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 WEDNESDAY: MAY 5 , 2021
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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 5.0 7.2 69 19.0 23.2 82
Blind Bull Sum 8650 20.2 22.7 89 14.3 21.7 66
Cottonwood Creek 7670 12.6 14.1 89 25.3 28.0 90
East Rim Divide 7930 .1 7.4 1 9.9 13.1 76
Grand Targhee 9260 35.7 46.0 78 31.1 35.3 88
Granite Creek 6770 4.6 7.4 62 -M 21.6 *
Grassy Lake 7265 18.9 27.6 68 32.8 39.8 82
Gros Ventre Summit 8750 7.2 10.8 67 11.8 14.9 79
Gunsight Pass 9820 10.6 11.8 90 13.0 16.3 80
Lewis Lake Divide 7850 17.9 29.5 61 30.8 39.1 79
Loomis Park 8240 6.0 9.5 63 15.5 19.2 81
Phillips Bench 8200 16.2 24.2 67 24.8 31.1 80
Salt River Summit 7640 4.6 7.1 65 14.7 18.6 79
Snake River Station 6920 .1 5.1 2 20.4 25.1 81
Somsen Ranch 6800 .0 .0 * 15.0 18.6 81
Spring Creek Divide 9000 22.0 24.2 91 24.1 26.6 91
Thumb Divide 7980 2.3 10.3 22 15.4 21.3 72
Togwotee Pass 9580 22.6 24.8 91 26.6 27.8 96
Triple Peak 8500 13.4 15.9 84 24.6 28.3 87
Two Ocean Plateau 9240 25.6 29.9 86 23.8 30.6 78
Willow Creek 8080 16.1 21.8 74 28.5 38.3 74
Younts Peak 8350 8.1 15.7 52 16.9 18.0 94
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Basin Index (%) 72 82
MADISON HEADWATERS IN WYOMING
Black Bear 8170 28.4 37.2 76 32.4 42.3 77
Canyon 7870 8.6 8.8 98 14.2 18.3 78
Madison Plateau 7750 14.5 20.8 70 21.7 29.4 74
West Yellowstone 6700 .0 .0 * 13.5 16.2 83
Whiskey Creek 6800 9.0 12.9 70 18.2 22.6 81
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Basin Index (%) 76 78
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 21.3 22.7 94 22.0 22.3 99
Canyon 7870 8.6 8.8 98 14.2 18.3 78
Evening Star 9200 25.0 24.9 100 31.6 30.9 102
Fisher Creek 9100 30.6 32.9 93 35.2 35.7 99
Monument Peak 8850 19.8 21.3 93 26.7 24.8 108
Northeast Entrance 7350 .0 1.2 0 15.6 14.0 111
Parker Peak 9400 21.3 21.3 100 25.3 20.4 124
Sylvan Lake 8420 9.3 18.7 50 23.9 25.5 94
Thumb Divide 7980 2.3 10.3 22 15.4 21.3 72
Two Ocean Plateau 9240 25.6 29.9 86 23.8 30.6 78
White Mill 8700 24.4 24.0 102 25.5 26.7 96
Wolverine 7650 .0 .8 0* 17.4 14.0 124
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Basin Index (%) 87 97
WIND RIVER
Burroughs Creek 8750 8.6 -M * 17.5 -M *
Castle Creek 8400 1.8 -M * 10.5 -M *
Cold Springs 9630 6.8 1.5 453 13.1 12.8 102
Deer Park 9700 13.0 15.1 86 18.9 23.8 79
Hobbs Park 10100 15.1 15.9 95 17.6 17.1 103
Kirwin 9550 11.8 10.7 110 14.3 14.2 101
Little Warm 9370 9.5 7.8 122 15.4 15.7 98
South Pass 9040 12.4 13.8 90 15.3 20.8 74
St. Lawrence Alt 8620 .9 1.8 50 9.6 11.8 81
Togwotee Pass 9580 22.6 24.8 91 26.6 27.8 96
Townsend Creek 8700 10.4 6.2 168 15.5 15.2 102
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Basin Index (%) 105 92
BIGHORN BASIN
Bald Mtn. 9380 20.2 20.4 99 18.6 20.1 93
Bear Trap Meadow 8200 6.0 .3 2000* 13.5 11.0 123
Bone Springs Div 9350 19.6 16.4 120 15.8 18.6 85
Grave Springs 8550 7.0 9.1 77 10.6 13.1 81
Kirwin 9550 11.8 10.7 110 14.3 14.2 101
Marquette 8760 8.4 -M * 11.7 -M *
Middle Powder 7760 11.8 11.3 104 12.8 14.5 88
Owl Creek 8975 4.7 .6 783 9.6 8.2 117
Powder River Pass 9480 12.1 9.1 133 14.0 15.4 91
Shell Creek 9580 17.8 16.2 110 15.4 16.7 92
Timber Creek 7950 4.8 2.3 209 10.9 10.3 106
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Basin Index (%) 120 95
SHOSHONE RIVER
Blackwater 9780 21.5 25.8 83 25.5 23.9 107
Evening Star 9200 25.0 24.9 100 31.6 30.9 102
Marquette 8760 8.4 -M * 11.7 -M *
Sylvan Lake 8420 9.3 18.7 50 23.9 25.5 94
Sylvan Road 7120 .0 3.7 0 15.1 18.9 80
Younts Peak 8350 8.1 15.7 52 16.9 18.0 94
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Basin Index (%) 72 96
POWDER RIVER
Bear Trap Meadow 8200 6.0 .3 2000* 13.5 11.0 123
Cloud Peak Reservoir 9860 19.3 16.4 118 20.9 17.1 122
Grave Springs 8550 7.0 9.1 77 10.6 13.1 81
Hansen Sawmill 8360 9.6 1.7 565 14.4 11.1 130
Middle Powder 7760 11.8 11.3 104 12.8 14.5 88
Powder River Pass 9480 12.1 9.1 133 14.0 15.4 91
Soldier Park 8720 8.2 -M * 14.5 -M *
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Basin Index (%) 137 105
TONGUE RIVER
Big Goose 7990 11.9 9.6 124 16.7 14.5 115
Bone Springs Div 9350 19.6 16.4 120 15.8 18.6 85
Burgess Junction 7880 14.2 11.7 121 17.6 15.1 117
Dome Lake 8880 14.8 11.3 131 18.1 16.8 108
Little Goose 8870 15.6 -M * 19.6 -M *
Sucker Creek 8880 16.4 12.0 137 22.0 17.8 124
Tie Creek 6870 4.2 2.4 175 14.7 14.8 99
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Basin Index (%) 128 107
BELLE FOURCHE
Blind Park 6890 .0 .0 * 11.3 14.7 77
Cole Canyon 5910 .0 .0 * 9.7 12.4 78
North Rapid Creek 6130 .7 .0 * 11.9 12.6 94
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Basin Index (%) * 83
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 11.3 14.7 77
North Rapid Creek 6130 .7 .0 * 11.9 12.6 94
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Basin Index (%) * 85
UPPER N. PLATTE
Arapaho Ridge 10960 20.8 22.2 94 24.4 26.8 91
Blackhall Mtn 9820 26.9 -M * 30.9 -M *
Cinnabar Park 9574 17.6 18.5 95 24.6 27.5 89
Columbine 9160 10.6 16.5 64 22.5 29.1 77
Divide Peak 8880 9.9 17.1 58 20.2 24.8 81
Joe Wright 10120 22.6 22.8 99 28.3 30.6 92
Laprele Creek 8375 7.0 5.2 135 14.8 15.4 96
Med Bow 10500 37.7 -M * 33.7 -M *
Never Summer 10280 19.2 21.9 88 16.2 -M *
North French Creek 10130 26.8 32.7 82 30.2 31.3 96
Old Battle 10000 30.4 35.0 87 32.2 39.8 81
Rawah 9020 4.4 4.4 100 16.1 17.7 91
Sage Creek Basin 7850 3.0 .6 500* 12.0 16.5 73
Sand Lake 10050 31.1 31.6 98 29.6 29.6 100
South Brush Creek 8440 .1 7.5 1 11.2 18.3 61
Tower 10500 35.6 51.0 70 37.4 45.5 82
Webber Springs 9250 17.4 20.8 84 24.5 30.4 81
Whiskey Park 8950 21.6 27.0 80 28.5 32.1 89
Willow Creek Pass 9540 12.1 14.5 83 12.4 16.1 77
Zirkel 9340 12.2 20.6 59 29.4 31.5 93
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Basin Index (%) 82 86
SWEETWATER
Deer Park 9700 13.0 15.1 86 18.9 23.8 79
Larsen Creek 9000 .0 8.0 0 11.0 -M *
South Pass 9040 12.4 13.8 90 15.3 20.8 74
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Basin Index (%) 69 77
LOWER N. PLATTE
Casper Mtn. 7900 11.8 12.2 97 14.2 18.5 77
Laprele Creek 8375 7.0 5.2 135 14.8 15.4 96
Reno Hill 8400 14.4 12.0 120 19.0 19.4 98
Windy Peak 7900 9.2 2.8 329 14.8 13.3 111
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Basin Index (%) 132 94
LARAMIE RIVER
Brooklyn Lake 10240 21.9 22.8 96 28.8 25.2 114
Cinnabar Park 9574 17.6 18.5 95 24.6 27.5 89
Crow Creek 8330 .9 .0 * 13.7 13.8 99
Deadman Hill 10220 21.7 19.1 114 21.8 21.1 103
Rawah 9020 4.4 4.4 100 16.1 17.7 91
Roach 9700 15.7 17.0 92 22.4 22.8 98
Windy Peak 7900 9.2 2.8 329 14.8 13.3 111
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Basin Index (%) 108 101
S. PLATTE
Crow Creek 8330 .9 .0 * 13.7 13.8 99
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Basin Index (%) * 99
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 12.2 17.4 70
Divide Peak 8880 9.9 17.1 58 20.2 24.8 81
Elk River 8700 6.3 11.3 56 14.2 23.2 61
Elkhead Divide 8780 8.6 -M * 18.6 -M *
Little Snake River 8915 15.0 21.4 70 30.3 33.3 91
Old Battle 10000 30.4 35.0 87 32.2 39.8 81
Sage Creek Basin 7850 3.0 .6 500* 12.0 16.5 73
Sandstone RS 8150 -M 4.1 * 14.6 21.1 69
Whiskey Park 8950 21.6 27.0 80 28.5 32.1 89
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Basin Index (%) 77 79
UPPER GREEN RIVER
Big Sandy Opening 9080 9.2 9.0 102 11.0 15.5 71
Blind Bull Sum 8650 20.2 22.7 89 14.3 21.7 66
East Rim Divide 7930 .1 7.4 1 9.9 13.1 76
Elkhart Park G.S. 9400 9.2 10.3 89 10.8 15.3 71
Gros Ventre Summit 8750 7.2 10.8 67 11.8 14.9 79
Gunsight Pass 9820 10.6 11.8 90 13.0 16.3 80
Indian Creek 9425 16.5 21.8 76 20.2 25.4 80
Kendall R.S. 7740 .0 2.0 0 14.2 15.7 90
Larsen Creek 9000 .0 8.0 0 11.0 -M *
Loomis Park 8240 6.0 9.5 63 15.5 19.2 81
New Fork Lake 8340 2.2 5.0 44 11.6 12.4 94
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 -M 8.2 * -M 15.8 *
Spring Creek Divide 9000 22.0 24.2 91 24.1 26.6 91
Triple Peak 8500 13.4 15.9 84 24.6 28.3 87
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Basin Index (%) 74 81
LOWER GREEN RIVER
Blacks Fork Jct 8869 .5 -M * 11.2 -M *
Buck Pasture 9632 7.6 -M * 16.4 -M *
EF Blacks Fork GS 9360 6.5 -M * 12.6 -M *
Hams Fork 7840 .0 1.1 0 12.1 13.3 91
Henrys Fork 10182 -M -M * 14.1 -M *
Hewinta 9500 2.7 4.0 68 14.6 16.6 88
Hickerson Park 9122 1.2 2.7 44 12.3 12.3 100
Hole-in-Rock 9168 2.8 1.5 187 12.8 11.9 108
Indian Creek 9425 16.5 21.8 76 20.2 25.4 80
Kelley R.S. 8180 6.9 10.0 69 15.9 20.5 78
Spirit Lk 10235 11.3 -M * 16.6 -M *
Steel Creek Park 10158 14.8 17.5 85 18.4 19.6 94
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Basin Index (%) 77 89
UPPER BEAR RIVER
Bear River RS 8777 .1 -M * 11.6 -M *
Bug Lake 7987 8.4 13.4 63 16.0 22.1 72
Burts Miller Ranch 8000 .0 -M * 7.7 -M *
Chalk Creek #1 9171 10.4 23.2 45 19.3 29.1 66
Dry Bread Pond 8302 3.0 12.0 25 16.0 22.3 72
Giveout 6930 .0 .0 * 10.8 14.2 76
Hayden Fork 9130 .2 8.1 2 19.2 24.3 79
Kelley R.S. 8180 6.9 10.0 69 15.9 20.5 78
Lily Lake 9133 4.0 9.2 43 12.9 20.0 64
Monte Cristo 8932 13.5 24.6 55 21.1 29.9 71
Salt River Summit 7640 4.6 7.1 65 14.7 18.6 79
Spring Creek Divide 9000 22.0 24.2 91 24.1 26.6 91
Trial Lake 9992 12.8 21.9 58 18.7 27.5 68
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Basin Index (%) 56 74
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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.