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, December 15, 2025

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	4/4	64	4/4	90
SUSITNA BASIN	2/5	28	4/5	78
NORTHERN KENAI MOUNTAINS	6/7	85	6/7	111
SOUTHERN KENAI	3/6	72	5/6	82
COPPER BASIN	2/3	89	2/3	114
PRINCE WILLIAM SOUND	1/7	22	2/7	88
CHENA BASIN	6/7	122	6/7	179
UPPER TANANA	2/5	85	2/5	130
KOYUKUK BASIN	2/6	50	4/6	132
CENTRAL YUKON BASIN	0/5	*	3/5	162
NORTON SOUND	0/4	*	2/4	119
KUPARUK-SAGAVANIRKTOK RIVER BASIN	0/3	*	3/3	119
NORTHWEST ARCTIC RIVER BASIN	1/1	43	1/1	148
SOUTHEAST ALASKA BASIN	1/3	83	2/3	110
ARIZONA
VERDE RIVER BASIN	9/10	12	8/10	204
SAN FRANCISCO PEAKS	1/1	169	1/1	193
CENTRAL MOGOLLON RIM	4/4	0	4/4	231
LITTLE COLORADO RIVER BASIN	11/11	55	11/11	173
SALT RIVER BASIN	9/10	9	8/10	128
SAN FRANCISCO / UPPER GILA RIVER BASIN	8/8	32	7/8	97
CHUSKA MOUNTAINS	2/2	29	2/2	98
CALIFORNIA
NORTHERN GREAT BASIN	7/8	7	7/8	91
TRUCKEE RIVER	11/12	16	11/12	91
LAKE TAHOE	11/11	17	11/11	88
CARSON RIVER	12/13	15	12/13	99
WALKER RIVER	7/8	32	7/8	101
COLORADO
GUNNISON RIVER BASIN	15/18	61	15/18	105
UPPER COLORADO RIVER BASIN	32/36	55	32/36	79
SOUTH PLATTE RIVER BASIN	21/22	66	21/22	76
LARAMIE AND NORTH PLATTE RIVER BASINS	12/12	69	12/12	83
YAMPA AND WHITE RIVER BASINS	20/22	68	21/22	91
ARKANSAS RIVER BASIN	11/11	69	11/11	102
UPPER RIO GRANDE BASIN	17/22	67	18/22	127
SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS	19/22	63	19/22	136
IDAHO
NORTHERN PANHANDLE REGION	10/10	56	8/10	129
COEUR D'ALENE-ST. JOE RIVER BASIN	7/7	52	7/7	131
CLEARWATER BASIN	15/16	60	14/16	127
SALMON BASIN	20/20	57	20/20	94
WEISER BASIN	4/4	14	4/4	84
PAYETTE BASIN	12/12	34	12/12	90
BOISE BASIN	10/11	50	10/11	79
BIG WOOD BASIN	8/9	54	8/9	75
LITTLE WOOD BASIN	4/5	53	4/5	77
BIG LOST BASIN	5/5	55	5/5	80
LITTLE LOST	3/3	53	3/3	90
BIRCH, MEDICINE LODGE, BEAVER, CAMAS BASINS	4/4	45	4/4	101
HENRYS FORK, TETON BASINS	8/8	62	8/8	91
SNAKE BASIN ABOVE PALISADES	21/21	78	21/21	111
WILLOW, BLACKFOOT, PORTNEUF BASINS	6/7	49	6/7	110
SNAKE BASIN ABOVE AMERICAN FALLS	29/29	70	29/29	103
RAFT BASIN	2/2	48	2/2	72
GOOSE CREEK BASIN	2/2	58	2/2	83
SALMON FALLS BASIN	4/6	60	4/6	94
BRUNEAU BASIN	5/8	62	5/8	97
OWYHEE BASIN	8/12	29	9/12	81
BEAR RIVER BASIN	21/21	61	21/21	104
MONTANA
KOOTENAI RIVER BASIN	8/8	75	8/8	151
FLATHEAD RIVER BASIN	14/17	125	14/17	153
UPPER CLARK FORK RIVER BASIN	14/14	116	14/14	142
BITTERROOT RIVER BASIN	8/8	77	8/8	133
LOWER CLARK FORK RIVER BASIN	9/9	77	9/9	140
JEFFERSON RIVER BASIN	19/21	67	19/21	107
MADISON RIVER BASIN	12/12	62	12/12	94
GALLATIN RIVER BASIN	7/7	87	7/7	117
MISSOURI HEADWATERS	31/31	68	31/31	106
HELENA VALLEY	4/4	96	4/4	137
SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS	7/9	110	7/9	122
SUN, TETON AND MARIAS RIVER BASINS	5/6	98	5/6	170
MISSOURI MAINSTEM RIVER BASIN	18/21	103	18/21	143
ST. MARYS RIVER BASIN	2/2	95	2/2	146
MILK RIVER BASIN	1/1	200	1/1	155
UPPER YELLOWSTONE RIVER BASIN	22/22	91	22/22	121
WIND RIVER BASIN (WYOMING)	11/13	62	11/13	109
SHOSHONE RIVER BASIN (WYOMING)	6/6	79	6/6	123
BIGHORN RIVER BASIN (WYOMING)	24/26	75	24/26	120
TONGUE RIVER BASIN (WYOMING)	7/7	65	7/7	114
POWDER RIVER BASIN (WYOMING)	7/7	73	7/7	142
LOWER YELLOWSTONE RIVER BASIN	33/35	72	33/35	119
NEVADA
NORTHERN GREAT BASIN	7/8	7	7/8	91
SNAKE RIVER	7/11	61	7/11	92
OWYHEE RIVER	6/10	37	7/10	83
UPPER HUMBOLDT RIVER	9/17	39	10/17	84
LOWER HUMBOLDT RIVER	6/10	17	7/10	92
CLOVER VALLEY & FRANKLIN RIVER	5/7	25	5/7	78
EASTERN NEVADA BASINS	5/14	33	5/14	80
SOUTHERN NEVADA - Spring Mountains	3/3	80	3/3	191
NEW MEXICO
RIO CHAMA RIVER BASIN	4/5	55	4/5	96
UPPER RIO GRANDE BASIN - New Mexico	10/12	53	10/12	72
SANGRE DE CRISTO MOUNTAIN RANGE BASINS	10/11	53	10/11	71
JEMEZ RIVER BASIN	3/4	52	3/4	95
SAN FRANCISCO RIVER BASIN	6/6	33	5/6	95
GILA RIVER BASIN	3/3	83	3/3	87
MIMBRES RIVER BASIN	2/2	6	2/2	95
PECOS RIVER BASIN	3/3	44	3/3	62
SAN JUAN RIVER BASIN	12/13	60	12/13	146
ANIMAS RIVER BASIN	6/7	59	6/7	138
CANADIAN RIVER BASIN	6/7	48	6/7	61
ZUNI/BLUEWATER RIVER BASIN	1/1	20	1/1	119
RIO HONDO BASIN	1/1	8	1/1	64
CHUSKA MOUNTAINS	2/2	29	2/2	98
OREGON
OWYHEE	8/12	29	9/12	81
MALHEUR	3/3	0	3/3	78
GRANDE RONDE, POWDER, BURNT, IMNAHA	19/19	22	19/19	91
UMATILLA, WALLA WALLA, WILLOW	10/10	11	10/10	103
JOHN DAY	13/13	4	13/13	84
UPPER DESCHUTES, CROOKED	14/14	6	14/14	64
HOOD, SANDY, LOWER DESCHUTES	9/10	2	9/10	110
COAST RANGE	2/2	33	2/2	116
WILLAMETTE	21/23	5	21/23	78
ROGUE, UMPQUA	12/13	4	11/13	53
KLAMATH	17/20	3	17/20	50
LAKE COUNTY, GOOSE LAKE	5/7	6	6/7	64
HARNEY	11/12	7	11/12	87
UTAH
RAFT RIVER	2/2	48	2/2	72
BEAR RIVER	25/26	59	25/26	104
WEBER-OGDEN RIVERS	20/23	53	20/23	96
PROVO R.-UTAH LAKE-JORDAN R.	19/26	50	19/26	91
TOOELE VALLEY-VERNON CREEK	3/4	50	3/4	100
NORTHEASTERN UINTAHS	11/13	64	11/13	93
DUCHESNE RIVER	14/15	63	14/15	99
PRICE-SAN RAFAEL	8/14	49	8/14	90
DIRTY DEVIL	5/9	54	5/9	92
SOUTH EASTERN UTAH	5/12	65	5/12	115
UPPER SEVIER RIVER	17/23	51	18/23	96
SAN PITCH RIVER	6/12	40	6/12	77
LOWER SEVIER RIVER	3/5	20	3/5	72
BEAVER RIVER	3/3	42	3/3	74
ESCALANTE RIVER	4/5	103	4/5	133
SOUTHWESTERN UTAH	10/13	52	10/13	125
WASHINGTON
SPOKANE	9/9	45	9/9	133
LOWER PEND OREILLE	5/5	51	4/5	124
UPPER COLUMBIA	7/9	113	7/9	153
CENTRAL COLUMBIA	11/11	49	11/11	141
UPPER YAKIMA	7/7	2	7/7	139
NACHES	8/8	29	7/8	129
LOWER YAKIMA	2/4	39	3/4	107
KLICKITAT	3/5	27	4/5	106
LOWER SNAKE, WALLA WALLA	14/14	27	14/14	95
LOWER COLUMBIA	15/17	13	14/17	128
SOUTH PUGET SOUND	13/14	17	12/14	140
CENTRAL PUGET SOUND	9/9	0	9/9	135
NORTH PUGET SOUND	12/13	81	11/13	138
OLYMPIC	4/4	1	4/4	95
WYOMING
SNAKE RIVER	22/22	77	22/22	110
MADISON HEADWATERS IN WYOMING	5/5	49	5/5	85
YELLOWSTONE HEADWATERS IN WYOMING	12/12	99	12/12	123
WIND RIVER	9/11	66	9/11	103
BIGHORN BASIN	11/11	76	11/11	132
SHOSHONE RIVER	6/6	79	6/6	123
POWDER RIVER	7/7	73	7/7	142
TONGUE RIVER	7/7	65	7/7	114
BELLE FOURCHE	3/3	82	3/3	173
CHEYENNE RIVER BASIN	2/2	70	2/2	162
UPPER N. PLATTE	19/20	71	19/20	91
SWEETWATER	3/3	53	3/3	76
LOWER N. PLATTE	4/4	34	4/4	94
LARAMIE RIVER	7/7	63	7/7	85
S. PLATTE	1/1	13	1/1	67
LITTLE SNAKE RIVER	8/9	76	8/9	104
UPPER GREEN RIVER	14/15	79	14/15	111
LOWER GREEN RIVER	10/12	74	10/12	106
UPPER BEAR RIVER	12/12	57	12/12	100

-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.