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 MONDAY: APRIL 20 , 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 16.7 11.9 140 20.1 21.7 93
Black Bear 8170 -M 36.9 * 33.8 39.8 85
Blind Bull Sum 8650 28.4 24.0 118 17.3 20.2 86
Cottonwood Creek 7670 25.5 18.6 137 31.0 25.8 120
East Rim Divide 7930 11.7 9.5 123 11.3 12.2 93
Grand Targhee 9260 45.6 42.0 109 29.6 32.6 91
Granite Creek 6770 18.9 10.8 175 18.1 20.3 89
Grassy Lake 7265 34.4 31.3 110 35.4 37.3 95
Gros Ventre Summit 8750 13.4 13.2 102 13.9 13.7 101
Gunsight Pass 9820 14.3 13.6 105 14.6 14.9 98
Lewis Lake Divide 7850 29.4 30.4 97 33.3 36.8 90
Phillips Bench 8200 -M 25.6 * -M 29.2 *
Salt River Summit 7640 15.3 9.7 158 17.1 17.4 98
Snake River Station 6920 17.3 11.3 153 22.9 23.5 97
Spring Creek Divide 9000 28.1 23.5 120 26.5 24.7 107
Thumb Divide 7980 18.0 14.5 124 17.9 19.7 91
Togwotee Pass 9580 29.6 23.8 124 29.0 25.7 113
Two Ocean Plateau 9240 34.0 28.1 121 27.8 28.5 98
Willow Creek 8080 40.0 26.8 149 38.5 35.3 109
Younts Peak 8350 18.4 15.1 122 15.8 16.6 95
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Basin Index (%) 123 97
MADISON-GALLATIN
Black Bear 8170 -M 36.9 * 33.8 39.8 85
Canyon 7870 15.5 12.2 127 16.1 17.0 95
Madison Plateau 7750 23.2 22.9 101 20.6 27.5 75
West Yellowstone 6700 8.5 7.4 115 9.6 15.1 64
Whiskey Creek 6800 16.3 15.3 107 18.4 21.2 87
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Basin Index (%) 110 82
YELLOWSTONE
Beartooth Lake 9360 25.0 23.4 107 23.5 20.8 113
Burnt Mtn 5880 9.3 .0 * 16.8 14.2 118
Canyon 7870 15.5 12.2 127 16.1 17.0 95
Cole Creek 7850 20.7 16.3 127 15.9 14.5 110
Evening Star 9200 29.7 24.8 120 32.3 28.7 113
Fisher Creek 9100 34.6 32.4 107 35.5 33.3 107
Northeast Entrance 7350 10.0 6.7 149 13.4 13.0 103
Parker Peak 9400 -M 20.9 * -M 18.7 *
Sylvan Lake 8420 23.3 20.4 114 25.7 23.6 109
Thumb Divide 7980 18.0 14.5 124 17.9 19.7 91
Two Ocean Plateau 9240 34.0 28.1 121 27.8 28.5 98
White Mill 8700 28.2 23.7 119 23.5 24.9 94
Wolverine 7650 12.7 7.2 176 14.3 12.8 112
Younts Peak 8350 18.4 15.1 122 15.8 16.6 95
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Basin Index (%) 124 104
WIND RIVER
Burroughs Creek 8750 14.4 -M * 15.1 -M *
Castle Creek 8400 5.8 -M * 8.0 -M *
Cold Springs 9630 8.4 4.6 183 9.0 10.9 83
Deer Park 9700 15.8 16.3 97 15.8 21.5 73
Hobbs Park 10100 15.6 14.8 105 14.4 14.8 97
Kirwin 9550 12.9 10.0 129 12.2 12.4 98
Little Warm 9370 13.2 10.1 131 11.2 13.9 81
Owl Creek 8975 7.0 4.0 175 8.5 6.9 123
South Pass 9040 13.5 15.5 87 13.4 18.6 72
St. Lawrence Alt 8620 5.5 5.3 104 9.0 9.9 91
Togwotee Pass 9580 29.6 23.8 124 29.0 25.7 113
Townsend Creek 8700 11.2 9.4 119 12.4 13.3 93
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Basin Index (%) 117 91
BIGHORN BASIN
Bald Mtn. 9380 22.4 19.8 113 17.9 18.2 98
Bear Trap Meadow 8200 8.5 3.2 266 10.4 9.4 111
Bone Springs Div 9350 19.8 16.1 123 16.1 16.7 96
Grave Springs 8550 10.2 9.6 106 11.0 11.7 94
Kirwin 9550 12.9 10.0 129 12.2 12.4 98
Marquette 8760 9.4 -M * 10.7 -M *
Middle Powder 7760 13.4 12.5 107 12.6 12.8 98
Owl Creek 8975 7.0 4.0 175 8.5 6.9 123
Powder River Pass 9480 12.7 10.2 125 14.1 13.7 103
Shell Creek 9580 16.6 15.4 108 15.3 14.8 103
Timber Creek 7950 6.3 4.8 131 8.4 8.4 100
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Basin Index (%) 123 101
SHOSHONE RIVER
Blackwater 9780 25.4 23.8 107 25.4 21.8 117
Evening Star 9200 29.7 24.8 120 32.3 28.7 113
Marquette 8760 9.4 -M * 10.7 -M *
Sylvan Lake 8420 23.3 20.4 114 25.7 23.6 109
Sylvan Road 7120 10.6 9.8 108 -M 17.6 *
Younts Peak 8350 18.4 15.1 122 15.8 16.6 95
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Basin Index (%) 114 109
POWDER RIVER
Bear Trap Meadow 8200 8.5 3.2 266 10.4 9.4 111
Cloud Peak Reservoir 9860 15.9 15.8 101 15.2 14.9 102
Grave Springs 8550 10.2 9.6 106 11.0 11.7 94
Hansen Sawmill 8360 8.3 4.8 173 10.2 9.5 107
Middle Powder 7760 13.4 12.5 107 12.6 12.8 98
Powder River Pass 9480 12.7 10.2 125 14.1 13.7 103
Soldier Park 8720 7.9 -M * 10.1 -M *
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Basin Index (%) 123 102
TONGUE RIVER
Big Goose 7990 9.9 9.3 106 11.0 12.6 87
Bone Springs Div 9350 19.8 16.1 123 16.1 16.7 96
Burgess Junction 7880 12.7 12.5 102 13.6 13.4 101
Dome Lake 8880 15.1 11.8 128 11.3 14.9 76
Little Goose 8870 12.5 -M * 9.5 -M *
Sucker Creek 8880 14.8 12.7 117 14.6 15.8 92
Tie Creek 6870 8.3 4.4 189 14.0 12.8 109
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Basin Index (%) 121 94
BELLE FOURCHE
Blind Park 6890 4.6 4.1 112 9.3 13.1 71
Cole Canyon 5910 -M 2.0 * -M 10.4 *
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Basin Index (%) 112 71
CHEYENNE RIVER BASIN
Blind Park 6890 4.6 4.1 112 9.3 13.1 71
North Rapid Creek 6130 6.1 4.2 145 9.3 11.0 85
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Basin Index (%) 129 77
UPPER N. PLATTE
Arapaho Ridge 10960 23.9 21.4 112 24.0 24.3 99
Blackhall Mtn 9820 33.0 -M * 31.8 -M *
Columbine 9160 29.3 20.6 142 31.0 26.9 115
Divide Peak 8880 22.0 18.9 116 23.3 22.8 102
Joe Wright 10120 23.8 22.2 107 29.5 27.7 106
Laprele Creek 8375 12.0 8.0 150 13.9 13.7 101
Med Bow 10500 45.2 -M * 38.3 -M *
Never Summer 10280 -M 20.7 * -M -M *
North French Creek 10130 35.5 32.0 111 34.5 28.6 121
Old Battle 10000 34.3 32.7 105 32.3 37.0 87
Rawah 9020 11.3 8.4 135 16.1 15.5 104
Sage Creek Basin 7850 12.9 6.0 215 13.3 15.3 87
Sand Lake 10050 32.1 30.5 105 29.2 26.8 109
South Brush Creek 8440 11.8 9.8 120 14.4 16.5 87
Tower 10500 48.8 48.0 102 45.3 42.1 108
Webber Springs 9250 23.3 22.0 106 27.5 28.4 97
Whiskey Park 8950 34.4 25.9 133 33.7 29.6 114
Willow Creek Pass 9540 15.4 13.1 118 14.6 14.4 101
Zirkel 9340 -M 22.7 * -M 29.7 *
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Basin Index (%) 116 104
SWEETWATER
Deer Park 9700 15.8 16.3 97 15.8 21.5 73
Larsen Creek 9000 6.6 10.3 64 10.5 -M *
South Pass 9040 13.5 15.5 87 13.4 18.6 72
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Basin Index (%) 85 73
LOWER N. PLATTE
Casper Mtn. 7900 16.8 14.4 117 12.6 16.6 76
Laprele Creek 8375 12.0 8.0 150 13.9 13.7 101
Reno Hill 8400 18.1 13.9 130 18.7 17.2 109
Windy Peak 7900 10.3 6.6 156 9.8 11.6 84
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Basin Index (%) 133 93
LARAMIE RIVER
Brooklyn Lake 10240 30.4 22.2 137 29.5 22.8 129
Cinnabar Park 9574 25.0 20.1 124 28.6 25.3 113
Crow Creek 8330 8.2 .7 1171* 12.8 12.0 107
Deadman Hill 10220 21.4 17.0 126 19.3 18.9 102
Rawah 9020 11.3 8.4 135 16.1 15.5 104
Roach 9700 17.0 16.6 102 18.3 20.6 89
Windy Peak 7900 10.3 6.6 156 9.8 11.6 84
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Basin Index (%) 135 106
S. PLATTE
Black Mountain 8920 12.7 -M * 15.8 -M *
Crow Creek 8330 8.2 .7 1171* 12.8 12.0 107
Deadman Hill 10220 21.4 17.0 126 19.3 18.9 102
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Basin Index (%) 167* 104
LITTLE SNAKE RIVER
Battle Mountain 7440 9.4 4.3 219 15.2 16.1 94
Divide Peak 8880 22.0 18.9 116 23.3 22.8 102
Elk River 8700 20.5 15.5 132 19.4 21.3 91
Little Snake River 8915 28.9 24.3 119 34.8 31.2 112
Old Battle 10000 34.3 32.7 105 32.3 37.0 87
Sage Creek Basin 7850 12.9 6.0 215 13.3 15.3 87
Sandstone RS 8150 16.0 10.1 158 17.5 19.5 90
Whiskey Park 8950 34.4 25.9 133 33.7 29.6 114
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Basin Index (%) 130 98
UPPER GREEN RIVER
Big Sandy Opening 9080 11.2 12.7 88 10.0 14.1 71
Blind Bull Sum 8650 28.4 24.0 118 17.3 20.2 86
East Rim Divide 7930 11.7 9.5 123 11.3 12.2 93
Elkhart Park G.S. 9400 11.0 11.9 92 11.1 14.0 79
Gros Ventre Summit 8750 13.4 13.2 102 13.9 13.7 101
Gunsight Pass 9820 14.3 13.6 105 14.6 14.9 98
Indian Creek 9425 24.6 23.3 106 17.7 23.5 75
Kendall R.S. 7740 10.7 8.4 127 12.8 14.8 86
Loomis Park 8240 15.7 13.0 121 20.1 18.0 112
New Fork Lake 8340 10.6 8.8 120 -M 11.3 *
Pocket Creek 9360 -M -M * 9.4 -M *
Snider Basin 8060 12.3 10.7 115 14.9 14.8 101
Spring Creek Divide 9000 28.1 23.5 120 26.5 24.7 107
Triple Peak 8500 29.8 19.3 154 28.5 26.3 108
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Basin Index (%) 116 94
LOWER GREEN RIVER
Blacks Fork Jct 8869 8.1 -M * 13.3 -M *
Buck Pasture 9632 18.8 -M * 19.1 -M *
EF Blacks Fork GS 9360 15.1 -M * 13.3 -M *
Hams Fork 7840 11.0 6.7 164 12.3 12.0 102
Hewinta 9500 13.6 8.1 168 16.2 15.0 108
Hickerson Park 9122 10.3 5.4 191 12.4 11.0 113
Hole-in-Rock 9168 10.5 5.9 178 12.4 10.5 118
Indian Creek 9425 24.6 23.3 106 17.7 23.5 75
Kelley R.S. 8180 16.0 12.7 126 17.3 18.9 92
Spirit Lk 10235 18.0 -M * 19.2 -M *
Steel Creek Park 10158 19.0 16.2 117 19.9 17.7 112
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Basin Index (%) 134 100
UPPER BEAR RIVER
Bear River RS 8777 8.6 -M * 12.6 -M *
Bug Lake 7987 19.1 17.2 111 19.6 20.4 96
Burts Miller Ranch 8000 1.7 -M * 7.8 -M *
Chalk Creek #1 9171 21.7 24.6 88 20.7 26.7 78
Hayden Fork 9130 17.5 11.8 148 22.2 22.4 99
Kelley R.S. 8180 16.0 12.7 126 17.3 18.9 92
Lily Lake 9133 12.9 10.6 122 14.0 18.3 77
Monte Cristo 8932 30.0 27.5 109 27.5 27.3 101
Salt River Summit 7640 15.3 9.7 158 17.1 17.4 98
Spring Creek Divide 9000 28.1 23.5 120 26.5 24.7 107
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Basin Index (%) 117 94
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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.