Western US SNOTEL Snow/Precipitation Update Report

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 Monday, July 20, 2026

State River Basin	Snow Water Equivalent		Water Year-to-Date Precipitation
State River Basin	# of Sites	Percent of Median	# of Sites	Percent of Median
ALASKA
ANCHORAGE/SHIP CREEK BASIN	2/4	*	4/4	100
SUSITNA BASIN	2/5	*	4/5	125
NORTHERN KENAI MOUNTAINS	4/7	*	6/7	94
SOUTHERN KENAI	1/6	*	4/6	90
COPPER BASIN	1/3	*	2/3	106
PRINCE WILLIAM SOUND	1/7	*	3/7	102
CHENA BASIN	3/7	*	5/7	128
UPPER TANANA	2/5	*	2/5	121
KOYUKUK BASIN	1/6	*	4/6	119
CENTRAL YUKON BASIN	0/5	*	3/5	132
NORTON SOUND	0/4	*	2/4	106
KUPARUK-SAGAVANIRKTOK RIVER BASIN	0/3	*	3/3	114
NORTHWEST ARCTIC RIVER BASIN	1/1	*	1/1	97
SOUTHEAST ALASKA BASIN	1/3	*	2/3	109
ARIZONA
VERDE RIVER BASIN	9/10	*	8/10	103
SAN FRANCISCO PEAKS	1/1	*	1/1	102
CENTRAL MOGOLLON RIM	4/4	*	4/4	95
LITTLE COLORADO RIVER BASIN	11/11	*	11/11	93
SALT RIVER BASIN	9/10	*	8/10	84
SAN FRANCISCO / UPPER GILA RIVER BASIN	7/8	*	6/8	90
CHUSKA MOUNTAINS	2/2	*	2/2	72
CALIFORNIA
NORTHERN GREAT BASIN	7/8	*	7/8	88
TRUCKEE RIVER	11/12	*	11/12	105
LAKE TAHOE	11/11	*	11/11	104
CARSON RIVER	12/13	*	12/13	105
WALKER RIVER	7/8	*	7/8	100
COLORADO
GUNNISON RIVER BASIN	14/18	*	14/18	76
UPPER COLORADO RIVER BASIN	31/36	*	32/36	68
SOUTH PLATTE RIVER BASIN	20/22	*	21/22	72
LARAMIE AND NORTH PLATTE RIVER BASINS	11/12	*	12/12	76
YAMPA AND WHITE RIVER BASINS	19/22	*	21/22	75
ARKANSAS RIVER BASIN	9/11	*	11/11	64
UPPER RIO GRANDE BASIN	17/22	*	18/22	74
SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS	19/22	*	19/22	87
IDAHO
NORTHERN PANHANDLE REGION	8/10	*	9/10	99
COEUR D'ALENE-ST. JOE RIVER BASIN	7/7	*	7/7	103
CLEARWATER BASIN	16/16	*	14/16	104
SALMON BASIN	20/20	*	20/20	100
WEISER BASIN	4/4	*	4/4	89
PAYETTE BASIN	12/12	*	12/12	101
BOISE BASIN	10/11	*	10/11	94
BIG WOOD BASIN	8/9	*	8/9	94
LITTLE WOOD BASIN	4/5	*	4/5	103
BIG LOST BASIN	5/5	*	5/5	106
LITTLE LOST	3/3	*	3/3	107
BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS	4/4	*	4/4	100
HENRYS FORK, TETON BASINS	8/8	*	8/8	94
SNAKE BASIN ABOVE PALISADES	21/21	*	21/21	97
WILLOW, BLACKFOOT, PORTNEUF BASINS	6/7	*	6/7	88
SNAKE BASIN ABOVE AMERICAN FALLS	29/29	*	29/29	94
RAFT BASIN	2/2	*	2/2	80
GOOSE CREEK BASIN	2/2	*	2/2	71
SALMON FALLS BASIN	4/6	*	4/6	72
BRUNEAU BASIN	5/8	*	5/8	73
OWYHEE BASIN	8/12	*	9/12	76
BEAR RIVER BASIN	21/21	*	21/21	94
MONTANA
KOOTENAI RIVER BASIN	6/8	*	8/8	113
FLATHEAD RIVER BASIN	12/17	*	14/17	119
UPPER CLARK FORK RIVER BASIN	14/14	*	14/14	119
BITTERROOT RIVER BASIN	8/8	*	7/8	109
LOWER CLARK FORK RIVER BASIN	9/9	*	8/9	106
JEFFERSON RIVER BASIN	19/21	*	19/21	100
MADISON RIVER BASIN	12/12	*	12/12	97
GALLATIN RIVER BASIN	7/7	*	7/7	96
MISSOURI HEADWATERS	31/31	*	31/31	99
HELENA VALLEY	4/4	*	4/4	115
SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS	7/9	*	7/9	101
SUN, TETON AND MARIAS RIVER BASINS	5/6	*	5/6	135
MISSOURI MAINSTEM RIVER BASIN	18/21	*	18/21	116
ST. MARYS RIVER BASIN	2/2	*	2/2	119
MILK RIVER BASIN	1/1	*	1/1	139
UPPER YELLOWSTONE RIVER BASIN	22/22	*	22/22	103
WIND RIVER BASIN (WYOMING)	11/13	*	10/13	100
SHOSHONE RIVER BASIN (WYOMING)	6/6	*	6/6	104
BIGHORN RIVER BASIN (WYOMING)	24/26	*	23/26	95
TONGUE RIVER BASIN (WYOMING)	6/7	*	7/7	85
POWDER RIVER BASIN (WYOMING)	7/7	*	7/7	84
LOWER YELLOWSTONE RIVER BASIN	32/35	*	32/35	92
NEVADA
NORTHERN GREAT BASIN	7/8	*	7/8	88
SNAKE RIVER	7/11	*	7/11	72
OWYHEE RIVER	6/10	*	7/10	76
UPPER HUMBOLDT RIVER	9/17	*	10/17	73
LOWER HUMBOLDT RIVER	6/10	*	7/10	91
CLOVER VALLEY & FRANKLIN RIVER	5/7	*	5/7	73
EASTERN NEVADA BASINS	5/14	*	5/14	84
SOUTHERN NEVADA - Spring Mountains	3/3	*	3/3	142
NEW MEXICO
RIO CHAMA RIVER BASIN	4/5	*	4/5	73
UPPER RIO GRANDE BASIN - New Mexico	10/12	*	10/12	63
SANGRE DE CRISTO MOUNTAIN RANGE BASINS	10/11	*	10/11	61
JEMEZ RIVER BASIN	3/4	*	3/4	76
SAN FRANCISCO RIVER BASIN	5/6	*	4/6	84
GILA RIVER BASIN	3/3	*	3/3	94
MIMBRES RIVER BASIN	2/2	*	2/2	107
PECOS RIVER BASIN	3/3	*	3/3	61
SAN JUAN RIVER BASIN	12/13	*	12/13	90
ANIMAS RIVER BASIN	6/7	*	6/7	86
CANADIAN RIVER BASIN	6/7	*	6/7	56
ZUNI/BLUEWATER RIVER BASIN	1/1	*	1/1	78
RIO HONDO BASIN	1/1	*	1/1	89
CHUSKA MOUNTAINS	2/2	*	2/2	72
OREGON
OWYHEE	8/12	*	9/12	76
MALHEUR	3/3	*	3/3	80
GRANDE RONDE, POWDER, BURNT, IMNAHA	18/19	*	18/19	81
UMATILLA, WALLA WALLA, WILLOW	9/10	*	9/10	86
JOHN DAY	12/13	*	13/13	76
UPPER DESCHUTES, CROOKED	13/14	*	12/14	78
HOOD, SANDY, LOWER DESCHUTES	8/10	*	8/10	96
COAST RANGE	2/2	*	2/2	107
WILLAMETTE	20/23	*	19/23	86
ROGUE, UMPQUA	11/13	*	9/13	73
KLAMATH	16/20	*	16/20	79
LAKE COUNTY, GOOSE LAKE	5/7	*	6/7	81
HARNEY	11/12	*	11/12	86
UTAH
RAFT RIVER	2/2	*	2/2	80
BEAR RIVER	25/26	*	25/26	94
WEBER-OGDEN RIVERS	20/23	*	20/23	86
PROVO R.-UTAH LAKE-JORDAN R.	19/26	*	19/26	83
TOOELE VALLEY-VERNON CREEK	3/4	*	3/4	73
NORTHEASTERN UINTAHS	11/13	*	11/13	88
DUCHESNE RIVER	14/15	*	14/15	95
PRICE-SAN RAFAEL	8/14	*	8/14	82
DIRTY DEVIL	5/9	*	5/9	72
SOUTH EASTERN UTAH	5/12	*	5/12	92
UPPER SEVIER RIVER	17/23	*	18/23	81
SAN PITCH RIVER	6/12	*	6/12	76
LOWER SEVIER RIVER	3/5	*	3/5	72
BEAVER RIVER	3/3	*	2/3	73
ESCALANTE RIVER	4/5	*	4/5	79
SOUTHWESTERN UTAH	10/13	*	10/13	107
WASHINGTON
SPOKANE	9/9	*	9/9	101
LOWER PEND OREILLE	5/5	*	5/5	94
UPPER COLUMBIA	7/9	*	7/9	102
CENTRAL COLUMBIA	9/11	*	10/11	112
UPPER YAKIMA	6/7	*	7/7	107
NACHES	8/8	*	7/8	107
LOWER YAKIMA	1/4	*	2/4	94
KLICKITAT	2/5	*	3/5	94
LOWER SNAKE, WALLA WALLA	13/14	*	13/14	82
LOWER COLUMBIA	12/17	*	13/17	102
SOUTH PUGET SOUND	12/14	*	11/14	107
CENTRAL PUGET SOUND	8/9	*	8/9	107
NORTH PUGET SOUND	12/13	*	11/13	109
OLYMPIC	4/4	*	4/4	90
WYOMING
SNAKE RIVER	22/22	*	22/22	96
MADISON HEADWATERS IN WYOMING	5/5	*	5/5	98
YELLOWSTONE HEADWATERS IN WYOMING	12/12	*	12/12	108
WIND RIVER	9/11	*	8/11	99
BIGHORN BASIN	11/11	*	11/11	83
SHOSHONE RIVER	6/6	*	6/6	104
POWDER RIVER	7/7	*	7/7	84
TONGUE RIVER	6/7	*	7/7	85
BELLE FOURCHE	3/3	*	3/3	81
CHEYENNE RIVER BASIN	2/2	*	2/2	83
UPPER N. PLATTE	17/20	*	19/20	78
SWEETWATER	3/3	*	3/3	89
LOWER N. PLATTE	4/4	*	4/4	76
LARAMIE RIVER	7/7	*	7/7	75
S. PLATTE	1/1	*	1/1	73
LITTLE SNAKE RIVER	7/9	*	8/9	80
UPPER GREEN RIVER	14/15	*	14/15	94
LOWER GREEN RIVER	10/12	*	10/12	90
UPPER BEAR RIVER	12/12	*	12/12	92

-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.