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 TUESDAY: MAY 9 , 2023
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BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION
Data Site Name (Ft) % %
Current Median Median Current Median Med
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WYOMING
SNAKE RIVER
Base Camp 7060 10.7 6.2 173 22.8 23.6 97
Blind Bull Sum 8650 25.7 24.0 107 -M 19.8 *
Cottonwood Creek 7670 20.0 15.2 132 32.2 29.0 111
East Rim Divide 7930 .9 2.2 41 13.2 13.1 101
Grand Targhee 9260 45.7 47.0 97 33.6 36.7 92
Granite Creek 6770 9.9 6.0 165 16.6 21.3 78
Grassy Lake 7265 30.2 23.4 129 43.2 39.2 110
Gros Ventre Summit 8750 9.4 10.2 92 11.8 14.9 79
Gunsight Pass 9820 12.0 12.6 95 15.3 17.0 90
Lewis Lake Divide 7850 34.0 29.4 116 43.4 37.9 115
Loomis Park 8240 11.2 8.0 140 18.2 19.4 94
Phillips Bench 8200 26.2 24.2 108 32.5 29.1 112
Salt River Summit 7640 13.5 5.0 270 22.6 18.6 122
Snake River Station 6920 8.6 3.8 226 25.1 25.4 99
Somsen Ranch 6800 10.2 .0 * 23.8 18.8 127
Spring Creek Divide 9000 -M 24.0 * -M 26.6 *
Thumb Divide 7980 14.0 8.8 159 21.3 22.1 96
Togwotee Pass 9580 22.5 25.8 87 23.9 28.4 84
Triple Peak 8500 20.0 17.2 116 28.6 29.4 97
Two Ocean Plateau 9240 33.5 33.0 102 30.8 30.4 101
Willow Creek 8080 31.9 24.3 131 41.2 38.8 106
Younts Peak 8350 8.0 12.9 62 15.1 17.6 86
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Basin Index (%) 117 101
MADISON HEADWATERS IN WYOMING
Black Bear 8170 45.9 41.0 112 47.2 41.6 113
Canyon 7870 11.6 -M * 19.7 -M *
Madison Plateau 7750 28.1 22.4 125 32.8 28.8 114
West Yellowstone 6700 3.3 .0 * 20.9 16.2 129
Whiskey Creek 6800 19.1 11.0 174 28.7 22.8 126
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Basin Index (%) 130 118
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.8 24.8 84 20.7 24.2 86
Canyon 7870 11.6 -M * 19.7 -M *
Evening Star 9200 24.2 26.9 90 31.8 32.6 98
Fisher Creek 9100 35.6 35.8 99 39.1 38.4 102
Monument Peak 8850 19.4 21.5 90 27.0 26.4 102
Northeast Entrance 7350 .0 .0 * 14.3 15.0 95
Parker Peak 9400 25.4 24.1 105 27.4 23.3 118
Sylvan Lake 8420 16.1 18.2 88 26.7 27.4 97
Thumb Divide 7980 14.0 8.8 159 21.3 22.1 96
Two Ocean Plateau 9240 33.5 33.0 102 30.8 30.4 101
White Mill 8700 25.2 26.6 95 26.3 26.1 101
Wolverine 7650 3.4 .4 850* 14.8 14.3 103
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Basin Index (%) 99 100
WIND RIVER
Burroughs Creek 8750 1.3 -M * 11.9 -M *
Castle Creek 8400 .1 .0 * 8.2 10.7 77
Cold Springs 9630 .1 1.7 6 12.1 12.0 101
Deer Park 9700 22.7 13.8 164 29.0 22.6 128
Hobbs Park 10100 16.8 15.7 107 20.1 17.4 116
Kirwin 9550 7.6 11.4 67 15.2 15.4 99
Little Warm 9370 6.2 7.8 79 15.0 14.4 104
South Pass 9040 17.9 12.4 144 23.6 19.2 123
St. Lawrence Alt 8620 .1 -M * 13.2 -M *
Togwotee Pass 9580 22.5 25.8 87 23.9 28.4 84
Townsend Creek 8700 9.7 6.2 156 17.1 14.6 117
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Basin Index (%) 109 106
BIGHORN BASIN
Bald Mtn. 9380 18.1 20.9 87 17.7 19.6 90
Bear Trap Meadow 8200 .2 .2 100* 11.5 11.7 98
Bone Springs Div 9350 14.3 17.4 82 14.7 18.8 78
Grave Springs 8550 3.3 6.5 51 12.8 12.6 102
Kirwin 9550 7.6 11.4 67 15.2 15.4 99
Marquette 8760 6.2 7.2 86 13.0 13.0 100
Middle Powder 7760 7.7 9.2 84 12.0 13.0 92
Owl Creek 8975 .0 .9 0 10.4 8.8 118
Powder River Pass 9480 4.2 9.1 46 15.7 16.4 96
Shell Creek 9580 13.8 16.9 82 16.6 17.2 97
Timber Creek 7950 .2 1.4 14 9.6 11.0 87
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Basin Index (%) 75 95
SHOSHONE RIVER
Blackwater 9780 21.6 25.9 83 25.2 26.6 95
Evening Star 9200 24.2 26.9 90 31.8 32.6 98
Marquette 8760 6.2 7.2 86 13.0 13.0 100
Sylvan Lake 8420 16.1 18.2 88 26.7 27.4 97
Sylvan Road 7120 .1 .0 * 16.4 19.0 86
Younts Peak 8350 8.0 12.9 62 15.1 17.6 86
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Basin Index (%) 84 94
POWDER RIVER
Bear Trap Meadow 8200 .2 .2 100* 11.5 11.7 98
Cloud Peak Reservoir 9860 13.5 16.2 83 17.3 18.2 95
Grave Springs 8550 3.3 6.5 51 12.8 12.6 102
Hansen Sawmill 8360 1.0 2.0 50 10.8 12.0 90
Middle Powder 7760 7.7 9.2 84 12.0 13.0 92
Powder River Pass 9480 4.2 9.1 46 15.7 16.4 96
Soldier Park 8720 3.5 .9 389 10.6 11.9 89
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Basin Index (%) 76 95
TONGUE RIVER
Big Goose 7990 6.6 8.6 77 12.5 14.4 87
Bone Springs Div 9350 14.3 17.4 82 14.7 18.8 78
Burgess Junction 7880 10.8 11.0 98 16.0 15.6 103
Dome Lake 8880 7.7 11.1 69 14.0 17.5 80
Little Goose 8870 6.5 9.6 68 14.0 16.2 86
Sucker Creek 8880 9.2 12.4 74 19.1 18.8 102
Tie Creek 6870 .3 1.0 30 14.8 15.0 99
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Basin Index (%) 78 90
BELLE FOURCHE
Blind Park 6890 .0 .0 * 12.9 14.0 92
Cole Canyon 5910 .0 .0 * 12.4 13.2 94
North Rapid Creek 6130 .5 .0 * 10.6 11.8 90
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Basin Index (%) * 92
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 12.9 14.0 92
North Rapid Creek 6130 .5 .0 * 10.6 11.8 90
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Basin Index (%) * 91
UPPER N. PLATTE
Arapaho Ridge 10976 25.4 22.4 113 28.4 26.2 108
Blackhall Mtn 9839 33.4 32.9 102 41.7 37.0 113
Cinnabar Park 9707 -M 17.4 * 25.9 27.8 93
Columbine 9167 15.6 13.6 115 30.2 30.0 101
Divide Peak 8730 21.9 13.0 168 32.3 25.4 127
Joe Wright 10158 24.4 22.4 109 31.6 32.0 99
Laprele Creek 8390 4.6 2.4 192 15.6 15.5 101
Med Bow 10512 41.2 -M * 38.9 -M *
Never Summer 10323 26.4 22.2 119 21.5 20.8 103
North French Creek 10153 28.1 31.8 88 33.5 34.2 98
Old Battle 9860 40.6 36.0 113 46.1 40.0 115
Rawah 9069 7.3 4.0 182 19.8 20.1 99
Sage Creek Basin 7850 11.1 .0 * 22.2 15.6 142
Sand Lake 10098 30.1 32.2 93 32.0 31.4 102
South Brush Creek 8495 3.4 2.0 170 17.0 17.6 97
Tower 10620 55.2 48.0 115 55.9 46.6 120
Webber Springs 9260 25.2 19.0 133 35.4 30.8 115
Whiskey Park 9020 33.9 27.3 124 39.0 34.6 113
Willow Creek Pass 9523 17.2 14.6 118 19.9 16.8 118
Zirkel 9338 20.8 20.3 102 38.0 35.4 107
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Basin Index (%) 117 109
SWEETWATER
Deer Park 9700 22.7 13.8 164 29.0 22.6 128
Larsen Creek 9000 6.0 .0 * 17.5 16.4 107
South Pass 9040 17.9 12.4 144 23.6 19.2 123
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Basin Index (%) 178 120
LOWER N. PLATTE
Casper Mtn. 7920 5.9 10.2 58 16.1 18.2 88
Laprele Creek 8390 4.6 2.4 192 15.6 15.5 101
Reno Hill 8430 12.1 12.4 98 19.6 21.1 93
Windy Peak 7915 5.0 1.2 417 14.2 14.0 101
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Basin Index (%) 105 95
LARAMIE RIVER
Brooklyn Lake 10250 19.3 21.5 90 29.0 26.6 109
Cinnabar Park 9707 -M 17.4 * 25.9 27.8 93
Crow Creek 8335 .1 .0 * 11.2 13.7 82
Deadman Hill 10239 18.5 19.4 95 21.8 22.3 98
Rawah 9069 7.3 4.0 182 19.8 20.1 99
Roach 9740 13.6 15.8 86 23.8 22.5 106
Windy Peak 7915 5.0 1.2 417 14.2 14.0 101
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Basin Index (%) 103 99
S. PLATTE
Crow Creek 8335 .1 .0 * 11.2 13.7 82
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Basin Index (%) * 82
LITTLE SNAKE RIVER
Battle Mountain 7498 2.3 .0 * 24.4 18.0 136
Divide Peak 8730 21.9 13.0 168 32.3 25.4 127
Elk River 8739 13.4 7.9 170 30.2 23.2 130
Elkhead Divide 8800 19.9 -M * 34.0 -M *
Little Snake River 8928 30.4 21.1 144 46.1 37.8 122
Old Battle 9860 40.6 36.0 113 46.1 40.0 115
Sage Creek Basin 7850 11.1 .0 * 22.2 15.6 142
Sandstone RS 8152 11.0 2.5 440 27.2 20.4 133
Whiskey Park 9020 33.9 27.3 124 39.0 34.6 113
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Basin Index (%) 153 124
UPPER GREEN RIVER
Big Sandy Opening 9080 13.6 9.6 142 18.5 15.5 119
Blind Bull Sum 8650 25.7 24.0 107 -M 19.8 *
East Rim Divide 7930 .9 2.2 41 13.2 13.1 101
Elkhart Park G.S. 9400 10.0 9.8 102 13.8 14.8 93
Gros Ventre Summit 8750 9.4 10.2 92 11.8 14.9 79
Gunsight Pass 9820 12.0 12.6 95 15.3 17.0 90
Indian Creek 9425 27.1 21.0 129 27.1 22.4 121
Kendall R.S. 7740 4.1 .0 * 14.6 15.1 97
Larsen Creek 9000 6.0 .0 * 17.5 16.4 107
Loomis Park 8240 11.2 8.0 140 18.2 19.4 94
New Fork Lake 8340 4.6 3.1 148 -M 12.8 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 7.8 4.9 159 17.9 15.7 114
Spring Creek Divide 9000 -M 24.0 * -M 26.6 *
Triple Peak 8500 20.0 17.2 116 28.6 29.4 97
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Basin Index (%) 124 101
LOWER GREEN RIVER
Blacks Fork Jct 8869 7.8 .1 7800* 16.6 14.8 112
Buck Pasture 9632 16.1 -M * 24.4 -M *
EF Blacks Fork GS 9360 6.9 4.8 144 14.1 14.3 99
Hams Fork 7840 6.4 .1 6400* 17.3 13.2 131
Henrys Fork 10182 -M -M * 17.5 -M *
Hewinta 9500 6.8 2.4 283 18.6 16.4 113
Hickerson Park 9122 2.8 .3 933* 14.2 12.8 111
Hole-in-Rock 9168 2.6 .2 1300* 13.6 12.7 107
Indian Creek 9425 27.1 21.0 129 27.1 22.4 121
Kelley R.S. 8180 16.1 8.4 192 24.8 18.9 131
Spirit Lk 10235 18.9 10.7 177 23.9 20.0 120
Steel Creek Park 10158 19.3 17.2 112 22.9 19.8 116
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Basin Index (%) 176 117
UPPER BEAR RIVER
Bear River RS 8777 3.2 .0 * 17.9 14.1 127
Bug Lake 7987 26.2 11.8 222 27.5 19.6 140
Burts Miller Ranch 8000 .2 .0 * 15.8 8.8 180
Chalk Creek #1 9171 31.1 20.3 153 34.8 26.8 130
Giveout 6930 7.3 .0 * 17.6 14.6 121
Hayden Fork 9130 13.5 4.8 281 30.7 24.0 128
Kelley R.S. 8180 16.1 8.4 192 24.8 18.9 131
Lily Lake 9133 8.8 6.5 135 19.5 19.0 103
Monte Cristo 8932 42.1 20.8 202 42.3 28.4 149
Salt River Summit 7640 13.5 5.0 270 22.6 18.6 122
Spring Creek Divide 9000 -M 24.0 * -M 26.6 *
Trial Lake 9992 33.4 21.0 159 37.6 25.8 146
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Basin Index (%) 198 133
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-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.
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-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.
