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: APRIL 21 , 2020
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BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION
Data Site Name (Ft) % %
Current Median Median Current Average Avg
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WYOMING
SNAKE RIVER
Base Camp 7060 15.9 11.7 136 20.1 21.8 92
Black Bear 8170 -M 36.9 * 33.8 40.0 84
Blind Bull Sum 8650 28.5 24.1 118 17.3 20.3 85
Cottonwood Creek 7670 25.7 18.3 140 31.0 26.0 119
East Rim Divide 7930 11.4 9.4 121 11.3 12.3 92
Grand Targhee 9260 45.7 42.2 108 29.7 32.8 91
Granite Creek 6770 18.8 10.5 179 18.1 20.4 89
Grassy Lake 7265 33.9 31.1 109 35.4 37.6 94
Gros Ventre Summit 8750 13.4 13.2 102 13.9 13.8 101
Gunsight Pass 9820 14.4 13.7 105 14.6 15.0 97
Lewis Lake Divide 7850 29.1 30.5 95 33.2 37.0 90
Phillips Bench 8200 -M 25.4 * -M 29.3 *
Salt River Summit 7640 15.2 9.4 162 17.1 17.4 98
Snake River Station 6920 16.6 11.1 150 22.9 23.6 97
Spring Creek Divide 9000 28.0 23.5 119 26.5 24.9 106
Thumb Divide 7980 17.9 14.4 124 17.9 19.8 90
Togwotee Pass 9580 29.6 24.0 123 29.0 25.8 112
Two Ocean Plateau 9240 33.9 28.3 120 27.9 28.7 97
Willow Creek 8080 39.8 26.7 149 38.5 35.4 109
Younts Peak 8350 18.4 15.2 121 15.7 16.7 94
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Basin Index (%) 122 97
MADISON-GALLATIN
Black Bear 8170 -M 36.9 * 33.8 40.0 84
Canyon 7870 15.4 12.2 126 16.1 17.1 94
Madison Plateau 7750 23.0 22.9 100 20.6 27.6 75
West Yellowstone 6700 7.7 7.0 110 9.6 15.2 63
Whiskey Creek 6800 16.1 15.4 105 18.4 21.3 86
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Basin Index (%) 108 81
YELLOWSTONE
Beartooth Lake 9360 25.1 23.5 107 23.5 20.8 113
Burnt Mtn 5880 9.0 .0 * 16.7 14.4 116
Canyon 7870 15.4 12.2 126 16.1 17.1 94
Cole Creek 7850 20.6 16.4 126 15.9 14.7 108
Evening Star 9200 29.6 24.7 120 32.3 28.9 112
Fisher Creek 9100 34.7 32.6 106 35.5 33.5 106
Northeast Entrance 7350 9.8 6.4 153 13.4 13.0 103
Parker Peak 9400 28.8 21.1 136 25.7 18.8 137
Sylvan Lake 8420 23.0 20.4 113 25.7 23.7 108
Thumb Divide 7980 17.9 14.4 124 17.9 19.8 90
Two Ocean Plateau 9240 33.9 28.3 120 27.9 28.7 97
White Mill 8700 28.3 23.7 119 23.5 25.0 94
Wolverine 7650 12.8 6.9 186 14.3 12.9 111
Younts Peak 8350 18.4 15.2 121 15.7 16.7 94
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Basin Index (%) 125 106
WIND RIVER
Burroughs Creek 8750 14.5 -M * 15.0 -M *
Castle Creek 8400 5.4 -M * 8.1 -M *
Cold Springs 9630 8.2 4.3 191 9.0 11.0 82
Deer Park 9700 15.7 16.3 96 15.9 21.7 73
Hobbs Park 10100 15.5 14.9 104 14.5 14.9 97
Kirwin 9550 12.9 10.0 129 12.2 12.5 98
Little Warm 9370 13.1 10.0 131 11.2 14.0 80
Owl Creek 8975 6.9 3.7 186 8.5 6.9 123
South Pass 9040 13.5 15.4 88 13.5 18.7 72
St. Lawrence Alt 8620 5.4 5.2 104 9.1 10.0 91
Togwotee Pass 9580 29.6 24.0 123 29.0 25.8 112
Townsend Creek 8700 11.1 9.3 119 12.4 13.4 93
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Basin Index (%) 117 91
BIGHORN BASIN
Bald Mtn. 9380 22.4 19.9 113 18.1 18.3 99
Bear Trap Meadow 8200 8.4 2.9 290 10.4 9.5 109
Bone Springs Div 9350 19.0 16.1 118 16.2 16.9 96
Grave Springs 8550 10.1 9.5 106 10.9 11.8 92
Kirwin 9550 12.9 10.0 129 12.2 12.5 98
Marquette 8760 9.4 -M * 10.7 -M *
Middle Powder 7760 13.3 12.4 107 12.6 12.9 98
Owl Creek 8975 6.9 3.7 186 8.5 6.9 123
Powder River Pass 9480 12.8 10.2 125 14.1 13.8 102
Shell Creek 9580 16.8 15.4 109 15.4 14.9 103
Timber Creek 7950 6.1 4.6 133 8.4 8.5 99
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Basin Index (%) 123 101
SHOSHONE RIVER
Blackwater 9780 25.4 23.8 107 25.5 21.9 116
Evening Star 9200 29.6 24.7 120 32.3 28.9 112
Marquette 8760 9.4 -M * 10.7 -M *
Sylvan Lake 8420 23.0 20.4 113 25.7 23.7 108
Sylvan Road 7120 9.6 9.5 101 -M 17.7 *
Younts Peak 8350 18.4 15.2 121 15.7 16.7 94
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Basin Index (%) 113 109
POWDER RIVER
Bear Trap Meadow 8200 8.4 2.9 290 10.4 9.5 109
Cloud Peak Reservoir 9860 16.1 15.9 101 15.2 15.0 101
Grave Springs 8550 10.1 9.5 106 10.9 11.8 92
Hansen Sawmill 8360 8.1 4.6 176 10.2 9.7 105
Middle Powder 7760 13.3 12.4 107 12.6 12.9 98
Powder River Pass 9480 12.8 10.2 125 14.1 13.8 102
Soldier Park 8720 7.7 -M * 10.2 -M *
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Basin Index (%) 124 101
TONGUE RIVER
Big Goose 7990 10.0 9.2 109 11.1 12.8 87
Bone Springs Div 9350 19.0 16.1 118 16.2 16.9 96
Burgess Junction 7880 12.8 12.6 102 13.7 13.6 101
Dome Lake 8880 15.0 11.8 127 11.4 15.0 76
Little Goose 8870 12.6 -M * 9.5 -M *
Sucker Creek 8880 14.9 12.7 117 14.7 15.9 92
Tie Creek 6870 8.0 4.2 190 14.0 13.0 108
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Basin Index (%) 120 93
BELLE FOURCHE
Blind Park 6890 4.5 4.0 112 9.3 13.2 70
Cole Canyon 5910 -M 1.8 * -M 10.5 *
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Basin Index (%) 112 70
CHEYENNE RIVER BASIN
Blind Park 6890 4.5 4.0 112 9.3 13.2 70
North Rapid Creek 6130 5.9 4.0 148 9.3 11.2 83
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Basin Index (%) 130 76
UPPER N. PLATTE
Arapaho Ridge 10960 24.0 21.3 113 24.0 24.4 98
Blackhall Mtn 9820 33.1 -M * 31.8 -M *
Columbine 9160 29.3 20.6 142 30.8 27.0 114
Divide Peak 8880 22.4 18.6 120 23.3 22.9 102
Joe Wright 10120 23.9 22.4 107 29.5 27.9 106
Laprele Creek 8375 11.8 7.8 151 13.9 13.8 101
Med Bow 10500 45.1 -M * 38.3 -M *
Never Summer 10280 21.8 20.7 105 16.8 -M *
North French Creek 10130 35.6 32.0 111 34.6 28.7 121
Old Battle 10000 34.3 32.9 104 32.5 37.2 87
Rawah 9020 11.2 8.3 135 16.1 15.6 103
Sage Creek Basin 7850 13.0 5.4 241 13.3 15.3 87
Sand Lake 10050 32.2 30.6 105 29.4 27.0 109
South Brush Creek 8440 11.8 9.7 122 14.3 16.5 87
Tower 10500 47.8 48.2 99 45.5 42.3 108
Webber Springs 9250 23.4 21.8 107 27.6 28.5 97
Whiskey Park 8950 34.5 25.8 134 33.7 29.7 113
Willow Creek Pass 9540 15.5 13.3 117 14.6 14.5 101
Zirkel 9340 -M 22.6 * -M 29.8 *
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Basin Index (%) 116 103
SWEETWATER
Deer Park 9700 15.7 16.3 96 15.9 21.7 73
Larsen Creek 9000 6.1 10.2 60 10.5 -M *
South Pass 9040 13.5 15.4 88 13.5 18.7 72
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Basin Index (%) 84 73
LOWER N. PLATTE
Casper Mtn. 7900 16.6 14.4 115 12.5 16.7 75
Laprele Creek 8375 11.8 7.8 151 13.9 13.8 101
Reno Hill 8400 18.2 14.0 130 18.7 17.3 108
Windy Peak 7900 10.1 6.5 155 9.9 11.7 85
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Basin Index (%) 133 92
LARAMIE RIVER
Brooklyn Lake 10240 30.5 22.3 137 29.6 22.9 129
Cinnabar Park 9574 24.8 20.0 124 28.5 25.4 112
Crow Creek 8330 7.8 .3 2600* 12.8 12.0 107
Deadman Hill 10220 21.6 17.2 126 19.2 19.0 101
Rawah 9020 11.2 8.3 135 16.1 15.6 103
Roach 9700 17.0 16.6 102 18.4 20.7 89
Windy Peak 7900 10.1 6.5 155 9.9 11.7 85
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Basin Index (%) 135 106
S. PLATTE
Black Mountain 8920 12.2 -M * 15.8 -M *
Crow Creek 8330 7.8 .3 2600* 12.8 12.0 107
Deadman Hill 10220 21.6 17.2 126 19.2 19.0 101
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Basin Index (%) 168* 103
LITTLE SNAKE RIVER
Battle Mountain 7440 8.9 3.9 228 15.2 16.1 94
Divide Peak 8880 22.4 18.6 120 23.3 22.9 102
Elk River 8700 20.6 15.2 136 19.5 21.4 91
Little Snake River 8915 28.9 24.1 120 34.7 31.2 111
Old Battle 10000 34.3 32.9 104 32.5 37.2 87
Sage Creek Basin 7850 13.0 5.4 241 13.3 15.3 87
Sandstone RS 8150 15.4 10.0 154 17.5 19.6 89
Whiskey Park 8950 34.5 25.8 134 33.7 29.7 113
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Basin Index (%) 131 98
UPPER GREEN RIVER
Big Sandy Opening 9080 11.2 12.6 89 10.0 14.2 70
Blind Bull Sum 8650 28.5 24.1 118 17.3 20.3 85
East Rim Divide 7930 11.4 9.4 121 11.3 12.3 92
Elkhart Park G.S. 9400 10.9 11.9 92 11.1 14.1 79
Gros Ventre Summit 8750 13.4 13.2 102 13.9 13.8 101
Gunsight Pass 9820 14.4 13.7 105 14.6 15.0 97
Indian Creek 9425 24.7 23.4 106 17.8 23.7 75
Kendall R.S. 7740 10.5 8.1 130 12.8 14.8 86
Loomis Park 8240 15.5 12.8 121 20.1 18.0 112
New Fork Lake 8340 10.1 8.6 117 10.0 11.3 88
Pocket Creek 9360 -M -M * 9.3 -M *
Snider Basin 8060 11.5 10.6 108 14.9 14.8 101
Spring Creek Divide 9000 28.0 23.5 119 26.5 24.9 106
Triple Peak 8500 29.8 19.2 155 28.5 26.5 108
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Basin Index (%) 115 93
LOWER GREEN RIVER
Blacks Fork Jct 8869 8.2 -M * 13.3 -M *
Buck Pasture 9632 18.8 -M * 19.1 -M *
EF Blacks Fork GS 9360 14.8 -M * 13.4 -M *
Hams Fork 7840 10.2 6.4 159 12.3 12.1 102
Hewinta 9500 13.8 7.9 175 16.2 15.0 108
Hickerson Park 9122 10.2 5.3 192 12.4 11.1 112
Hole-in-Rock 9168 10.3 5.7 181 12.4 10.6 117
Indian Creek 9425 24.7 23.4 106 17.8 23.7 75
Kelley R.S. 8180 16.0 12.4 129 17.3 19.0 91
Spirit Lk 10235 17.9 -M * 19.3 -M *
Steel Creek Park 10158 19.0 16.2 117 19.9 17.8 112
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Basin Index (%) 135 99
UPPER BEAR RIVER
Bear River RS 8777 7.9 -M * 12.6 -M *
Bug Lake 7987 19.2 16.9 114 19.5 20.5 95
Burts Miller Ranch 8000 .7 -M * 7.8 -M *
Chalk Creek #1 9171 21.8 24.5 89 20.7 26.9 77
Hayden Fork 9130 16.7 11.4 146 22.2 22.5 99
Kelley R.S. 8180 16.0 12.4 129 17.3 19.0 91
Lily Lake 9133 12.8 10.4 123 14.0 18.4 76
Monte Cristo 8932 30.0 27.4 109 27.5 27.5 100
Salt River Summit 7640 15.2 9.4 162 17.1 17.4 98
Spring Creek Divide 9000 28.0 23.5 119 26.5 24.9 106
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Basin Index (%) 118 93
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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.
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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.