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 22 , 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 .0 .0 * 22.1 24.7 89
Black Bear 8170 25.7 32.7 79 38.1 44.9 85
Blind Bull Sum 8650 28.6 18.8 152 19.5 23.4 83
Cottonwood Creek 7670 8.5 4.4 193 34.3 30.3 113
East Rim Divide 7930 .1 .0 * 12.7 14.3 89
Grand Targhee 9260 38.0 41.6 91 36.4 37.1 98
Granite Creek 6770 -M .0 * 21.0 23.1 91
Grassy Lake 7265 14.9 15.4 97 38.9 42.1 92
Gros Ventre Summit 8750 4.3 4.2 102 15.9 16.3 98
Gunsight Pass 9820 9.0 9.3 97 16.9 17.8 95
Lewis Lake Divide 7850 14.1 21.0 67 36.1 41.2 88
Phillips Bench 8200 -M 17.6 * -M 33.1 *
Salt River Summit 7640 .0 .0 * 18.5 20.1 92
Snake River Station 6920 .1 .0 * 24.5 26.7 92
Spring Creek Divide 9000 19.9 19.0 105 28.7 28.3 101
Thumb Divide 7980 .6 .3 200* 19.9 22.9 87
Togwotee Pass 9580 24.5 22.8 107 32.0 29.9 107
Two Ocean Plateau 9240 31.1 28.0 111 31.4 33.1 95
Willow Creek 8080 17.4 14.7 118 43.6 41.2 106
Younts Peak 8350 .0 11.1 0 18.4 19.8 93
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Basin Index (%) 97 95
MADISON-GALLATIN
Black Bear 8170 25.7 32.7 79 38.1 44.9 85
Canyon 7870 2.9 1.1 264* 18.6 20.0 93
Madison Plateau 7750 11.4 13.3 86 24.2 31.8 76
West Yellowstone 6700 .0 .0 * 11.4 17.7 64
Whiskey Creek 6800 3.1 4.3 72 21.2 24.5 87
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Basin Index (%) 84 82
YELLOWSTONE
Beartooth Lake 9360 25.4 21.1 120 26.6 24.3 109
Burnt Mtn 5880 .0 .0 * 18.0 19.3 93
Canyon 7870 2.9 1.1 264* 18.6 20.0 93
Cole Creek 7850 16.0 15.2 105 17.8 19.7 90
Evening Star 9200 23.5 23.0 102 35.5 33.6 106
Fisher Creek 9100 34.9 32.2 108 41.0 38.6 106
Northeast Entrance 7350 .1 .0 * 16.7 15.7 106
Parker Peak 9400 23.4 19.4 121 28.5 22.6 126
Sylvan Lake 8420 11.0 14.2 77 28.9 27.9 104
Thumb Divide 7980 .6 .3 200* 19.9 22.9 87
Two Ocean Plateau 9240 31.1 28.0 111 31.4 33.1 95
White Mill 8700 25.5 21.6 118 26.8 29.2 92
Wolverine 7650 .0 .0 * 15.7 15.7 100
Younts Peak 8350 .0 11.1 0 18.4 19.8 93
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Basin Index (%) 104 100
WIND RIVER
Burroughs Creek 8750 .0 -M * 15.8 -M *
Castle Creek 8400 .0 -M * 8.7 -M *
Cold Springs 9630 .0 .0 * 9.8 14.5 68
Deer Park 9700 .5 9.5 5 16.9 26.1 65
Hobbs Park 10100 2.5 12.2 20 15.4 19.5 79
Kirwin 9550 .0 7.5 0 12.8 16.1 80
Little Warm 9370 .0 1.5 0 12.0 17.5 69
Owl Creek 8975 .1 .0 * 9.0 9.8 92
South Pass 9040 .1 4.9 2 14.3 22.6 63
St. Lawrence Alt 8620 .1 .0 * 9.7 13.6 71
Togwotee Pass 9580 24.5 22.8 107 32.0 29.9 107
Townsend Creek 8700 .0 .0 * 13.4 17.2 78
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Basin Index (%) 48 78
BIGHORN BASIN
Bald Mtn. 9380 19.1 18.4 104 19.1 22.2 86
Bear Trap Meadow 8200 .0 .0 * 12.1 12.8 95
Bone Springs Div 9350 14.9 13.7 109 18.0 21.1 85
Grave Springs 8550 .0 .9 0* 11.5 15.1 76
Kirwin 9550 .0 7.5 0 12.8 16.1 80
Marquette 8760 .1 -M * 11.5 -M *
Middle Powder 7760 .0 3.5 0 13.6 16.4 83
Owl Creek 8975 .1 .0 * 9.0 9.8 92
Powder River Pass 9480 5.0 4.0 125 16.9 17.5 97
Shell Creek 9580 12.9 14.6 88 16.5 18.7 88
Timber Creek 7950 .2 .0 * 8.9 12.4 72
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Basin Index (%) 83 85
SHOSHONE RIVER
Blackwater 9780 23.0 23.8 97 28.1 26.2 107
Evening Star 9200 23.5 23.0 102 35.5 33.6 106
Marquette 8760 .1 -M * 11.5 -M *
Sylvan Lake 8420 11.0 14.2 77 28.9 27.9 104
Sylvan Road 7120 .1 .0 * 19.9 20.5 97
Younts Peak 8350 .0 11.1 0 18.4 19.8 93
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Basin Index (%) 80 102
POWDER RIVER
Bear Trap Meadow 8200 .0 .0 * 12.1 12.8 95
Cloud Peak Reservoir 9860 9.2 13.8 67 17.2 19.8 87
Grave Springs 8550 .0 .9 0* 11.5 15.1 76
Hansen Sawmill 8360 .0 .0 * 12.4 13.1 95
Middle Powder 7760 .0 3.5 0 13.6 16.4 83
Powder River Pass 9480 5.0 4.0 125 16.9 17.5 97
Soldier Park 8720 .0 -M * 12.1 -M *
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Basin Index (%) 64* 88
TONGUE RIVER
Big Goose 7990 .1 2.9 3 12.4 17.3 72
Bone Springs Div 9350 14.9 13.7 109 18.0 21.1 85
Burgess Junction 7880 4.8 6.9 70 14.0 17.2 81
Dome Lake 8880 4.9 4.7 104 13.7 19.2 71
Little Goose 8870 2.3 -M * -M -M *
Sucker Creek 8880 4.3 7.6 57 16.4 20.5 80
Tie Creek 6870 .0 .0 * 15.5 17.4 89
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Basin Index (%) 81 80
BELLE FOURCHE
Blind Park 6890 .0 .0 * 11.4 17.0 67
Cole Canyon 5910 -M .0 * 16.5 15.0 110
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Basin Index (%) * 87
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 11.4 17.0 67
North Rapid Creek 6130 -M .0 * -M 14.7 *
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Basin Index (%) * 67
UPPER N. PLATTE
Arapaho Ridge 10960 16.1 16.5 98 26.5 28.5 93
Blackhall Mtn 9820 19.7 -M * 35.1 -M *
Columbine 9160 .9 .6 150* 34.5 30.7 112
Divide Peak 8880 .0 3.9 0 25.9 26.6 97
Joe Wright 10120 -M 20.2 * -M 33.0 *
Laprele Creek 8375 .0 .0 * 15.1 17.0 89
Med Bow 10500 37.8 -M * 43.2 -M *
Never Summer 10280 15.1 19.2 79 19.7 -M *
North French Creek 10130 27.6 28.2 98 39.2 33.9 116
Old Battle 10000 29.8 31.8 94 36.4 42.3 86
Rawah 9020 .0 .3 0* 18.6 18.9 98
Sage Creek Basin 7850 -M .0 * 15.2 17.5 87
Sand Lake 10050 27.5 27.0 102 33.7 32.1 105
South Brush Creek 8440 .0 .0 * 17.8 20.3 88
Tower 10500 41.6 46.9 89 50.3 48.1 105
Webber Springs 9250 8.4 9.9 85 31.0 32.2 96
Whiskey Park 8950 13.6 20.0 68 36.7 34.0 108
Willow Creek Pass 9540 3.9 8.2 48 16.4 17.5 94
Zirkel 9340 .5 6.5 8 -M 33.4 *
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Basin Index (%) 84 99
SWEETWATER
Deer Park 9700 .5 9.5 5 16.9 26.1 65
Larsen Creek 9000 .0 3.0 0 11.6 -M *
South Pass 9040 .1 4.9 2 14.3 22.6 63
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Basin Index (%) 3 64
LOWER N. PLATTE
Casper Mtn. 7900 .0 2.9 0 14.7 20.6 71
Laprele Creek 8375 .0 .0 * 15.1 17.0 89
Reno Hill 8400 3.6 1.7 212 21.1 21.6 98
Windy Peak 7900 -M .0 * -M 15.1 *
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Basin Index (%) 78 86
LARAMIE RIVER
Brooklyn Lake 10240 15.7 14.6 108 32.8 27.4 120
Cinnabar Park 9574 11.1 10.5 106 31.1 29.6 105
Crow Creek 8330 .0 .0 * 15.8 15.2 104
Deadman Hill 10220 10.6 15.3 69 21.4 23.2 92
Rawah 9020 .0 .3 0* 18.6 18.9 98
Roach 9700 .3 10.0 3 20.8 24.8 84
Windy Peak 7900 -M .0 * -M 15.1 *
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Basin Index (%) 74 101
S. PLATTE
Black Mountain 8920 .6 -M * 17.9 -M *
Crow Creek 8330 .0 .0 * 15.8 15.2 104
Deadman Hill 10220 10.6 15.3 69 21.4 23.2 92
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Basin Index (%) 69* 97
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 17.2 18.7 92
Divide Peak 8880 .0 3.9 0 25.9 26.6 97
Elk River 8700 .0 .0 * 21.0 24.7 85
Little Snake River 8915 7.5 11.0 68 38.3 35.2 109
Old Battle 10000 29.8 31.8 94 36.4 42.3 86
Sage Creek Basin 7850 -M .0 * 15.2 17.5 87
Sandstone RS 8150 .0 .0 * 19.7 22.6 87
Whiskey Park 8950 13.6 20.0 68 36.7 34.0 108
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Basin Index (%) 76 95
UPPER GREEN RIVER
Big Sandy Opening 9080 .1 1.1 9* 11.2 17.0 66
Blind Bull Sum 8650 28.6 18.8 152 19.5 23.4 83
East Rim Divide 7930 .1 .0 * 12.7 14.3 89
Elkhart Park G.S. 9400 .0 4.7 0 12.6 17.0 74
Gros Ventre Summit 8750 4.3 4.2 102 15.9 16.3 98
Gunsight Pass 9820 9.0 9.3 97 16.9 17.8 95
Indian Creek 9425 10.3 17.0 61 19.1 27.2 70
Kendall R.S. 7740 .0 .0 * 14.3 16.9 85
Loomis Park 8240 .0 1.0 0* 24.6 20.7 119
New Fork Lake 8340 .0 .0 * 11.7 13.7 85
Pocket Creek 9360 -M -M * 9.7 -M *
Snider Basin 8060 .0 .0 * 16.0 16.9 95
Spring Creek Divide 9000 19.9 19.0 105 28.7 28.3 101
Triple Peak 8500 9.9 6.4 155 31.3 30.4 103
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Basin Index (%) 101 90
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * 14.0 -M *
Buck Pasture 9632 -M -M * -M -M *
EF Blacks Fork GS 9360 .0 -M * 16.4 -M *
Hams Fork 7840 .0 .0 * 13.4 14.6 92
Hewinta 9500 .0 .0 * 17.1 17.9 96
Hickerson Park 9122 .0 .0 * 13.4 13.6 99
Hole-in-Rock 9168 .0 .0 * 13.4 13.2 102
Indian Creek 9425 10.3 17.0 61 19.1 27.2 70
Kelley R.S. 8180 .0 1.2 0* 18.8 22.0 85
Spirit Lk 10235 1.8 -M * 20.2 -M *
Steel Creek Park 10158 8.7 13.7 64 21.0 21.2 99
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Basin Index (%) 60* 90
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 12.9 -M *
Bug Lake 7987 .1 2.5 4 20.5 23.7 86
Burts Miller Ranch 8000 .0 -M * 7.9 -M *
Chalk Creek #1 9171 .3 13.7 2 21.5 31.1 69
Hayden Fork 9130 .0 .0 * 23.2 26.0 89
Kelley R.S. 8180 .0 1.2 0* 18.8 22.0 85
Lily Lake 9133 .1 .0 * 14.8 21.5 69
Monte Cristo 8932 8.8 12.9 68 28.6 31.8 90
Salt River Summit 7640 .0 .0 * 18.5 20.1 92
Spring Creek Divide 9000 19.9 19.0 105 28.7 28.3 101
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Basin Index (%) 59* 85
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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.
