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 SATURDAY: MAY 2 , 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 12.3 8.9 138 21.2 22.9 93
Black Bear 8170 -M 37.4 * 35.2 41.8 84
Blind Bull Sum 8650 28.5 23.0 124 18.1 21.4 85
Cottonwood Creek 7670 22.1 15.0 147 33.0 27.6 120
East Rim Divide 7930 3.4 8.2 41 11.7 13.0 90
Grand Targhee 9260 40.9 45.1 91 34.6 34.8 99
Granite Creek 6770 13.9 8.1 172 -M 21.4 *
Grassy Lake 7265 28.3 28.7 99 36.7 39.4 93
Gros Ventre Summit 8750 13.3 11.5 116 15.2 14.7 103
Gunsight Pass 9820 14.5 12.3 118 15.9 16.1 99
Lewis Lake Divide 7850 24.7 29.9 83 34.3 38.7 89
Phillips Bench 8200 28.9 25.1 115 33.3 30.7 108
Salt River Summit 7640 8.0 7.8 103 17.6 18.4 96
Snake River Station 6920 11.2 6.8 165 23.7 24.8 96
Spring Creek Divide 9000 26.8 24.3 110 27.3 26.3 104
Thumb Divide 7980 12.8 11.9 108 18.7 21.0 89
Togwotee Pass 9580 28.7 24.8 116 30.4 27.4 111
Two Ocean Plateau 9240 32.0 29.8 107 29.0 30.2 96
Willow Creek 8080 -M 22.6 * 40.8 37.7 108
Younts Peak 8350 13.1 15.6 84 16.6 17.7 94
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Basin Index (%) 108 98
MADISON-GALLATIN
Black Bear 8170 -M 37.4 * 35.2 41.8 84
Canyon 7870 12.7 10.0 127 17.3 18.1 96
Madison Plateau 7750 19.4 21.2 92 22.0 29.0 76
West Yellowstone 6700 .2 1.2 17 10.3 16.0 64
Whiskey Creek 6800 12.9 14.2 91 19.6 22.4 88
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Basin Index (%) 97 82
YELLOWSTONE
Beartooth Lake 9360 25.4 22.7 112 24.3 22.0 110
Burnt Mtn 5880 1.4 .0 * 16.3 16.0 102
Canyon 7870 12.7 10.0 127 17.3 18.1 96
Cole Creek 7850 18.3 16.6 110 16.0 16.5 97
Evening Star 9200 26.3 24.8 106 33.6 30.5 110
Fisher Creek 9100 34.1 32.6 105 37.4 35.2 106
Northeast Entrance 7350 4.1 2.4 171 14.7 13.8 107
Parker Peak 9400 29.5 21.2 139 26.6 20.1 132
Sylvan Lake 8420 18.9 19.5 97 27.0 25.1 108
Thumb Divide 7980 12.8 11.9 108 18.7 21.0 89
Two Ocean Plateau 9240 32.0 29.8 107 29.0 30.2 96
White Mill 8700 30.3 23.8 127 24.8 26.4 94
Wolverine 7650 5.7 1.9 300 14.9 13.8 108
Younts Peak 8350 13.1 15.6 84 16.6 17.7 94
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Basin Index (%) 114 104
WIND RIVER
Burroughs Creek 8750 9.3 -M * 15.5 -M *
Castle Creek 8400 .0 -M * 8.3 -M *
Cold Springs 9630 2.5 1.2 208 9.3 12.5 74
Deer Park 9700 11.7 15.8 74 16.2 23.5 69
Hobbs Park 10100 13.7 16.0 86 14.6 16.8 87
Kirwin 9550 11.1 10.5 106 12.5 13.9 90
Little Warm 9370 11.0 8.6 128 11.9 15.4 77
Owl Creek 8975 .2 .8 25 8.7 8.0 109
South Pass 9040 10.2 14.7 69 13.5 20.5 66
St. Lawrence Alt 8620 .0 2.1 0 9.3 11.6 80
Togwotee Pass 9580 28.7 24.8 116 30.4 27.4 111
Townsend Creek 8700 8.4 7.3 115 12.5 15.0 83
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Basin Index (%) 96 84
BIGHORN BASIN
Bald Mtn. 9380 21.9 20.5 107 18.3 19.8 92
Bear Trap Meadow 8200 1.9 .7 271 10.6 10.7 99
Bone Springs Div 9350 19.0 16.5 115 16.6 18.3 91
Grave Springs 8550 7.4 9.5 78 11.0 13.0 85
Kirwin 9550 11.1 10.5 106 12.5 13.9 90
Marquette 8760 6.6 -M * 11.0 -M *
Middle Powder 7760 10.1 11.5 88 12.9 14.2 91
Owl Creek 8975 .2 .8 25 8.7 8.0 109
Powder River Pass 9480 10.7 9.2 116 14.9 15.1 99
Shell Creek 9580 16.5 15.9 104 15.6 16.4 95
Timber Creek 7950 .4 3.0 13 8.4 10.1 83
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Basin Index (%) 101 93
SHOSHONE RIVER
Blackwater 9780 25.7 25.5 101 26.7 23.6 113
Evening Star 9200 26.3 24.8 106 33.6 30.5 110
Marquette 8760 6.6 -M * 11.0 -M *
Sylvan Lake 8420 18.9 19.5 97 27.0 25.1 108
Sylvan Road 7120 1.0 5.2 19 18.7 18.6 101
Younts Peak 8350 13.1 15.6 84 16.6 17.7 94
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Basin Index (%) 94 106
POWDER RIVER
Bear Trap Meadow 8200 1.9 .7 271 10.6 10.7 99
Cloud Peak Reservoir 9860 14.3 16.4 87 15.7 16.7 94
Grave Springs 8550 7.4 9.5 78 11.0 13.0 85
Hansen Sawmill 8360 3.5 2.1 167 10.6 11.0 96
Middle Powder 7760 10.1 11.5 88 12.9 14.2 91
Powder River Pass 9480 10.7 9.2 116 14.9 15.1 99
Soldier Park 8720 2.9 -M * 10.6 -M *
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Basin Index (%) 97 94
TONGUE RIVER
Big Goose 7990 7.7 9.2 84 11.3 14.2 80
Bone Springs Div 9350 19.0 16.5 115 16.6 18.3 91
Burgess Junction 7880 11.5 12.0 96 13.6 14.9 91
Dome Lake 8880 12.6 11.4 111 11.9 16.6 72
Little Goose 8870 9.7 -M * -M -M *
Sucker Creek 8880 12.0 12.0 100 15.1 17.5 86
Tie Creek 6870 2.2 2.6 85 14.2 14.5 98
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Basin Index (%) 102 86
BELLE FOURCHE
Blind Park 6890 -M .3 * 9.7 14.5 67
Cole Canyon 5910 -M .4 * -M 12.1 *
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Basin Index (%) * 67
CHEYENNE RIVER BASIN
Blind Park 6890 -M .3 * 9.7 14.5 67
North Rapid Creek 6130 .0 .7 0 9.4 12.4 76
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Basin Index (%) 0 71
UPPER N. PLATTE
Arapaho Ridge 10960 23.1 22.3 104 25.5 26.3 97
Blackhall Mtn 9820 29.7 -M * 32.8 -M *
Columbine 9160 21.9 17.8 123 33.1 28.7 115
Divide Peak 8880 14.6 18.0 81 24.1 24.4 99
Joe Wright 10120 23.5 23.1 102 30.9 30.0 103
Laprele Creek 8375 6.8 5.8 117 14.4 15.1 95
Med Bow 10500 43.3 -M * 39.9 -M *
Never Summer 10280 22.4 21.8 103 18.4 -M *
North French Creek 10130 34.6 32.8 105 35.9 30.8 117
Old Battle 10000 33.6 34.7 97 33.3 39.3 85
Rawah 9020 7.4 5.6 132 16.8 17.3 97
Sage Creek Basin 7850 3.1 1.1 282* 13.9 16.2 86
Sand Lake 10050 32.9 31.4 105 30.8 29.2 105
South Brush Creek 8440 5.0 8.8 57 14.8 17.9 83
Tower 10500 46.4 50.2 92 47.5 44.9 106
Webber Springs 9250 19.2 21.5 89 28.7 30.1 95
Whiskey Park 8950 26.7 26.6 100 34.6 31.6 109
Willow Creek Pass 9540 14.7 14.3 103 15.7 15.8 99
Zirkel 9340 20.2 20.9 97 35.0 31.1 113
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Basin Index (%) 100 101
SWEETWATER
Deer Park 9700 11.7 15.8 74 16.2 23.5 69
Larsen Creek 9000 .1 8.9 1 11.0 -M *
South Pass 9040 10.2 14.7 69 13.5 20.5 66
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Basin Index (%) 56 68
LOWER N. PLATTE
Casper Mtn. 7900 12.5 13.0 96 13.6 18.1 75
Laprele Creek 8375 6.8 5.8 117 14.4 15.1 95
Reno Hill 8400 15.7 12.4 127 19.9 19.0 105
Windy Peak 7900 4.1 3.7 111 11.1 13.0 85
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Basin Index (%) 112 90
LARAMIE RIVER
Brooklyn Lake 10240 27.7 23.3 119 30.7 24.8 124
Cinnabar Park 9574 21.3 19.2 111 29.4 27.0 109
Crow Creek 8330 .0 .0 * 13.5 13.5 100
Deadman Hill 10220 19.2 19.1 101 19.7 20.8 95
Rawah 9020 7.4 5.6 132 16.8 17.3 97
Roach 9700 12.9 17.1 75 19.0 22.4 85
Windy Peak 7900 4.1 3.7 111 11.1 13.0 85
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Basin Index (%) 105 101
S. PLATTE
Black Mountain 8920 7.2 -M * 16.5 -M *
Crow Creek 8330 .0 .0 * 13.5 13.5 100
Deadman Hill 10220 19.2 19.1 101 19.7 20.8 95
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Basin Index (%) 101* 97
LITTLE SNAKE RIVER
Battle Mountain 7440 .1 .0 * 15.8 17.2 92
Divide Peak 8880 14.6 18.0 81 24.1 24.4 99
Elk River 8700 11.4 12.9 88 20.0 22.8 88
Little Snake River 8915 21.9 22.1 99 36.0 32.9 109
Old Battle 10000 33.6 34.7 97 33.3 39.3 85
Sage Creek Basin 7850 3.1 1.1 282* 13.9 16.2 86
Sandstone RS 8150 6.7 5.6 120 17.6 20.8 85
Whiskey Park 8950 26.7 26.6 100 34.6 31.6 109
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Basin Index (%) 98 95
UPPER GREEN RIVER
Big Sandy Opening 9080 7.9 10.2 77 10.4 15.2 68
Blind Bull Sum 8650 28.5 23.0 124 18.1 21.4 85
East Rim Divide 7930 3.4 8.2 41 11.7 13.0 90
Elkhart Park G.S. 9400 8.8 11.1 79 11.9 15.1 79
Gros Ventre Summit 8750 13.3 11.5 116 15.2 14.7 103
Gunsight Pass 9820 14.5 12.3 118 15.9 16.1 99
Indian Creek 9425 20.0 22.8 88 18.2 25.1 73
Kendall R.S. 7740 5.7 3.8 150 13.7 15.6 88
Loomis Park 8240 11.6 10.8 107 21.2 19.0 112
New Fork Lake 8340 5.5 6.3 87 -M 12.2 *
Pocket Creek 9360 -M -M * 9.7 -M *
Snider Basin 8060 3.8 9.1 42 15.3 15.7 97
Spring Creek Divide 9000 26.8 24.3 110 27.3 26.3 104
Triple Peak 8500 23.3 17.1 136 30.3 28.0 108
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Basin Index (%) 102 93
LOWER GREEN RIVER
Blacks Fork Jct 8869 1.9 -M * 13.5 -M *
Buck Pasture 9632 12.6 -M * 19.4 -M *
EF Blacks Fork GS 9360 8.0 -M * 13.8 -M *
Hams Fork 7840 1.4 2.5 56 12.9 13.2 98
Hewinta 9500 4.7 4.6 102 16.3 16.3 100
Hickerson Park 9122 3.0 3.9 77 12.4 12.1 102
Hole-in-Rock 9168 2.6 2.2 118 12.6 11.6 109
Indian Creek 9425 20.0 22.8 88 18.2 25.1 73
Kelley R.S. 8180 9.6 11.2 86 17.8 20.2 88
Spirit Lk 10235 13.6 -M * 19.5 -M *
Steel Creek Park 10158 15.9 17.2 92 20.1 19.2 105
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Basin Index (%) 89 94
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 12.6 -M *
Bug Lake 7987 12.7 14.7 86 19.9 21.8 91
Burts Miller Ranch 8000 .0 -M * 7.8 -M *
Chalk Creek #1 9171 15.6 24.0 65 21.1 28.6 74
Hayden Fork 9130 6.8 9.1 75 22.5 23.9 94
Kelley R.S. 8180 9.6 11.2 86 17.8 20.2 88
Lily Lake 9133 6.6 10.0 66 14.1 19.6 72
Monte Cristo 8932 23.1 26.2 88 28.0 29.3 96
Salt River Summit 7640 8.0 7.8 103 17.6 18.4 96
Spring Creek Divide 9000 26.8 24.3 110 27.3 26.3 104
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Basin Index (%) 86 89
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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.