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, March 17, 2022
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 4/4 142    4/4 126      SUSITNA BASIN 1/5 163    3/5 145      NORTHERN KENAI MOUNTAINS 6/7 97    6/7 106      SOUTHERN KENAI 2/6 109    4/6 90      COPPER BASIN 2/3 106    2/3 87      PRINCE WILLIAM SOUND 1/7 181    3/7 105      CHENA BASIN 5/7 212    6/7 180      UPPER TANANA 2/4 210    2/4 188      KOYUKUK BASIN 2/6 136    4/6 117      CENTRAL YUKON BASIN 0/5 *   3/5 170      NORTON SOUND 0/4 *   2/4 106      KUPARUK-SAGAVANIRKTOK RIVER BASIN 0/3 *   3/3 104      NORTHWEST ARCTIC RIVER BASIN 1/1 127    1/1 95      SOUTHEAST ALASKA BASIN 1/3 123    2/3 109    ARIZONA   VERDE RIVER BASIN 9/10 145    8/10 82      SAN FRANCISCO PEAKS 1/1 116    1/1 90      CENTRAL MOGOLLON RIM 4/4 50    4/4 66      LITTLE COLORADO RIVER BASIN 11/11 88    11/11 76      SALT RIVER BASIN 9/10 43*   8/10 63      SAN FRANCISCO / UPPER GILA RIVER BASIN 8/8 29*   7/8 49      CHUSKA MOUNTAINS 2/2 179    2/2 97    CALIFORNIA   NORTHERN GREAT BASIN 7/8 76    7/8 97      TRUCKEE RIVER 11/12 76    11/12 101      LAKE TAHOE 11/11 66    11/11 103      CARSON RIVER 12/12 67    12/12 98      WALKER RIVER 7/8 69    7/8 94    COLORADO   GUNNISON RIVER BASIN 15/16 112    15/16 112      UPPER COLORADO RIVER BASIN 32/35 103    32/35 105      SOUTH PLATTE RIVER BASIN 21/22 99    21/22 102      LARAMIE AND NORTH PLATTE RIVER BASINS 12/12 99    12/12 104      YAMPA AND WHITE RIVER BASINS 20/22 92    21/22 100      ARKANSAS RIVER BASIN 11/11 92    11/11 96      UPPER RIO GRANDE BASIN 17/20 98    18/20 94      SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS 20/21 105    20/21 100    IDAHO   NORTHERN PANHANDLE REGION 10/10 92    9/10 107      COEUR D'ALENE-ST. JOE RIVER BASIN 7/7 99    7/7 102      CLEARWATER BASIN 16/16 96    15/16 102      SALMON BASIN 20/20 88    20/20 94      WEISER BASIN 4/4 78    4/4 87      PAYETTE BASIN 12/12 80    12/12 89      BOISE BASIN 10/11 78    10/11 89      BIG WOOD BASIN 8/9 83    8/9 89      LITTLE WOOD BASIN 4/5 90    4/5 111      BIG LOST BASIN 5/5 90    5/5 104      LITTLE LOST 3/3 95    3/3 108      BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS 4/4 76    4/4 114      HENRYS FORK, TETON BASINS 8/8 74    8/8 88      SNAKE BASIN ABOVE PALISADES 21/21 79    21/21 90      WILLOW, BLACKFOOT, PORTNEUF BASINS 6/7 79    6/7 100      SNAKE BASIN ABOVE AMERICAN FALLS 29/29 78    29/29 91      RAFT BASIN 2/2 94    2/2 98      GOOSE CREEK BASIN 2/2 95    2/2 111      SALMON FALLS BASIN 4/6 91    4/6 109      BRUNEAU BASIN 5/8 78    5/8 101      OWYHEE BASIN 8/12 76    9/12 101      BEAR RIVER BASIN 21/21 84    21/21 101    MONTANA   KOOTENAI RIVER BASIN 8/8 104    8/8 115      FLATHEAD RIVER BASIN 14/17 106    14/17 113      UPPER CLARK FORK RIVER BASIN 14/14 91    14/14 100      BITTERROOT RIVER BASIN 8/8 96    8/8 103      LOWER CLARK FORK RIVER BASIN 9/9 100    9/9 104      JEFFERSON RIVER BASIN 19/21 87    19/21 101      MADISON RIVER BASIN 11/12 80    11/12 93      GALLATIN RIVER BASIN 7/7 80    7/7 92      MISSOURI HEADWATERS 31/31 83    31/31 96      HELENA VALLEY 4/4 80    4/4 92      SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS 7/9 85    7/9 80      SUN, TETON AND MARIAS RIVER BASINS 5/6 112    5/6 114      MISSOURI MAINSTEM RIVER BASIN 18/21 95    18/21 95      ST. MARYS RIVER BASIN 2/2 109    2/2 118      MILK RIVER BASIN 1/1 91    1/1 87      UPPER YELLOWSTONE RIVER BASIN 21/22 82    21/22 89      WIND RIVER BASIN (WYOMING) 11/13 96    11/13 100      SHOSHONE RIVER BASIN (WYOMING) 6/6 83    6/6 87      BIGHORN RIVER BASIN (WYOMING) 24/26 88    24/26 94      TONGUE RIVER BASIN (WYOMING) 7/7 90    7/7 105      POWDER RIVER BASIN (WYOMING) 7/7 85    7/7 99      LOWER YELLOWSTONE RIVER BASIN 33/35 88    33/35 98    NEVADA   NORTHERN GREAT BASIN 7/8 76    7/8 97      SNAKE RIVER 7/11 83    7/11 105      OWYHEE RIVER 6/10 76    7/10 101      UPPER HUMBOLDT RIVER 9/17 72    10/17 96      LOWER HUMBOLDT RIVER 6/10 81    7/10 108      CLOVER VALLEY & FRANKLIN RIVER 5/7 76    5/7 96      EASTERN NEVADA BASINS 5/14 89    5/14 103      SOUTHERN NEVADA - Spring Mountains 3/3 155    3/3 106    NEW MEXICO   RIO CHAMA RIVER BASIN 4/5 106    4/5 102      UPPER RIO GRANDE BASIN - New Mexico 10/12 89    10/12 77      SANGRE DE CRISTO MOUNTAIN RANGE BASINS 10/11 78    10/11 78      JEMEZ RIVER BASIN 3/4 85    3/4 66      SAN FRANCISCO RIVER BASIN 6/6 29*   5/6 52      GILA RIVER BASIN 3/3 11*   3/3 45      MIMBRES RIVER BASIN 2/2 *   2/2 37      PECOS RIVER BASIN 3/3 68    3/3 69      SAN JUAN RIVER BASIN 13/13 104    13/13 98      ANIMAS RIVER BASIN 7/7 100    7/7 99      CANADIAN RIVER BASIN 6/7 86    6/7 74      ZUNI/BLUEWATER RIVER BASIN 1/1 212    1/1 109      RIO HONDO BASIN 1/1 3    1/1 48      CHUSKA MOUNTAINS 2/2 179    2/2 97    OREGON   OWYHEE 8/12 76    9/12 101      MALHEUR 3/3 52    3/3 70      GRANDE RONDE, POWDER, BURNT, IMNAHA 19/19 84    19/19 87      UMATILLA, WALLA WALLA, WILLOW 10/10 95    10/10 94      JOHN DAY 13/13 75    13/13 84      UPPER DESCHUTES, CROOKED 14/14 72    14/14 84      HOOD, SANDY, LOWER DESCHUTES 9/10 111    9/10 100      COAST RANGE 2/2 0    2/2 114      WILLAMETTE 21/23 89    21/23 94      ROGUE, UMPQUA 12/13 63    12/13 72      KLAMATH 18/20 52    18/20 72      LAKE COUNTY, GOOSE LAKE 6/7 63    6/7 80      HARNEY 11/12 68    11/12 89    UTAH   RAFT RIVER 2/2 94    2/2 98      BEAR RIVER 25/26 85    25/26 101      WEBER-OGDEN RIVERS 20/23 82    20/23 99      PROVO R.-UTAH LAKE-JORDAN R. 19/25 83    19/25 102      TOOELE VALLEY-VERNON CREEK 3/4 73    3/4 91      NORTHEASTERN UINTAHS 11/13 99    11/13 110      DUCHESNE RIVER 14/15 95    14/15 112      PRICE-SAN RAFAEL 8/14 91    8/14 118      DIRTY DEVIL 5/9 91    5/9 109      SOUTH EASTERN UTAH 5/11 102    5/11 108      UPPER SEVIER RIVER 17/23 94    18/23 99      SAN PITCH RIVER 6/12 87    6/12 107      LOWER SEVIER RIVER 3/5 92    3/5 94      BEAVER RIVER 3/3 113    3/3 107      ESCALANTE RIVER 4/5 87    4/5 89      SOUTHWESTERN UTAH 10/13 96    10/13 105    WASHINGTON   SPOKANE 9/9 95    9/9 101      LOWER PEND OREILLE 5/5 90    5/5 102      UPPER COLUMBIA 7/9 94    7/9 107      CENTRAL COLUMBIA 11/11 89    11/11 107      UPPER YAKIMA 7/7 86    7/7 102      NACHES 8/8 84    7/8 103      LOWER YAKIMA 3/4 55    3/4 90      KLICKITAT 4/5 68    4/5 97      LOWER SNAKE, WALLA WALLA 14/14 84    14/14 88      LOWER COLUMBIA 15/17 88    14/17 111      SOUTH PUGET SOUND 13/14 90    12/14 106      CENTRAL PUGET SOUND 9/9 95    9/9 113      NORTH PUGET SOUND 12/13 93    11/13 113      OLYMPIC 4/4 80    4/4 106    WYOMING   SNAKE RIVER 22/22 79    22/22 90      MADISON HEADWATERS IN WYOMING 4/5 75    4/5 84      YELLOWSTONE HEADWATERS IN WYOMING 11/12 84    11/12 88      WIND RIVER 9/11 95    9/11 102      BIGHORN BASIN 11/11 87    11/11 94      SHOSHONE RIVER 6/6 83    6/6 87      POWDER RIVER 7/7 85    7/7 99      TONGUE RIVER 7/7 90    7/7 105      BELLE FOURCHE 3/3 67    3/3 81      CHEYENNE RIVER BASIN 2/2 66    2/2 73      UPPER N. PLATTE 19/20 94    19/20 101      SWEETWATER 2/3 80    3/3 91      LOWER N. PLATTE 4/4 87    4/4 115      LARAMIE RIVER 7/7 101    7/7 102      S. PLATTE 1/1 78    1/1 100      LITTLE SNAKE RIVER 8/9 92    8/9 101      UPPER GREEN RIVER 13/15 79    14/15 92      LOWER GREEN RIVER 10/12 90    10/12 105      UPPER BEAR RIVER 12/12 87    12/12 103

-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.