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: MARCH 25 , 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 15.8 14.6 108 17.6 19.4 91
Blind Bull Sum 8650 19.2 21.1 91 12.8 18.1 71
Cottonwood Creek 7670 19.5 20.5 95 22.6 22.7 100
East Rim Divide 7930 8.5 9.7 88 8.0 10.9 73
Grand Targhee 9260 34.5 33.9 102 27.0 27.7 97
Granite Creek 6770 14.9 14.8 101 15.7 18.5 85
Grassy Lake 7265 28.2 30.3 93 30.0 33.4 90
Gros Ventre Summit 8750 9.4 12.0 78 9.7 11.8 82
Gunsight Pass 9820 10.9 12.5 87 10.5 12.5 84
Lewis Lake Divide 7850 25.2 28.6 88 28.1 32.9 85
Loomis Park 8240 11.3 14.0 81 13.0 16.0 81
Phillips Bench 8200 21.9 23.1 95 22.9 25.9 88
Salt River Summit 7640 11.2 12.3 91 12.2 15.4 79
Snake River Station 6920 14.7 15.6 94 18.7 20.9 89
Somsen Ranch 6800 10.5 11.8 89 13.0 15.3 85
Spring Creek Divide 9000 21.0 21.9 96 21.1 22.0 96
Thumb Divide 7980 13.0 14.8 88 13.1 16.9 78
Togwotee Pass 9580 21.0 21.1 100 23.1 22.3 104
Triple Peak 8500 20.6 20.3 101 21.5 23.4 92
Two Ocean Plateau 9240 24.0 24.6 98 13.9 25.1 55
Willow Creek 8080 25.1 25.5 98 25.2 30.7 82
Younts Peak 8350 13.5 13.7 99 14.4 14.5 99
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Basin Index (%) 95 86
MADISON HEADWATERS IN WYOMING
Black Bear 8170 29.6 33.9 87 29.4 35.3 83
Canyon 7870 12.0 12.0 100 13.0 14.9 87
Madison Plateau 7750 18.9 20.6 92 19.6 24.2 81
West Yellowstone 6700 10.3 10.0 103 12.6 12.9 98
Whiskey Creek 6800 13.5 14.4 94 16.8 18.6 90
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Basin Index (%) 93 86
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.0 20.1 100 19.4 18.1 107
Canyon 7870 12.0 12.0 100 13.0 14.9 87
Evening Star 9200 25.6 23.1 111 27.4 25.0 110
Fisher Creek 9100 29.1 28.6 102 30.9 29.3 105
Monument Peak 8850 20.4 17.3 118 22.9 19.7 116
Northeast Entrance 7350 8.6 9.5 91 14.4 11.2 129
Parker Peak 9400 22.0 18.0 122 21.9 16.1 136
Sylvan Lake 8420 17.3 18.6 93 21.6 20.4 106
Thumb Divide 7980 13.0 14.8 88 13.1 16.9 78
Two Ocean Plateau 9240 24.0 24.6 98 13.9 25.1 55
White Mill 8700 24.4 20.8 117 23.2 21.8 106
Wolverine 7650 9.8 8.9 110 15.2 11.2 136
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Basin Index (%) 105 103
WIND RIVER
Burroughs Creek 8750 10.6 -M * 13.6 -M *
Castle Creek 8400 5.4 -M * 7.2 -M *
Cold Springs 9630 6.6 6.7 99 8.6 8.8 98
Deer Park 9700 12.2 14.1 87 14.6 17.6 83
Hobbs Park 10100 11.5 12.5 92 11.9 11.5 103
Kirwin 9550 8.8 8.7 101 9.9 10.3 96
Little Warm 9370 9.4 9.7 97 11.7 11.5 102
South Pass 9040 11.9 14.4 83 12.7 15.7 81
St. Lawrence Alt 8620 3.6 6.4 56 5.6 7.8 72
Togwotee Pass 9580 21.0 21.1 100 23.1 22.3 104
Townsend Creek 8700 9.0 8.6 105 10.8 10.4 104
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Basin Index (%) 92 94
BIGHORN BASIN
Bald Mtn. 9380 15.4 16.8 92 13.8 15.3 90
Bear Trap Meadow 8200 8.6 5.2 165 10.1 7.4 136
Bone Springs Div 9350 14.4 14.3 101 11.0 13.8 80
Grave Springs 8550 7.3 8.3 88 8.1 9.3 87
Kirwin 9550 8.8 8.7 101 9.9 10.3 96
Marquette 8760 4.6 -M * 6.4 -M *
Middle Powder 7760 11.2 10.4 108 9.6 10.4 92
Owl Creek 8975 5.5 4.7 117 5.5 5.2 106
Powder River Pass 9480 11.2 9.5 118 9.8 11.3 87
Shell Creek 9580 13.6 13.3 102 11.0 12.3 89
Timber Creek 7950 3.4 4.2 81 4.7 6.4 73
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Basin Index (%) 104 92
SHOSHONE RIVER
Blackwater 9780 19.2 21.1 91 20.5 18.6 110
Evening Star 9200 25.6 23.1 111 27.4 25.0 110
Marquette 8760 4.6 -M * 6.4 -M *
Sylvan Lake 8420 17.3 18.6 93 21.6 20.4 106
Sylvan Road 7120 9.9 10.7 93 11.1 15.5 72
Younts Peak 8350 13.5 13.7 99 14.4 14.5 99
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Basin Index (%) 98 101
POWDER RIVER
Bear Trap Meadow 8200 8.6 5.2 165 10.1 7.4 136
Cloud Peak Reservoir 9860 14.6 13.4 109 14.5 11.7 124
Grave Springs 8550 7.3 8.3 88 8.1 9.3 87
Hansen Sawmill 8360 8.8 6.0 147 9.4 7.5 125
Middle Powder 7760 11.2 10.4 108 9.6 10.4 92
Powder River Pass 9480 11.2 9.5 118 9.8 11.3 87
Soldier Park 8720 6.8 -M * 10.0 -M *
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Basin Index (%) 117 107
TONGUE RIVER
Big Goose 7990 8.6 8.1 106 11.2 9.6 117
Bone Springs Div 9350 14.4 14.3 101 11.0 13.8 80
Burgess Junction 7880 9.9 10.1 98 12.2 10.8 113
Dome Lake 8880 12.0 10.7 112 12.5 12.0 104
Little Goose 8870 11.3 -M * 13.0 -M *
Sucker Creek 8880 13.0 11.1 117 16.0 12.7 126
Tie Creek 6870 4.9 5.2 94 9.5 10.0 95
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Basin Index (%) 106 105
BELLE FOURCHE
Blind Park 6890 4.5 7.0 64 7.8 10.7 73
Cole Canyon 5910 4.2 5.7 74 6.4 8.2 78
North Rapid Creek 6130 5.6 6.7 84 7.3 8.8 83
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Basin Index (%) 74 78
CHEYENNE RIVER BASIN
Blind Park 6890 4.5 7.0 64 7.8 10.7 73
North Rapid Creek 6130 5.6 6.7 84 7.3 8.8 83
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Basin Index (%) 74 77
UPPER N. PLATTE
Arapaho Ridge 10960 19.7 18.5 106 19.5 20.3 96
Blackhall Mtn 9820 27.2 -M * 26.3 -M *
Cinnabar Park 9574 18.3 19.2 95 20.1 22.0 91
Columbine 9160 21.4 22.0 97 18.6 23.5 79
Divide Peak 8880 15.4 18.3 84 16.9 19.6 86
Joe Wright 10120 19.0 19.4 98 21.7 23.5 92
Laprele Creek 8375 10.7 9.4 114 12.1 11.2 108
Med Bow 10500 37.3 -M * 30.4 -M *
Never Summer 10280 17.0 18.5 92 12.4 -M *
North French Creek 10130 27.0 26.6 102 26.4 24.5 108
Old Battle 10000 27.1 27.6 98 28.4 32.2 88
Rawah 9020 11.2 9.8 114 12.9 12.7 102
Sage Creek Basin 7850 16.9 11.9 142 9.8 13.2 74
Sand Lake 10050 27.8 25.7 108 25.5 22.4 114
South Brush Creek 8440 9.7 11.6 84 9.7 13.8 70
Tower 10500 33.4 41.3 81 29.7 36.7 81
Webber Springs 9250 19.2 21.8 88 20.4 24.5 83
Whiskey Park 8950 27.5 24.6 112 25.0 25.7 97
Willow Creek Pass 9540 11.1 11.2 99 9.7 12.0 81
Zirkel 9340 22.4 25.6 88 -M 26.1 *
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Basin Index (%) 98 91
SWEETWATER
Deer Park 9700 12.2 14.1 87 14.6 17.6 83
Larsen Creek 9000 7.6 11.6 66 8.8 -M *
South Pass 9040 11.9 14.4 83 12.7 15.7 81
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Basin Index (%) 79 82
LOWER N. PLATTE
Casper Mtn. 7900 13.0 12.7 102 10.9 13.3 82
Laprele Creek 8375 10.7 9.4 114 12.1 11.2 108
Reno Hill 8400 14.5 12.4 117 15.2 13.6 112
Windy Peak 7900 11.7 7.5 156 12.5 9.4 133
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Basin Index (%) 119 107
LARAMIE RIVER
Brooklyn Lake 10240 23.6 18.3 129 24.8 19.1 130
Cinnabar Park 9574 18.3 19.2 95 20.1 22.0 91
Crow Creek 8330 5.4 6.9 78 9.7 9.6 101
Deadman Hill 10220 18.3 14.4 127 16.8 15.5 108
Rawah 9020 11.2 9.8 114 12.9 12.7 102
Roach 9700 15.4 14.4 107 16.5 17.4 95
Windy Peak 7900 11.7 7.5 156 12.5 9.4 133
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Basin Index (%) 115 107
S. PLATTE
Crow Creek 8330 5.4 6.9 78 9.7 9.6 101
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Basin Index (%) 78 101
LITTLE SNAKE RIVER
Battle Mountain 7440 7.6 11.2 68 11.8 13.9 85
Divide Peak 8880 15.4 18.3 84 16.9 19.6 86
Elk River 8700 15.9 17.6 90 12.0 18.4 65
Elkhead Divide 8780 14.9 -M * 15.7 -M *
Little Snake River 8915 21.9 21.6 101 27.4 27.1 101
Old Battle 10000 27.1 27.6 98 28.4 32.2 88
Sage Creek Basin 7850 16.9 11.9 142 9.8 13.2 74
Sandstone RS 8150 13.0 12.9 101 13.2 17.1 77
Whiskey Park 8950 27.5 24.6 112 25.0 25.7 97
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Basin Index (%) 100 86
UPPER GREEN RIVER
Big Sandy Opening 9080 9.4 11.9 79 8.5 12.1 70
Blind Bull Sum 8650 19.2 21.1 91 12.8 18.1 71
East Rim Divide 7930 8.5 9.7 88 8.0 10.9 73
Elkhart Park G.S. 9400 9.2 11.2 82 7.8 12.2 64
Gros Ventre Summit 8750 9.4 12.0 78 9.7 11.8 82
Gunsight Pass 9820 10.9 12.5 87 10.5 12.5 84
Indian Creek 9425 18.5 22.2 83 16.4 20.7 79
Kendall R.S. 7740 11.2 11.4 98 12.1 13.2 92
Larsen Creek 9000 7.6 11.6 66 8.8 -M *
Loomis Park 8240 11.3 14.0 81 13.0 16.0 81
New Fork Lake 8340 8.7 9.7 90 9.4 10.0 94
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 10.3 11.3 91 12.3 13.1 94
Spring Creek Divide 9000 21.0 21.9 96 21.1 22.0 96
Triple Peak 8500 20.6 20.3 101 21.5 23.4 92
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Basin Index (%) 88 83
LOWER GREEN RIVER
Blacks Fork Jct 8869 7.7 -M * 9.9 -M *
Buck Pasture 9632 12.9 -M * 13.8 -M *
EF Blacks Fork GS 9360 12.6 -M * 10.9 -M *
Hams Fork 7840 10.5 10.5 100 9.5 10.5 90
Henrys Fork 10182 -M -M * 12.0 -M *
Hewinta 9500 11.4 9.9 115 12.9 12.7 102
Hickerson Park 9122 10.1 6.9 146 10.7 9.2 116
Hole-in-Rock 9168 8.6 6.9 125 10.9 8.6 127
Indian Creek 9425 18.5 22.2 83 16.4 20.7 79
Kelley R.S. 8180 11.8 14.1 84 13.4 16.7 80
Spirit Lk 10235 13.2 -M * 14.1 -M *
Steel Creek Park 10158 14.8 13.8 107 16.0 14.7 109
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Basin Index (%) 102 96
UPPER BEAR RIVER
Bear River RS 8777 8.2 -M * 10.5 -M *
Bug Lake 7987 14.6 17.3 84 13.5 17.8 76
Burts Miller Ranch 8000 6.7 -M * 7.5 -M *
Chalk Creek #1 9171 15.8 22.1 71 16.4 22.9 72
Dry Bread Pond 8302 13.5 17.4 78 14.1 17.9 79
Giveout 6930 7.4 8.5 87 9.3 11.6 80
Hayden Fork 9130 12.6 14.5 87 17.2 19.1 90
Kelley R.S. 8180 11.8 14.1 84 13.4 16.7 80
Lily Lake 9133 10.8 11.6 93 11.5 15.5 74
Monte Cristo 8932 18.5 25.1 74 17.9 23.7 76
Salt River Summit 7640 11.2 12.3 91 12.2 15.4 79
Spring Creek Divide 9000 21.0 21.9 96 21.1 22.0 96
Trial Lake 9992 16.9 20.6 82 15.8 21.9 72
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Basin Index (%) 83 79
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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.
