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 Wednesday, February 01, 2017
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 70    3/4 71      SUSITNA BASIN 2/5 77    3/5 54      NORTHERN KENAI MOUNTAINS 6/7 83    6/7 82      SOUTHERN KENAI 3/6 94    5/6 84      COPPER BASIN 2/3 82    2/3 63      PRINCE WILLIAM SOUND 1/7 132    3/7 61      CHENA BASIN 5/7 110    6/7 94      UPPER TANANA 2/4 60    2/4 61      KOYUKUK BASIN 2/6 74    4/6 60      CENTRAL YUKON BASIN 0/5 *   3/5 84      NORTON SOUND 0/4 *   2/4 74      KUPARUK-SAGAVANIRKTOK RIVER BASIN 0/3 *   3/3 92      NORTHWEST ARCTIC RIVER BASIN 1/1 82    1/1 90      SOUTHEAST ALASKA BASIN 1/3 82    2/3 85    ARIZONA   VERDE RIVER BASIN 9/10 193    8/10 171      SAN FRANCISCO PEAKS 1/1 266    1/1 188      CENTRAL MOGOLLON RIM 4/4 170    4/4 170      LITTLE COLORADO RIVER BASIN 11/11 201    11/11 172      SALT RIVER BASIN 9/10 143    8/10 161      SAN FRANCISCO / UPPER GILA RIVER BASIN 8/8 115    7/8 152      CHUSKA MOUNTAINS 2/2 174    2/2 138    CALIFORNIA   NORTHERN GREAT BASIN 7/8 147    7/8 156      TRUCKEE RIVER 11/12 178    11/12 229      LAKE TAHOE 11/11 180    11/11 242      CARSON RIVER 12/12 190    12/12 233      WALKER RIVER 7/8 195    7/8 226    COLORADO   GUNNISON RIVER BASIN 15/16 170    15/16 143      UPPER COLORADO RIVER BASIN 32/35 147    32/35 137      SOUTH PLATTE RIVER BASIN 21/22 138    21/22 133      LARAMIE AND NORTH PLATTE RIVER BASINS 12/12 136    12/12 137      YAMPA AND WHITE RIVER BASINS 20/22 129    21/22 122      ARKANSAS RIVER BASIN 11/11 155    11/11 122      UPPER RIO GRANDE BASIN 17/20 162    18/20 126      SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS 20/21 179    20/21 142    IDAHO   NORTHERN PANHANDLE REGION 10/10 63    9/10 111      COEUR D'ALENE-ST. JOE RIVER BASIN 7/7 76    7/7 102      CLEARWATER BASIN 16/16 81    15/16 96      SALMON BASIN 20/20 97    20/20 112      WEISER BASIN 4/4 98    3/4 107      PAYETTE BASIN 12/12 104    11/12 112      BOISE BASIN 10/11 121    10/11 127      BIG WOOD BASIN 8/9 137    8/9 149      LITTLE WOOD BASIN 4/5 132    4/5 167      BIG LOST BASIN 5/5 123    5/5 163      LITTLE LOST 3/3 110    3/3 155      BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS 4/4 92    4/4 144      HENRYS FORK, TETON BASINS 8/8 106    8/8 149      SNAKE BASIN ABOVE PALISADES 21/21 131    21/21 160      WILLOW, BLACKFOOT, PORTNEUF BASINS 6/7 155    6/7 163      SNAKE BASIN ABOVE AMERICAN FALLS 29/29 126    29/29 157      RAFT BASIN 2/2 140    2/2 147      GOOSE CREEK BASIN 2/2 122    2/2 125      SALMON FALLS BASIN 4/6 115    4/6 132      BRUNEAU BASIN 5/8 139    5/8 156      OWYHEE BASIN 8/12 163    9/12 153      BEAR RIVER BASIN 21/21 168    21/21 171    MONTANA   KOOTENAI RIVER BASIN 8/8 71    8/8 109      FLATHEAD RIVER BASIN 14/17 78    14/17 105      UPPER CLARK FORK RIVER BASIN 14/14 72    14/14 96      BITTERROOT RIVER BASIN 8/8 76    8/8 89      LOWER CLARK FORK RIVER BASIN 9/9 69    9/9 103      JEFFERSON RIVER BASIN 19/21 78    19/21 109      MADISON RIVER BASIN 11/12 86    11/12 131      GALLATIN RIVER BASIN 7/7 77    7/7 118      MISSOURI HEADWATERS 31/31 82    31/31 117      HELENA VALLEY 4/4 78    4/4 104      SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS 7/9 52    7/9 92      SUN, TETON AND MARIAS RIVER BASINS 5/6 81    5/6 98      MISSOURI MAINSTEM RIVER BASIN 18/21 70    18/21 98      ST. MARYS RIVER BASIN 2/2 78    2/2 103      MILK RIVER BASIN 1/1 88    1/1 175      UPPER YELLOWSTONE RIVER BASIN 21/22 98    21/22 122      WIND RIVER BASIN (WYOMING) 11/13 153    11/13 165      SHOSHONE RIVER BASIN (WYOMING) 6/6 124    6/6 159      BIGHORN RIVER BASIN (WYOMING) 24/26 128    24/26 145      TONGUE RIVER BASIN (WYOMING) 7/7 109    7/7 110      POWDER RIVER BASIN (WYOMING) 7/7 95    7/7 102      LOWER YELLOWSTONE RIVER BASIN 33/35 125    33/35 137    NEVADA   NORTHERN GREAT BASIN 7/8 147    7/8 156      SNAKE RIVER 7/11 133    7/11 145      OWYHEE RIVER 6/10 169    7/10 161      UPPER HUMBOLDT RIVER 10/17 165    10/17 165      LOWER HUMBOLDT RIVER 6/10 159    7/10 173      CLOVER VALLEY & FRANKLIN RIVER 6/7 170    5/7 167      EASTERN NEVADA BASINS 5/14 159    5/14 149      SOUTHERN NEVADA - Spring Mountains 3/3 248    3/3 227    NEW MEXICO   RIO CHAMA RIVER BASIN 4/5 207    4/5 166      UPPER RIO GRANDE BASIN - New Mexico 10/12 155    10/12 121      SANGRE DE CRISTO MOUNTAIN RANGE BASINS 10/11 153    10/11 125      JEMEZ RIVER BASIN 3/4 149    3/4 123      SAN FRANCISCO RIVER BASIN 6/6 108    5/6 148      GILA RIVER BASIN 3/3 139    3/3 166      MIMBRES RIVER BASIN 2/2 167    2/2 145      PECOS RIVER BASIN 3/3 112    3/3 113      SAN JUAN RIVER BASIN 13/13 169    13/13 136      ANIMAS RIVER BASIN 7/7 171    7/7 139      CANADIAN RIVER BASIN 6/7 152    6/7 112      ZUNI/BLUEWATER RIVER BASIN 1/1 143    1/1 185      RIO HONDO BASIN 1/1 100    1/1 131      CHUSKA MOUNTAINS 2/2 174    2/2 138    OREGON   OWYHEE 8/12 163    9/12 153      MALHEUR 3/3 135    3/3 129      GRANDE RONDE, POWDER, BURNT, IMNAHA 19/19 107    19/19 110      UMATILLA, WALLA WALLA, WILLOW 10/10 120    10/10 107      JOHN DAY 13/13 144    13/13 124      UPPER DESCHUTES, CROOKED 14/14 136    14/14 120      HOOD, SANDY, LOWER DESCHUTES 9/10 123    9/10 98      COAST RANGE 2/2 8500*   2/2 128      WILLAMETTE 21/23 145    21/23 115      ROGUE, UMPQUA 12/13 150    12/13 139      KLAMATH 18/20 136    18/20 135      LAKE COUNTY, GOOSE LAKE 6/7 134    6/7 148      HARNEY 11/12 146    11/12 135    UTAH   RAFT RIVER 2/2 140    2/2 147      BEAR RIVER 25/26 170    25/26 172      WEBER-OGDEN RIVERS 20/23 168    20/23 158      PROVO R.-UTAH LAKE-JORDAN R. 19/25 168    19/25 152      TOOELE VALLEY-VERNON CREEK 3/4 170    3/4 142      NORTHEASTERN UINTAHS 11/13 156    11/13 129      DUCHESNE RIVER 14/15 205    14/15 179      PRICE-SAN RAFAEL 8/14 191    8/14 165      DIRTY DEVIL 5/9 169    5/9 142      SOUTH EASTERN UTAH 5/11 184    5/11 146      UPPER SEVIER RIVER 17/23 164    18/23 133      SAN PITCH RIVER 6/12 178    6/12 155      LOWER SEVIER RIVER 3/5 153    3/5 134      BEAVER RIVER 3/3 159    3/3 138      ESCALANTE RIVER 4/5 143    4/5 112      SOUTHWESTERN UTAH 10/13 211    10/13 160    WASHINGTON   SPOKANE 9/9 77    9/9 104      LOWER PEND OREILLE 5/5 61    5/5 111      UPPER COLUMBIA 7/9 88    7/9 105      CENTRAL COLUMBIA 11/11 76    11/11 97      UPPER YAKIMA 7/7 81    7/7 86      NACHES 8/8 81    8/8 99      LOWER YAKIMA 3/4 97    3/4 111      KLICKITAT 4/5 95    4/5 108      LOWER SNAKE, WALLA WALLA 14/14 102    14/14 106      LOWER COLUMBIA 15/17 110    15/17 115      SOUTH PUGET SOUND 13/14 88    13/14 91      CENTRAL PUGET SOUND 9/9 95    9/9 87      NORTH PUGET SOUND 12/13 86    10/13 99      OLYMPIC 4/4 98    4/4 120    WYOMING   SNAKE RIVER 22/22 128    22/22 158      MADISON HEADWATERS IN WYOMING 4/5 101    4/5 144      YELLOWSTONE HEADWATERS IN WYOMING 11/12 108    11/12 135      WIND RIVER 9/11 156    9/11 163      BIGHORN BASIN 11/11 106    11/11 114      SHOSHONE RIVER 6/6 124    6/6 159      POWDER RIVER 7/7 95    7/7 102      TONGUE RIVER 7/7 109    7/7 110      BELLE FOURCHE 3/3 102    3/3 89      CHEYENNE RIVER BASIN 2/2 100    2/2 93      UPPER N. PLATTE 19/20 129    19/20 130      SWEETWATER 3/3 224    3/3 197      LOWER N. PLATTE 4/4 106    4/4 94      LARAMIE RIVER 7/7 122    7/7 116      S. PLATTE 1/1 77    1/1 92      LITTLE SNAKE RIVER 8/9 129    8/9 122      UPPER GREEN RIVER 14/15 152    14/15 180      LOWER GREEN RIVER 10/12 154    10/12 148      UPPER BEAR RIVER 12/12 171    12/12 166

-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.