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 THURSDAY: APRIL 23 , 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 15.3 11.3 135 20.0 22.0 91
Black Bear 8170 -M 36.8 * 33.9 40.3 84
Blind Bull Sum 8650 28.5 24.3 117 17.3 20.5 84
Cottonwood Creek 7670 24.9 17.8 140 31.2 26.2 119
East Rim Divide 7930 9.9 9.3 106 11.4 12.3 93
Grand Targhee 9260 46.0 42.7 108 32.9 33.0 100
Granite Creek 6770 18.0 10.0 180 18.2 20.5 89
Grassy Lake 7265 32.9 30.6 108 35.5 37.8 94
Gros Ventre Summit 8750 13.2 12.9 102 14.0 13.9 101
Gunsight Pass 9820 14.0 13.6 103 14.6 15.2 96
Lewis Lake Divide 7850 28.3 30.7 92 33.2 37.2 89
Phillips Bench 8200 -M 25.3 * -M 29.5 *
Salt River Summit 7640 14.0 8.9 157 17.2 17.6 98
Snake River Station 6920 15.3 10.9 140 22.9 23.8 96
Spring Creek Divide 9000 28.5 23.6 121 26.6 25.2 106
Thumb Divide 7980 17.0 14.3 119 17.9 20.0 90
Togwotee Pass 9580 28.9 24.3 119 29.0 26.0 112
Two Ocean Plateau 9240 34.3 28.7 120 27.9 28.9 97
Willow Creek 8080 39.3 26.4 149 38.6 35.8 108
Younts Peak 8350 18.3 15.1 121 15.9 16.9 94
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Basin Index (%) 120 97
MADISON-GALLATIN
Black Bear 8170 -M 36.8 * 33.9 40.3 84
Canyon 7870 15.0 12.0 125 16.1 17.2 94
Madison Plateau 7750 22.4 22.8 98 20.6 27.8 74
West Yellowstone 6700 6.1 6.0 102 9.5 15.3 62
Whiskey Creek 6800 15.4 15.4 100 18.4 21.5 86
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Basin Index (%) 105 81
YELLOWSTONE
Beartooth Lake 9360 25.0 23.6 106 23.6 21.0 112
Burnt Mtn 5880 8.1 .0 * 16.6 14.5 114
Canyon 7870 15.0 12.0 125 16.1 17.2 94
Cole Creek 7850 20.4 16.4 124 15.9 14.9 107
Evening Star 9200 29.2 24.4 120 32.3 29.1 111
Fisher Creek 9100 35.0 33.0 106 35.6 33.8 105
Northeast Entrance 7350 8.5 5.7 149 13.4 13.1 102
Parker Peak 9400 29.2 21.4 136 25.7 19.1 135
Sylvan Lake 8420 22.1 20.3 109 25.7 24.0 107
Thumb Divide 7980 17.0 14.3 119 17.9 20.0 90
Two Ocean Plateau 9240 34.3 28.7 120 27.9 28.9 97
White Mill 8700 28.0 23.7 118 23.5 25.2 93
Wolverine 7650 12.0 6.2 194 14.3 13.1 109
Younts Peak 8350 18.3 15.1 121 15.9 16.9 94
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Basin Index (%) 123 105
WIND RIVER
Burroughs Creek 8750 13.8 -M * 15.2 -M *
Castle Creek 8400 4.4 -M * 8.2 -M *
Cold Springs 9630 7.3 3.9 187 9.1 11.3 81
Deer Park 9700 15.0 16.4 91 15.9 22.1 72
Hobbs Park 10100 15.3 15.3 100 14.5 15.3 95
Kirwin 9550 12.9 10.1 128 12.3 12.8 96
Little Warm 9370 12.4 9.9 125 11.3 14.2 80
Owl Creek 8975 5.5 3.2 172 8.6 7.1 121
South Pass 9040 12.7 15.3 83 13.4 19.0 71
St. Lawrence Alt 8620 4.6 5.1 90 9.1 10.3 88
Togwotee Pass 9580 28.9 24.3 119 29.0 26.0 112
Townsend Creek 8700 11.1 9.0 123 12.5 13.7 91
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Basin Index (%) 112 89
BIGHORN BASIN
Bald Mtn. 9380 22.2 20.1 110 18.1 18.5 98
Bear Trap Meadow 8200 7.3 2.5 292 10.5 9.7 108
Bone Springs Div 9350 18.4 16.3 113 16.2 17.1 95
Grave Springs 8550 9.9 9.4 105 11.0 11.9 92
Kirwin 9550 12.9 10.1 128 12.3 12.8 96
Marquette 8760 9.2 -M * 10.7 -M *
Middle Powder 7760 12.8 12.4 103 12.6 13.1 96
Owl Creek 8975 5.5 3.2 172 8.6 7.1 121
Powder River Pass 9480 12.3 10.2 121 14.2 14.0 101
Shell Creek 9580 16.4 15.7 104 15.5 15.1 103
Timber Creek 7950 5.0 4.2 119 8.4 8.8 95
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Basin Index (%) 118 99
SHOSHONE RIVER
Blackwater 9780 25.4 24.1 105 25.6 22.2 115
Evening Star 9200 29.2 24.4 120 32.3 29.1 111
Marquette 8760 9.2 -M * 10.7 -M *
Sylvan Lake 8420 22.1 20.3 109 25.7 24.0 107
Sylvan Road 7120 7.8 8.9 88 18.2 17.8 102
Younts Peak 8350 18.3 15.1 121 15.9 16.9 94
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Basin Index (%) 111 107
POWDER RIVER
Bear Trap Meadow 8200 7.3 2.5 292 10.5 9.7 108
Cloud Peak Reservoir 9860 15.2 16.1 94 15.3 15.3 100
Grave Springs 8550 9.9 9.4 105 11.0 11.9 92
Hansen Sawmill 8360 7.6 4.5 169 10.2 9.9 103
Middle Powder 7760 12.8 12.4 103 12.6 13.1 96
Powder River Pass 9480 12.3 10.2 121 14.2 14.0 101
Soldier Park 8720 7.1 -M * 10.2 -M *
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Basin Index (%) 118 100
TONGUE RIVER
Big Goose 7990 9.8 9.2 107 11.0 13.1 84
Bone Springs Div 9350 18.4 16.3 113 16.2 17.1 95
Burgess Junction 7880 12.3 12.6 98 13.6 13.7 99
Dome Lake 8880 13.4 11.8 114 11.4 15.2 75
Little Goose 8870 12.1 -M * -M -M *
Sucker Creek 8880 14.3 12.7 113 14.9 16.1 93
Tie Creek 6870 7.2 3.9 185 14.0 13.3 105
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Basin Index (%) 113 92
BELLE FOURCHE
Blind Park 6890 2.9 3.9 74 9.2 13.4 69
Cole Canyon 5910 -M 1.4 * -M 10.7 *
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Basin Index (%) 74 69
CHEYENNE RIVER BASIN
Blind Park 6890 2.9 3.9 74 9.2 13.4 69
North Rapid Creek 6130 4.9 3.9 126 9.2 11.4 81
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Basin Index (%) 100 74
UPPER N. PLATTE
Arapaho Ridge 10960 23.9 21.5 111 24.0 24.7 97
Blackhall Mtn 9820 32.9 -M * 31.8 -M *
Columbine 9160 28.1 20.7 136 31.0 27.3 114
Divide Peak 8880 21.7 18.3 119 23.3 23.2 100
Joe Wright 10120 24.1 22.7 106 29.6 28.3 105
Laprele Creek 8375 10.5 7.4 142 13.9 14.0 99
Med Bow 10500 45.9 -M * 38.2 -M *
Never Summer 10280 -M 20.9 * -M -M *
North French Creek 10130 35.7 32.2 111 34.7 29.1 119
Old Battle 10000 34.2 33.5 102 32.6 37.5 87
Rawah 9020 10.7 8.1 132 16.1 15.8 102
Sage Creek Basin 7850 11.6 4.2 276 13.3 15.4 86
Sand Lake 10050 32.2 30.7 105 29.4 27.3 108
South Brush Creek 8440 10.8 9.8 110 14.3 16.7 86
Tower 10500 44.9 48.8 92 45.6 42.9 106
Webber Springs 9250 23.2 21.8 106 27.6 28.8 96
Whiskey Park 8950 33.8 25.6 132 33.7 30.1 112
Willow Creek Pass 9540 15.3 13.5 113 14.6 14.7 99
Zirkel 9340 -M 22.5 * -M 30.0 *
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Basin Index (%) 113 102
SWEETWATER
Deer Park 9700 15.0 16.4 91 15.9 22.1 72
Larsen Creek 9000 4.7 10.0 47 10.6 -M *
South Pass 9040 12.7 15.3 83 13.4 19.0 71
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Basin Index (%) 78 71
LOWER N. PLATTE
Casper Mtn. 7900 15.8 14.2 111 12.5 16.9 74
Laprele Creek 8375 10.5 7.4 142 13.9 14.0 99
Reno Hill 8400 17.8 14.0 127 18.8 17.5 107
Windy Peak 7900 9.0 6.3 143 10.1 12.0 84
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Basin Index (%) 127 92
LARAMIE RIVER
Brooklyn Lake 10240 30.1 22.5 134 29.6 23.3 127
Cinnabar Park 9574 24.7 19.9 124 28.6 25.8 111
Crow Creek 8330 6.8 .2 3400* 12.8 12.2 105
Deadman Hill 10220 21.6 17.7 122 19.3 19.4 99
Rawah 9020 10.7 8.1 132 16.1 15.8 102
Roach 9700 16.8 16.7 101 18.5 21.0 88
Windy Peak 7900 9.0 6.3 143 10.1 12.0 84
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Basin Index (%) 131 104
S. PLATTE
Black Mountain 8920 11.4 -M * 15.8 -M *
Crow Creek 8330 6.8 .2 3400* 12.8 12.2 105
Deadman Hill 10220 21.6 17.7 122 19.3 19.4 99
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Basin Index (%) 159* 102
LITTLE SNAKE RIVER
Battle Mountain 7440 7.7 2.9 266 15.2 16.3 93
Divide Peak 8880 21.7 18.3 119 23.3 23.2 100
Elk River 8700 19.1 14.8 129 19.5 21.7 90
Little Snake River 8915 28.0 23.6 119 34.8 31.3 111
Old Battle 10000 34.2 33.5 102 32.6 37.5 87
Sage Creek Basin 7850 11.6 4.2 276 13.3 15.4 86
Sandstone RS 8150 13.6 9.6 142 17.5 19.8 88
Whiskey Park 8950 33.8 25.6 132 33.7 30.1 112
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Basin Index (%) 128 97
UPPER GREEN RIVER
Big Sandy Opening 9080 10.5 12.3 85 10.1 14.4 70
Blind Bull Sum 8650 28.5 24.3 117 17.3 20.5 84
East Rim Divide 7930 9.9 9.3 106 11.4 12.3 93
Elkhart Park G.S. 9400 10.7 11.8 91 11.3 14.3 79
Gros Ventre Summit 8750 13.2 12.9 102 14.0 13.9 101
Gunsight Pass 9820 14.0 13.6 103 14.6 15.2 96
Indian Creek 9425 24.5 23.5 104 17.8 24.0 74
Kendall R.S. 7740 9.6 7.3 132 12.9 14.9 87
Loomis Park 8240 14.8 12.3 120 20.2 18.2 111
New Fork Lake 8340 9.0 8.1 111 10.3 11.5 90
Pocket Creek 9360 -M -M * 9.4 -M *
Snider Basin 8060 10.6 10.4 102 15.0 15.0 100
Spring Creek Divide 9000 28.5 23.6 121 26.6 25.2 106
Triple Peak 8500 28.6 19.2 149 28.5 26.7 107
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Basin Index (%) 113 93
LOWER GREEN RIVER
Blacks Fork Jct 8869 7.8 -M * 13.3 -M *
Buck Pasture 9632 18.1 -M * 19.1 -M *
EF Blacks Fork GS 9360 14.2 -M * 13.4 -M *
Hams Fork 7840 8.4 5.7 147 12.4 12.3 101
Hewinta 9500 12.4 7.4 168 16.2 15.3 106
Hickerson Park 9122 9.3 5.1 182 12.4 11.3 110
Hole-in-Rock 9168 9.7 5.5 176 12.5 10.8 116
Indian Creek 9425 24.5 23.5 104 17.8 24.0 74
Kelley R.S. 8180 14.7 12.0 122 17.4 19.3 90
Spirit Lk 10235 17.6 -M * 19.3 -M *
Steel Creek Park 10158 18.9 16.4 115 19.9 18.1 110
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Basin Index (%) 129 98
UPPER BEAR RIVER
Bear River RS 8777 6.5 -M * 12.6 -M *
Bug Lake 7987 18.4 16.4 112 19.6 20.7 95
Burts Miller Ranch 8000 .1 -M * 7.8 -M *
Chalk Creek #1 9171 21.2 24.5 87 20.8 27.2 76
Hayden Fork 9130 15.2 11.0 138 22.2 22.7 98
Kelley R.S. 8180 14.7 12.0 122 17.4 19.3 90
Lily Lake 9133 12.1 10.1 120 14.0 18.6 75
Monte Cristo 8932 28.9 27.3 106 27.5 27.9 99
Salt River Summit 7640 14.0 8.9 157 17.2 17.6 98
Spring Creek Divide 9000 28.5 23.6 121 26.6 25.2 106
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Basin Index (%) 114 92
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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.