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, April 23, 2024
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 4/4 122    4/4 111      SUSITNA BASIN 2/5 129    4/5 112      NORTHERN KENAI MOUNTAINS 6/7 120    6/7 90      SOUTHERN KENAI 2/6 150    5/6 81      COPPER BASIN 2/3 184    2/3 137      PRINCE WILLIAM SOUND 1/7 158    3/7 111      CHENA BASIN 5/7 73    6/7 96      UPPER TANANA 2/4 138    1/4 128      KOYUKUK BASIN 2/6 113    4/6 115      CENTRAL YUKON BASIN 0/5 *   3/5 98      NORTON SOUND 0/4 *   2/4 108      KUPARUK-SAGAVANIRKTOK RIVER BASIN 0/3 *   3/3 139      NORTHWEST ARCTIC RIVER BASIN 0/1 *   1/1 92      SOUTHEAST ALASKA BASIN 1/3 108    2/3 126    ARIZONA   VERDE RIVER BASIN 6/10 1156*   8/10 97      SAN FRANCISCO PEAKS 1/1 201    1/1 100      CENTRAL MOGOLLON RIM 3/4 888*   4/4 97      LITTLE COLORADO RIVER BASIN 9/11 359*   11/11 98      SALT RIVER BASIN 5/10 *   8/10 97      SAN FRANCISCO / UPPER GILA RIVER BASIN 7/8 *   7/8 111      CHUSKA MOUNTAINS 2/2 *   2/2 130    CALIFORNIA   NORTHERN GREAT BASIN 7/8 134    7/8 117      TRUCKEE RIVER 11/12 102    11/12 95      LAKE TAHOE 11/11 95    11/11 94      CARSON RIVER 12/12 112    12/12 100      WALKER RIVER 7/8 101    7/8 99    COLORADO   GUNNISON RIVER BASIN 15/16 79    15/16 97      UPPER COLORADO RIVER BASIN 31/35 95    31/35 102      SOUTH PLATTE RIVER BASIN 21/22 98    21/22 97      LARAMIE AND NORTH PLATTE RIVER BASINS 12/12 97    12/12 100      YAMPA AND WHITE RIVER BASINS 20/22 99    21/22 106      ARKANSAS RIVER BASIN 10/11 83    10/11 100      UPPER RIO GRANDE BASIN 17/20 78    18/20 89      SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS 19/21 78    19/21 86    IDAHO   NORTHERN PANHANDLE REGION 10/10 75    9/10 88      COEUR D'ALENE-ST. JOE RIVER BASIN 6/7 68    7/7 77      CLEARWATER BASIN 15/16 65    15/16 77      SALMON BASIN 20/20 81    20/20 87      WEISER BASIN 4/4 88    3/4 90      PAYETTE BASIN 12/12 85    12/12 89      BOISE BASIN 10/11 89    10/11 93      BIG WOOD BASIN 8/9 90    8/9 90      LITTLE WOOD BASIN 3/5 75    4/5 96      BIG LOST BASIN 5/5 76    5/5 99      LITTLE LOST 3/3 87    3/3 92      BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS 4/4 74    4/4 94      HENRYS FORK, TETON BASINS 8/8 89    8/8 101      SNAKE BASIN ABOVE PALISADES 21/21 88    21/21 97      WILLOW, BLACKFOOT, PORTNEUF BASINS 6/7 130    6/7 119      SNAKE BASIN ABOVE AMERICAN FALLS 29/29 92    29/29 101      RAFT BASIN 2/2 113    2/2 128      GOOSE CREEK BASIN 2/2 140    2/2 115      SALMON FALLS BASIN 4/6 123    4/6 114      BRUNEAU BASIN 5/8 116    5/8 114      OWYHEE BASIN 8/12 183    9/12 126      BEAR RIVER BASIN 21/21 108    21/21 111    MONTANA   KOOTENAI RIVER BASIN 8/8 76    8/8 85      FLATHEAD RIVER BASIN 14/17 69    14/17 80      UPPER CLARK FORK RIVER BASIN 14/14 59    14/14 72      BITTERROOT RIVER BASIN 8/8 59    8/8 75      LOWER CLARK FORK RIVER BASIN 9/9 69    9/9 75      JEFFERSON RIVER BASIN 19/21 70    19/21 83      MADISON RIVER BASIN 11/12 78    11/12 88      GALLATIN RIVER BASIN 7/7 68    7/7 81      MISSOURI HEADWATERS 31/31 72    31/31 85      HELENA VALLEY 4/4 44    4/4 78      SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS 7/9 64    7/9 76      SUN, TETON AND MARIAS RIVER BASINS 5/6 55    5/6 67      MISSOURI MAINSTEM RIVER BASIN 18/21 57    18/21 75      ST. MARYS RIVER BASIN 2/2 77    2/2 81      MILK RIVER BASIN 1/1 *   1/1 94      UPPER YELLOWSTONE RIVER BASIN 21/22 68    21/22 86      WIND RIVER BASIN (WYOMING) 11/13 91    11/13 104      SHOSHONE RIVER BASIN (WYOMING) 6/6 81    6/6 101      BIGHORN RIVER BASIN (WYOMING) 24/26 87    24/26 101      TONGUE RIVER BASIN (WYOMING) 7/7 78    7/7 99      POWDER RIVER BASIN (WYOMING) 7/7 80    7/7 101      LOWER YELLOWSTONE RIVER BASIN 33/35 84    33/35 102    NEVADA   NORTHERN GREAT BASIN 7/8 134    7/8 117      SNAKE RIVER 7/11 125    7/11 114      OWYHEE RIVER 6/10 184    7/10 124      UPPER HUMBOLDT RIVER 9/17 118    10/17 120      LOWER HUMBOLDT RIVER 6/10 168    7/10 128      CLOVER VALLEY & FRANKLIN RIVER 5/7 134    5/7 123      EASTERN NEVADA BASINS 5/14 102    5/14 115      SOUTHERN NEVADA - Spring Mountains 3/3 *   3/3 108    NEW MEXICO   RIO CHAMA RIVER BASIN 4/5 81    4/5 90      UPPER RIO GRANDE BASIN - New Mexico 10/12 104*   10/12 97      SANGRE DE CRISTO MOUNTAIN RANGE BASINS 10/11 92    10/11 91      JEMEZ RIVER BASIN 2/4 *   2/4 109      SAN FRANCISCO RIVER BASIN 5/6 *   5/6 113      GILA RIVER BASIN 3/3 *   3/3 111      MIMBRES RIVER BASIN 2/2 *   2/2 96      PECOS RIVER BASIN 3/3 91    3/3 94      SAN JUAN RIVER BASIN 12/13 79    12/13 86      ANIMAS RIVER BASIN 6/7 76    6/7 88      CANADIAN RIVER BASIN 6/7 71*   6/7 84      ZUNI/BLUEWATER RIVER BASIN 1/1 *   1/1 127      RIO HONDO BASIN 1/1 *   1/1 106      CHUSKA MOUNTAINS 2/2 *   2/2 130    OREGON   OWYHEE 8/12 183    9/12 126      MALHEUR 2/3 83*   3/3 113      GRANDE RONDE, POWDER, BURNT, IMNAHA 19/19 77    18/19 92      UMATILLA, WALLA WALLA, WILLOW 10/10 74    10/10 92      JOHN DAY 11/13 80*   13/13 110      UPPER DESCHUTES, CROOKED 12/14 88    12/14 104      HOOD, SANDY, LOWER DESCHUTES 8/10 88    9/10 95      COAST RANGE 2/2 *   2/2 115      WILLAMETTE 20/23 93    18/23 103      ROGUE, UMPQUA 10/13 100    12/13 99      KLAMATH 16/20 95    18/20 100      LAKE COUNTY, GOOSE LAKE 6/7 87    6/7 102      HARNEY 9/12 145*   11/12 120    UTAH   RAFT RIVER 2/2 113    2/2 128      BEAR RIVER 25/26 108    25/26 112      WEBER-OGDEN RIVERS 20/23 122    20/23 116      PROVO R.-UTAH LAKE-JORDAN R. 19/25 115    19/25 119      TOOELE VALLEY-VERNON CREEK 3/4 115    3/4 114      NORTHEASTERN UINTAHS 11/13 82    11/13 101      DUCHESNE RIVER 14/15 97    14/15 110      PRICE-SAN RAFAEL 8/14 100    8/14 114      DIRTY DEVIL 5/9 103    5/9 108      SOUTH EASTERN UTAH 5/11 46    5/11 95      UPPER SEVIER RIVER 17/23 111    18/23 99      SAN PITCH RIVER 6/12 102    6/12 111      LOWER SEVIER RIVER 3/5 136    3/5 113      BEAVER RIVER 3/3 104    3/3 100      ESCALANTE RIVER 4/5 137    4/5 109      SOUTHWESTERN UTAH 10/13 99*   10/13 89    WASHINGTON   SPOKANE 8/9 67    9/9 81      LOWER PEND OREILLE 5/5 76    5/5 88      UPPER COLUMBIA 7/9 53    7/9 82      CENTRAL COLUMBIA 11/11 55    11/11 80      UPPER YAKIMA 7/7 65    7/7 78      NACHES 8/8 70    7/8 79      LOWER YAKIMA 3/4 46    3/4 75      KLICKITAT 4/5 67    4/5 82      LOWER SNAKE, WALLA WALLA 14/14 75    14/14 91      LOWER COLUMBIA 15/17 84    14/17 104      SOUTH PUGET SOUND 13/14 61    12/14 78      CENTRAL PUGET SOUND 9/9 62    9/9 77      NORTH PUGET SOUND 12/13 58    11/13 79      OLYMPIC 4/4 60    4/4 83    WYOMING   SNAKE RIVER 22/22 88    22/22 97      MADISON HEADWATERS IN WYOMING 4/5 83    4/5 95      YELLOWSTONE HEADWATERS IN WYOMING 11/12 74    11/12 88      WIND RIVER 9/11 92    9/11 104      BIGHORN BASIN 11/11 95    11/11 105      SHOSHONE RIVER 6/6 81    6/6 101      POWDER RIVER 7/7 80    7/7 101      TONGUE RIVER 7/7 78    7/7 99      BELLE FOURCHE 3/3 7    3/3 77      CHEYENNE RIVER BASIN 2/2 9    2/2 76      UPPER N. PLATTE 19/20 97    19/20 101      SWEETWATER 3/3 91    3/3 103      LOWER N. PLATTE 4/4 79    4/4 97      LARAMIE RIVER 7/7 100    7/7 100      S. PLATTE 1/1 77    1/1 92      LITTLE SNAKE RIVER 8/9 99    8/9 104      UPPER GREEN RIVER 14/15 78    13/15 96      LOWER GREEN RIVER 9/12 89    10/12 103      UPPER BEAR RIVER 12/12 103    12/12 108

-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.