RIVER BASIN 4/5 60    4/5 50      UPPER RIO GRANDE BASIN - New Mexico 9/12 59    9/12 47      SANGRE DE CRISTO MOUNTAIN RANGE BASINS 10/11 55    10/11 45      JEMEZ RIVER BASIN 3/4 150    3/4 95      SAN FRANCISCO RIVER BASIN 5/6 106    4/6 56      GILA RIVER BASIN 3/3 179    3/3 58      MIMBRES RIVER BASIN 2/2 140    2/2 53      PECOS RIVER BASIN 3/3 74    3/3 47      SAN JUAN RIVER BASIN 12/13 67    12/13 58      ANIMAS RIVER BASIN 6/7 63    6/7 59      CANADIAN RIVER BASIN 5/7 40    5/7 41      ZUNI/BLUEWATER RIVER BASIN 1/1 300    1/1 111      RIO HONDO BASIN 1/1 62    1/1 60      CHUSKA MOUNTAINS 2/2 155    2/2 94    OREGON   OWYHEE 8/12 209    9/12 146      MALHEUR 3/3 150    3/3 116      GRANDE RONDE, POWDER, BURNT, IMNAHA 19/19 75    19/19 102      UMATILLA, WALLA WALLA, WILLOW 10/10 71    10/10 112      JOHN DAY 13/13 94    13/13 120      UPPER DESCHUTES, CROOKED 14/14 79    14/14 109      HOOD, SANDY, LOWER DESCHUTES 9/10 40    9/10 98      COAST RANGE 2/2 0    2/2 122      WILLAMETTE 21/23 71    21/23 108      ROGUE, UMPQUA 12/13 106    12/13 101      KLAMATH 18/20 98    18/20 96      LAKE COUNTY, GOOSE LAKE 6/7 106    6/7 89      HARNEY 11/12 163    11/12 130    UTAH   RAFT RIVER 2/2 177    2/2 164      BEAR RIVER 24/26 134    24/26 118      WEBER-OGDEN RIVERS 20/23 129    20/23 123      PROVO R.-UTAH LAKE-JORDAN R. 19/25 110    19/25 117      TOOELE VALLEY-VERNON CREEK 3/4 101    3/4 96      NORTHEASTERN UINTAHS 11/13 77    11/13 93      DUCHESNE RIVER 14/15 78    14/15 85      PRICE-SAN RAFAEL 8/14 85    8/14 91      DIRTY DEVIL 5/9 64    5/9 69      SOUTH EASTERN UTAH 5/11 79    5/11 63      UPPER SEVIER RIVER 17/23 75    18/23 66      SAN PITCH RIVER 6/12 91    6/12 90      LOWER SEVIER RIVER 3/5 96    3/5 89      BEAVER RIVER 3/3 83    3/3 75      ESCALANTE RIVER 4/5 46    4/5 50      SOUTHWESTERN UTAH 10/13 67    10/13 49    WASHINGTON   SPOKANE 9/9 69    9/9 93      LOWER PEND OREILLE 5/5 63    5/5 105      UPPER COLUMBIA 7/9 75    7/9 104      CENTRAL COLUMBIA 11/11 70    11/11 92      UPPER YAKIMA 7/7 78    7/7 86      NACHES 8/8 73    7/8 88      LOWER YAKIMA 3/4 50    3/4 90      KLICKITAT 4/5 58    4/5 94      LOWER SNAKE, WALLA WALLA 14/14 72    14/14 102      LOWER COLUMBIA 15/17 58    14/17 121      SOUTH PUGET SOUND 13/14 70    12/14 93      CENTRAL PUGET SOUND 9/9 74    9/9 85      NORTH PUGET SOUND 12/13 63    11/13 85      OLYMPIC 4/4 43    4/4 78    WYOMING   SNAKE RIVER 21/22 89    21/22 116      MADISON HEADWATERS IN WYOMING 4/5 81    4/5 109      YELLOWSTONE HEADWATERS IN WYOMING 11/12 83    11/12 105      WIND RIVER 9/11 100    9/11 118      BIGHORN BASIN 11/11 94    11/11 131      SHOSHONE RIVER 6/6 98    6/6 192      POWDER RIVER 7/7 67    7/7 118      TONGUE RIVER 7/7 83    7/7 140      BELLE FOURCHE 3/3 31    3/3 75      CHEYENNE RIVER BASIN 2/2 32    2/2 83      UPPER N. PLATTE 19/20 76    19/20 82      SWEETWATER 3/3 100    3/3 110      LOWER N. PLATTE 4/4 46    4/4 106      LARAMIE RIVER 7/7 66    7/7 75      S. PLATTE 1/1 24    1/1 66      LITTLE SNAKE RIVER 8/9 86    8/9 90      UPPER GREEN RIVER 13/15 81    13/15 92      LOWER GREEN RIVER 10/12 88    10/12 100      UPPER BEAR RIVER 11/12 106    11/12 107

-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.