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 1 , 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 13.0 9.3 140 21.2 22.8 93
Black Bear 8170 -M 37.4 * 35.2 41.7 84
Blind Bull Sum 8650 29.1 23.1 126 18.1 21.3 85
Cottonwood Creek 7670 22.8 15.3 149 32.9 27.5 120
East Rim Divide 7930 4.5 8.2 55 11.8 12.9 91
Grand Targhee 9260 -M 44.8 * 34.6 34.6 100
Granite Creek 6770 14.5 8.3 175 -M 21.3 *
Grassy Lake 7265 29.1 29.1 100 36.7 39.3 93
Gros Ventre Summit 8750 13.7 11.6 118 15.2 14.6 104
Gunsight Pass 9820 14.7 12.5 118 16.0 16.0 100
Lewis Lake Divide 7850 25.6 30.1 85 34.4 38.5 89
Phillips Bench 8200 29.5 25.4 116 33.3 30.7 108
Salt River Summit 7640 8.7 7.9 110 17.7 18.4 96
Snake River Station 6920 11.9 7.4 161 23.7 24.7 96
Spring Creek Divide 9000 27.4 24.3 113 27.3 26.2 104
Thumb Divide 7980 13.5 12.4 109 18.7 20.9 89
Togwotee Pass 9580 29.1 24.7 118 30.4 27.2 112
Two Ocean Plateau 9240 32.6 29.7 110 29.0 30.1 96
Willow Creek 8080 36.2 23.0 157 40.8 37.5 109
Younts Peak 8350 14.2 15.5 92 16.7 17.6 95
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Basin Index (%) 116 98
MADISON-GALLATIN
Black Bear 8170 -M 37.4 * 35.2 41.7 84
Canyon 7870 13.6 10.4 131 17.2 18.0 96
Madison Plateau 7750 19.8 21.3 93 22.0 28.9 76
West Yellowstone 6700 .4 1.8 22 10.3 16.0 64
Whiskey Creek 6800 13.3 14.6 91 19.6 22.3 88
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Basin Index (%) 98 82
YELLOWSTONE
Beartooth Lake 9360 24.8 22.8 109 24.2 21.9 111
Burnt Mtn 5880 2.2 .0 * 15.9 15.9 100
Canyon 7870 13.6 10.4 131 17.2 18.0 96
Cole Creek 7850 18.6 16.6 112 16.0 16.4 98
Evening Star 9200 27.7 24.9 111 33.4 30.4 110
Fisher Creek 9100 34.2 32.7 105 37.3 35.1 106
Northeast Entrance 7350 4.8 3.0 160 14.6 13.8 106
Parker Peak 9400 29.9 21.3 140 26.5 20.0 132
Sylvan Lake 8420 19.6 19.8 99 27.1 25.1 108
Thumb Divide 7980 13.5 12.4 109 18.7 20.9 89
Two Ocean Plateau 9240 32.6 29.7 110 29.0 30.1 96
White Mill 8700 30.8 23.8 129 24.6 26.3 94
Wolverine 7650 7.1 2.5 284 14.9 13.7 109
Younts Peak 8350 14.2 15.5 92 16.7 17.6 95
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Basin Index (%) 116 104
WIND RIVER
Burroughs Creek 8750 10.0 -M * 15.7 -M *
Castle Creek 8400 .0 -M * 8.4 -M *
Cold Springs 9630 3.4 1.3 262 9.3 12.4 75
Deer Park 9700 11.6 16.0 72 16.1 23.4 69
Hobbs Park 10100 14.1 16.0 88 14.6 16.6 88
Kirwin 9550 11.9 10.4 114 12.6 13.8 91
Little Warm 9370 11.6 8.7 133 12.1 15.3 79
Owl Creek 8975 .4 1.0 40 8.7 7.9 110
South Pass 9040 10.4 14.9 70 13.5 20.3 67
St. Lawrence Alt 8620 .1 2.5 4 9.4 11.5 82
Togwotee Pass 9580 29.1 24.7 118 30.4 27.2 112
Townsend Creek 8700 8.7 7.5 116 12.6 14.9 85
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Basin Index (%) 98 85
BIGHORN BASIN
Bald Mtn. 9380 22.1 20.5 108 18.6 19.7 94
Bear Trap Meadow 8200 2.9 .9 322 10.7 10.6 101
Bone Springs Div 9350 19.2 16.5 116 16.6 18.2 91
Grave Springs 8550 7.7 9.4 82 11.0 12.8 86
Kirwin 9550 11.9 10.4 114 12.6 13.8 91
Marquette 8760 7.2 -M * 11.0 -M *
Middle Powder 7760 10.6 11.6 91 12.9 14.1 91
Owl Creek 8975 .4 1.0 40 8.7 7.9 110
Powder River Pass 9480 11.1 9.4 118 14.8 15.1 98
Shell Creek 9580 16.8 15.9 106 15.6 16.3 96
Timber Creek 7950 .5 3.1 16 8.4 9.9 85
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Basin Index (%) 105 94
SHOSHONE RIVER
Blackwater 9780 26.0 25.3 103 26.7 23.4 114
Evening Star 9200 27.7 24.9 111 33.4 30.4 110
Marquette 8760 7.2 -M * 11.0 -M *
Sylvan Lake 8420 19.6 19.8 99 27.1 25.1 108
Sylvan Road 7120 2.3 5.8 40 18.3 18.6 98
Younts Peak 8350 14.2 15.5 92 16.7 17.6 95
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Basin Index (%) 98 106
POWDER RIVER
Bear Trap Meadow 8200 2.9 .9 322 10.7 10.6 101
Cloud Peak Reservoir 9860 14.7 16.5 89 15.6 16.6 94
Grave Springs 8550 7.7 9.4 82 11.0 12.8 86
Hansen Sawmill 8360 4.4 2.5 176 10.6 10.8 98
Middle Powder 7760 10.6 11.6 91 12.9 14.1 91
Powder River Pass 9480 11.1 9.4 118 14.8 15.1 98
Soldier Park 8720 3.5 -M * 10.5 -M *
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Basin Index (%) 102 94
TONGUE RIVER
Big Goose 7990 8.2 9.2 89 11.3 14.0 81
Bone Springs Div 9350 19.2 16.5 116 16.6 18.2 91
Burgess Junction 7880 11.8 12.1 98 13.7 14.8 93
Dome Lake 8880 12.9 11.4 113 12.0 16.4 73
Little Goose 8870 9.9 -M * -M -M *
Sucker Creek 8880 12.7 12.2 104 15.2 17.3 88
Tie Creek 6870 3.0 2.7 111 14.2 14.3 99
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Basin Index (%) 106 87
BELLE FOURCHE
Blind Park 6890 -M .8 * 9.7 14.3 68
Cole Canyon 5910 -M .3 * -M 11.8 *
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Basin Index (%) * 68
CHEYENNE RIVER BASIN
Blind Park 6890 -M .8 * 9.7 14.3 68
North Rapid Creek 6130 .0 .8 0 9.3 12.2 76
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Basin Index (%) 0 72
UPPER N. PLATTE
Arapaho Ridge 10960 23.3 22.3 104 25.5 26.2 97
Blackhall Mtn 9820 30.8 -M * 32.7 -M *
Columbine 9160 23.5 18.2 129 33.0 28.5 116
Divide Peak 8880 15.7 18.0 87 24.1 24.3 99
Joe Wright 10120 24.3 23.3 104 30.9 29.8 104
Laprele Creek 8375 7.3 6.1 120 14.4 15.0 96
Med Bow 10500 45.0 -M * 39.6 -M *
Never Summer 10280 22.8 21.8 105 18.5 -M *
North French Creek 10130 35.6 32.9 108 35.8 30.7 117
Old Battle 10000 33.8 34.7 97 33.3 39.2 85
Rawah 9020 8.2 6.1 134 16.8 17.2 98
Sage Creek Basin 7850 4.5 1.1 409* 13.5 16.1 84
Sand Lake 10050 33.2 31.4 106 30.7 29.0 106
South Brush Creek 8440 6.1 9.2 66 14.7 17.8 83
Tower 10500 46.0 50.0 92 47.5 44.7 106
Webber Springs 9250 19.8 21.7 91 28.5 29.9 95
Whiskey Park 8950 28.3 26.5 107 34.5 31.5 110
Willow Creek Pass 9540 15.2 14.2 107 15.7 15.8 99
Zirkel 9340 21.8 21.0 104 35.0 31.0 113
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Basin Index (%) 103 102
SWEETWATER
Deer Park 9700 11.6 16.0 72 16.1 23.4 69
Larsen Creek 9000 .2 9.2 2 10.9 -M *
South Pass 9040 10.4 14.9 70 13.5 20.3 67
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Basin Index (%) 55 68
LOWER N. PLATTE
Casper Mtn. 7900 13.1 13.3 98 13.7 17.9 77
Laprele Creek 8375 7.3 6.1 120 14.4 15.0 96
Reno Hill 8400 16.1 12.6 128 19.9 18.9 105
Windy Peak 7900 5.0 4.0 125 11.1 13.0 85
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Basin Index (%) 115 91
LARAMIE RIVER
Brooklyn Lake 10240 28.5 23.3 122 30.6 24.7 124
Cinnabar Park 9574 22.1 19.4 114 29.2 26.9 109
Crow Creek 8330 .2 .0 * 13.3 13.4 99
Deadman Hill 10220 20.0 19.0 105 19.7 20.6 96
Rawah 9020 8.2 6.1 134 16.8 17.2 98
Roach 9700 13.7 17.2 80 19.0 22.2 86
Windy Peak 7900 5.0 4.0 125 11.1 13.0 85
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Basin Index (%) 110 101
S. PLATTE
Black Mountain 8920 7.8 -M * 16.4 -M *
Crow Creek 8330 .2 .0 * 13.3 13.4 99
Deadman Hill 10220 20.0 19.0 105 19.7 20.6 96
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Basin Index (%) 106* 97
LITTLE SNAKE RIVER
Battle Mountain 7440 1.0 .0 * 15.7 17.1 92
Divide Peak 8880 15.7 18.0 87 24.1 24.3 99
Elk River 8700 12.6 13.2 95 20.0 22.7 88
Little Snake River 8915 23.0 22.3 103 35.8 32.7 109
Old Battle 10000 33.8 34.7 97 33.3 39.2 85
Sage Creek Basin 7850 4.5 1.1 409* 13.5 16.1 84
Sandstone RS 8150 7.8 5.9 132 17.6 20.8 85
Whiskey Park 8950 28.3 26.5 107 34.5 31.5 110
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Basin Index (%) 104 95
UPPER GREEN RIVER
Big Sandy Opening 9080 8.2 10.6 77 10.4 15.1 69
Blind Bull Sum 8650 29.1 23.1 126 18.1 21.3 85
East Rim Divide 7930 4.5 8.2 55 11.8 12.9 91
Elkhart Park G.S. 9400 9.3 11.3 82 11.9 15.0 79
Gros Ventre Summit 8750 13.7 11.6 118 15.2 14.6 104
Gunsight Pass 9820 14.7 12.5 118 16.0 16.0 100
Indian Creek 9425 20.6 23.0 90 18.2 25.0 73
Kendall R.S. 7740 6.3 4.3 147 13.8 15.5 89
Loomis Park 8240 12.3 11.0 112 21.2 18.9 112
New Fork Lake 8340 6.2 6.5 95 -M 12.1 *
Pocket Creek 9360 -M -M * 9.8 -M *
Snider Basin 8060 4.5 9.4 48 15.3 15.6 98
Spring Creek Divide 9000 27.4 24.3 113 27.3 26.2 104
Triple Peak 8500 24.1 17.5 138 30.2 27.9 108
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Basin Index (%) 104 93
LOWER GREEN RIVER
Blacks Fork Jct 8869 2.5 -M * 13.5 -M *
Buck Pasture 9632 13.3 -M * 19.4 -M *
EF Blacks Fork GS 9360 8.5 -M * 13.7 -M *
Hams Fork 7840 2.3 2.9 79 13.0 13.1 99
Hewinta 9500 5.4 4.8 112 16.3 16.1 101
Hickerson Park 9122 3.6 4.2 86 12.4 12.0 103
Hole-in-Rock 9168 3.2 2.5 128 12.6 11.4 111
Indian Creek 9425 20.6 23.0 90 18.2 25.0 73
Kelley R.S. 8180 10.2 11.5 89 17.8 20.2 88
Spirit Lk 10235 14.2 -M * 19.4 -M *
Steel Creek Park 10158 16.4 17.1 96 20.1 19.1 105
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Basin Index (%) 93 94
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 12.6 -M *
Bug Lake 7987 13.1 15.1 87 19.8 21.7 91
Burts Miller Ranch 8000 .0 -M * 7.8 -M *
Chalk Creek #1 9171 16.4 24.2 68 21.0 28.4 74
Hayden Fork 9130 7.9 9.3 85 22.5 23.8 95
Kelley R.S. 8180 10.2 11.5 89 17.8 20.2 88
Lily Lake 9133 7.2 9.9 73 14.1 19.5 72
Monte Cristo 8932 23.6 26.5 89 28.0 29.2 96
Salt River Summit 7640 8.7 7.9 110 17.7 18.4 96
Spring Creek Divide 9000 27.4 24.3 113 27.3 26.2 104
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Basin Index (%) 89 90
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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.