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 Wednesday, February 01, 2017

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	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	2/5	60	2/5	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	12/13	190	12/13	233
WALKER RIVER	7/8	195	7/8	226
COLORADO
GUNNISON RIVER BASIN	15/18	170	15/18	143
UPPER COLORADO RIVER BASIN	32/36	147	32/36	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	17/22	162	18/22	126
SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS	20/22	179	20/22	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	12/12	88	12/12	133
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	22/22	99	22/22	123
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	11/13	142
KLAMATH	17/20	138	17/20	138
LAKE COUNTY, GOOSE LAKE	5/7	139	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.	19/26	168	19/26	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	5/12	184	5/12	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	100	3/4	111
KLICKITAT	4/5	97	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	5/5	103	5/5	147
YELLOWSTONE HEADWATERS IN WYOMING	12/12	108	12/12	137
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.