Wyoming Snow Precipitation Update
United States Natural Resources Water and Climate Center
Department of Conservation Portland, Oregon
Agriculture Service
S N O W - P R E C I P I T A T I O N U P D A T E
Based on Mountain Data from NRCS SNOTEL Sites
As of FRIDAY: MAY 12 , 2023
------------------------------------------------------------------------------
BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION
Data Site Name (Ft) % %
Current Median Median Current Median Med
------------------------------------------------------------------------------
WYOMING
SNAKE RIVER
Base Camp 7060 8.6 4.2 205 22.9 23.6 97
Blind Bull Sum 8650 25.1 24.2 104 20.5 20.4 100
Cottonwood Creek 7670 18.5 14.0 132 32.2 29.8 108
East Rim Divide 7930 -M .6 * 13.4 13.6 99
Grand Targhee 9260 45.9 46.8 98 33.6 37.2 90
Granite Creek 6770 8.0 4.5 178 16.6 21.4 78
Grassy Lake 7265 28.8 21.4 135 43.2 39.8 109
Gros Ventre Summit 8750 8.0 9.4 85 11.8 15.1 78
Gunsight Pass 9820 11.4 12.3 93 15.4 17.3 89
Lewis Lake Divide 7850 31.9 29.1 110 43.4 38.8 112
Loomis Park 8240 9.3 6.8 137 18.3 19.9 92
Phillips Bench 8200 24.9 23.1 108 32.5 30.2 108
Salt River Summit 7640 10.8 3.3 327 22.7 18.8 121
Snake River Station 6920 5.8 1.6 362* 25.0 26.0 96
Somsen Ranch 6800 7.5 .0 * 23.9 19.2 124
Spring Creek Divide 9000 28.7 23.7 121 24.0 27.0 89
Thumb Divide 7980 12.0 6.8 176 21.4 22.2 96
Togwotee Pass 9580 21.9 25.8 85 24.3 28.8 84
Triple Peak 8500 18.0 16.4 110 28.7 29.8 96
Two Ocean Plateau 9240 32.6 33.0 99 31.0 30.6 101
Willow Creek 8080 28.7 22.4 128 41.2 39.4 105
Younts Peak 8350 5.6 12.5 45 15.4 18.0 86
----- -----
Basin Index (%) 115 99
MADISON HEADWATERS IN WYOMING
Black Bear 8170 45.9 40.5 113 47.3 42.0 113
Canyon 7870 10.0 -M * 19.8 -M *
Madison Plateau 7750 28.3 21.2 133 32.9 30.1 109
West Yellowstone 6700 .4 .0 * 20.9 16.3 128
Whiskey Creek 6800 17.9 9.4 190 28.5 23.4 122
----- -----
Basin Index (%) 130 116
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.7 24.2 86 20.8 24.6 85
Canyon 7870 10.0 -M * 19.8 -M *
Evening Star 9200 23.4 26.5 88 32.0 33.2 96
Fisher Creek 9100 35.0 36.2 97 39.2 39.4 99
Monument Peak 8850 18.0 21.1 85 27.2 26.6 102
Northeast Entrance 7350 .0 .0 * 14.4 15.2 95
Parker Peak 9400 23.6 23.2 102 27.4 23.4 117
Sylvan Lake 8420 14.7 17.0 86 26.8 27.4 98
Thumb Divide 7980 12.0 6.8 176 21.4 22.2 96
Two Ocean Plateau 9240 32.6 33.0 99 31.0 30.6 101
White Mill 8700 24.7 26.6 93 26.3 26.5 99
Wolverine 7650 .5 .0 * 14.9 14.8 101
----- -----
Basin Index (%) 96 99
WIND RIVER
Burroughs Creek 8750 .7 -M * 12.0 -M *
Castle Creek 8400 .0 .0 * 8.4 10.8 78
Cold Springs 9630 .2 2.0 10 12.4 13.0 95
Deer Park 9700 21.8 14.3 152 29.2 23.2 126
Hobbs Park 10100 16.8 16.0 105 20.6 18.2 113
Kirwin 9550 7.0 11.6 60 15.6 16.0 98
Little Warm 9370 5.0 7.4 68 15.1 14.8 102
South Pass 9040 16.7 13.2 127 23.8 19.5 122
St. Lawrence Alt 8620 .1 -M * 13.4 -M *
Togwotee Pass 9580 21.9 25.8 85 24.3 28.8 84
Townsend Creek 8700 8.4 4.1 205 17.3 15.5 112
----- -----
Basin Index (%) 104 104
BIGHORN BASIN
Bald Mtn. 9380 17.6 21.2 83 18.2 19.8 92
Bear Trap Meadow 8200 .1 .2 50* 12.5 12.4 101
Bone Springs Div 9350 13.9 17.6 79 15.2 18.9 80
Grave Springs 8550 2.9 6.4 45 14.9 12.8 116
Kirwin 9550 7.0 11.6 60 15.6 16.0 98
Marquette 8760 5.0 8.3 60 13.1 14.0 94
Middle Powder 7760 5.6 8.8 64 13.9 13.4 104
Owl Creek 8975 .0 .5 0* 10.5 9.4 112
Powder River Pass 9480 2.9 9.0 32 16.4 16.8 98
Shell Creek 9580 13.8 16.7 83 17.0 17.3 98
Timber Creek 7950 .2 1.0 20 9.7 11.7 83
----- -----
Basin Index (%) 68 97
SHOSHONE RIVER
Blackwater 9780 21.8 24.0 91 25.7 26.8 96
Evening Star 9200 23.4 26.5 88 32.0 33.2 96
Marquette 8760 5.0 8.3 60 13.1 14.0 94
Sylvan Lake 8420 14.7 17.0 86 26.8 27.4 98
Sylvan Road 7120 .1 .0 * 16.6 19.1 87
Younts Peak 8350 5.6 12.5 45 15.4 18.0 86
----- -----
Basin Index (%) 80 94
POWDER RIVER
Bear Trap Meadow 8200 .1 .2 50* 12.5 12.4 101
Cloud Peak Reservoir 9860 14.0 16.0 88 18.5 18.8 98
Grave Springs 8550 2.9 6.4 45 14.9 12.8 116
Hansen Sawmill 8360 .0 1.4 0 12.1 12.3 98
Middle Powder 7760 5.6 8.8 64 13.9 13.4 104
Powder River Pass 9480 2.9 9.0 32 16.4 16.8 98
Soldier Park 8720 1.8 .7 257* 11.6 12.0 97
----- -----
Basin Index (%) 64 101
TONGUE RIVER
Big Goose 7990 5.1 8.2 62 13.4 15.7 85
Bone Springs Div 9350 13.9 17.6 79 15.2 18.9 80
Burgess Junction 7880 9.5 10.4 91 16.7 16.0 104
Dome Lake 8880 6.4 10.6 60 14.7 18.2 81
Little Goose 8870 5.1 9.4 54 15.1 16.9 89
Sucker Creek 8880 8.1 12.2 66 19.5 19.1 102
Tie Creek 6870 .1 .2 50* 15.6 15.8 99
----- -----
Basin Index (%) 70 91
BELLE FOURCHE
Blind Park 6890 .1 .0 * 13.7 14.4 95
Cole Canyon 5910 .0 .0 * 13.0 13.6 96
North Rapid Creek 6130 .2 .0 * 11.6 12.2 95
----- -----
Basin Index (%) * 95
CHEYENNE RIVER BASIN
Blind Park 6890 .1 .0 * 13.7 14.4 95
North Rapid Creek 6130 .2 .0 * 11.6 12.2 95
----- -----
Basin Index (%) * 95
UPPER N. PLATTE
Arapaho Ridge 10976 24.0 22.4 107 28.9 27.1 107
Blackhall Mtn 9839 32.2 33.3 97 42.2 38.3 110
Cinnabar Park 9707 -M 16.6 * 26.0 27.8 94
Columbine 9167 12.6 10.8 117 30.5 30.4 100
Divide Peak 8730 19.0 12.6 151 32.8 25.6 128
Joe Wright 10158 23.4 22.4 104 32.1 32.4 99
Laprele Creek 8390 2.0 .9 222* 16.0 16.0 100
Med Bow 10512 40.7 -M * 39.8 -M *
Never Summer 10323 25.7 22.2 116 22.5 21.5 105
North French Creek 10153 26.5 32.3 82 34.0 35.1 97
Old Battle 9860 40.4 37.2 109 46.4 41.2 113
Rawah 9069 5.4 3.2 169 20.3 20.2 100
Sage Creek Basin 7850 7.1 .0 * 22.6 16.1 140
Sand Lake 10098 29.7 32.1 93 33.0 31.5 105
South Brush Creek 8495 .7 .7 100* 17.3 18.6 93
Tower 10620 55.7 48.4 115 56.1 47.8 117
Webber Springs 9260 24.0 17.4 138 35.8 31.6 113
Whiskey Park 9020 34.2 26.0 132 39.2 35.2 111
Willow Creek Pass 9523 16.1 13.6 118 20.5 16.8 122
Zirkel 9338 17.2 18.8 91 38.2 35.6 107
----- -----
Basin Index (%) 112 108
SWEETWATER
Deer Park 9700 21.8 14.3 152 29.2 23.2 126
Larsen Creek 9000 4.0 .2 2000* 17.5 16.5 106
South Pass 9040 16.7 13.2 127 23.8 19.5 122
----- -----
Basin Index (%) 153 119
LOWER N. PLATTE
Casper Mtn. 7920 4.1 9.7 42 18.8 18.3 103
Laprele Creek 8390 2.0 .9 222* 16.0 16.0 100
Reno Hill 8430 10.1 9.4 107 21.0 21.2 99
Windy Peak 7915 2.0 .0 * 14.7 14.3 103
----- -----
Basin Index (%) 91 101
LARAMIE RIVER
Brooklyn Lake 10250 17.3 20.8 83 29.2 27.2 107
Cinnabar Park 9707 -M 16.6 * 26.0 27.8 94
Crow Creek 8335 .2 .0 * 11.8 13.8 86
Deadman Hill 10239 18.0 18.5 97 23.0 23.2 99
Rawah 9069 5.4 3.2 169 20.3 20.2 100
Roach 9740 11.9 14.6 82 24.5 22.8 107
Windy Peak 7915 2.0 .0 * 14.7 14.3 103
----- -----
Basin Index (%) 96 100
S. PLATTE
Crow Creek 8335 .2 .0 * 11.8 13.8 86
----- -----
Basin Index (%) * 86
LITTLE SNAKE RIVER
Battle Mountain 7498 .1 .0 * 24.5 18.4 133
Divide Peak 8730 19.0 12.6 151 32.8 25.6 128
Elk River 8739 10.2 5.0 204 30.2 23.5 129
Elkhead Divide 8800 17.3 -M * 34.1 -M *
Little Snake River 8928 28.2 20.6 137 46.5 39.0 119
Old Battle 9860 40.4 37.2 109 46.4 41.2 113
Sage Creek Basin 7850 7.1 .0 * 22.6 16.1 140
Sandstone RS 8152 7.9 .6 1317* 27.3 20.7 132
Whiskey Park 9020 34.2 26.0 132 39.2 35.2 111
----- -----
Basin Index (%) 144 123
UPPER GREEN RIVER
Big Sandy Opening 9080 12.2 9.2 133 18.5 15.8 117
Blind Bull Sum 8650 25.1 24.2 104 20.5 20.4 100
East Rim Divide 7930 -M .6 * 13.4 13.6 99
Elkhart Park G.S. 9400 9.0 9.4 96 14.0 15.1 93
Gros Ventre Summit 8750 8.0 9.4 85 11.8 15.1 78
Gunsight Pass 9820 11.4 12.3 93 15.4 17.3 89
Indian Creek 9425 25.0 21.2 118 27.2 23.2 117
Kendall R.S. 7740 1.6 .0 * 14.5 15.6 93
Larsen Creek 9000 4.0 .2 2000* 17.5 16.5 106
Loomis Park 8240 9.3 6.8 137 18.3 19.9 92
New Fork Lake 8340 2.8 2.7 104 -M 13.0 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 5.2 3.5 149 17.9 16.0 112
Spring Creek Divide 9000 28.7 23.7 121 24.0 27.0 89
Triple Peak 8500 18.0 16.4 110 28.7 29.8 96
----- -----
Basin Index (%) 115 99
LOWER GREEN RIVER
Blacks Fork Jct 8869 5.2 .0 * 16.6 15.1 110
Buck Pasture 9632 14.2 -M * 24.4 -M *
EF Blacks Fork GS 9360 4.5 3.0 150 14.1 14.4 98
Hams Fork 7840 3.8 .0 * 17.4 13.8 126
Henrys Fork 10182 -M -M * 17.5 -M *
Hewinta 9500 4.4 1.0 440* 18.5 17.0 109
Hickerson Park 9122 .1 .2 50* 14.1 13.0 108
Hole-in-Rock 9168 .2 .0 * 13.6 13.1 104
Indian Creek 9425 25.0 21.2 118 27.2 23.2 117
Kelley R.S. 8180 13.9 8.0 174 24.8 19.3 128
Spirit Lk 10235 17.4 9.6 181 23.9 20.0 120
Steel Creek Park 10158 18.2 17.8 102 22.9 20.6 111
----- -----
Basin Index (%) 152 114
UPPER BEAR RIVER
Bear River RS 8777 .3 .0 * 17.9 14.4 124
Bug Lake 7987 22.6 12.1 187 27.9 20.0 140
Burts Miller Ranch 8000 .2 .0 * 15.8 8.8 180
Chalk Creek #1 9171 29.0 19.4 149 34.8 27.7 126
Giveout 6930 4.6 .0 * 17.6 15.0 117
Hayden Fork 9130 11.7 3.8 308 30.7 24.3 126
Kelley R.S. 8180 13.9 8.0 174 24.8 19.3 128
Lily Lake 9133 6.8 5.0 136 19.5 19.8 98
Monte Cristo 8932 39.8 20.8 191 42.4 29.4 144
Salt River Summit 7640 10.8 3.3 327 22.7 18.8 121
Spring Creek Divide 9000 28.7 23.7 121 24.0 27.0 89
Trial Lake 9992 31.4 20.9 150 37.6 26.5 142
----- -----
Basin Index (%) 171 126
-----------------------------------------------------------------------------
-M = Missing data
* = Data may not provide a valid measure of conditions.
Units = inches for the Current and Median (or Average) Snow Water Equivalent and
Total Precipitation values
If the Basin Index (%) 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 Percent of Median (or Average) represents the snow water
equivalent found at selected SNOTEL sites in or near the basin compared to
the Median (or Average) value for those sites on this day.
The TOTAL PRECIPITATION Percent of Median (or Average) represents the total precipitation
(beginning October 1st) found at selected SNOTEL sites in or near the basin
compared to the Median (or Average) value for those sites on this day.
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 medians (or averages) 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.
----------------------------------------------------------------------------
-M = Missing data
* = Data may not provide a valid measure of conditions.
Units = inches for the Current and Normal Snow Water Equivalent and
Total Precipitation values
If the Basin Index (%) 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 Percent of Median represents the snow water
equivalent found at selected SNOTEL sites in or near the basin compared to
the Median value for those sites on this day.
The TOTAL PRECIPITATION Percent of Average represents the total precipitation
(beginning October 1st) found at selected SNOTEL sites in or near the basin
compared to the Average value for those sites on this day.
Contact your state water supply staff for assistance.
Medians and averages are calculated for the period 1981-2010.
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 for the day is less than 10% of the maximum
median value for the year.
* Basin - More than half of the sites within the basin are flagged with *,
preventing the calculation of a meaningful basin index.
The basin index is calculated as the sum of the valid current values
divided by the sum of the corresponding medians (for snow water equivalent)
or averages (for precipitation) and the resulting fraction multiplied by 100.
