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 MONDAY: MARCH 22 , 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 15.6 14.7 106 17.5 19.2 91
Blind Bull Sum 8650 18.9 20.7 91 12.6 17.8 71
Cottonwood Creek 7670 19.3 20.2 96 22.2 22.2 100
East Rim Divide 7930 8.3 9.6 86 7.9 10.6 75
Grand Targhee 9260 33.9 33.2 102 26.7 27.2 98
Granite Creek 6770 14.5 14.8 98 15.7 18.2 86
Grassy Lake 7265 27.7 29.6 94 29.6 32.9 90
Gros Ventre Summit 8750 9.4 11.8 80 9.6 11.5 83
Gunsight Pass 9820 10.9 12.2 89 10.3 12.2 84
Lewis Lake Divide 7850 24.8 28.0 89 27.7 32.4 85
Loomis Park 8240 11.3 13.6 83 13.0 15.7 83
Phillips Bench 8200 21.5 22.6 95 22.7 25.5 89
Salt River Summit 7640 11.0 12.1 91 11.9 15.1 79
Snake River Station 6920 14.3 15.4 93 18.5 20.6 90
Somsen Ranch 6800 10.2 11.8 86 12.5 15.1 83
Spring Creek Divide 9000 20.5 21.5 95 20.6 21.6 95
Thumb Divide 7980 12.8 14.3 90 13.1 16.6 79
Togwotee Pass 9580 20.9 20.8 100 23.0 21.9 105
Triple Peak 8500 20.4 19.8 103 21.2 23.0 92
Two Ocean Plateau 9240 23.8 24.2 98 13.7 24.7 55
Willow Creek 8080 24.4 25.3 96 24.7 30.2 82
Younts Peak 8350 -M 13.6 * -M 14.3 *
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Basin Index (%) 94 86
MADISON HEADWATERS IN WYOMING
Black Bear 8170 -M 32.9 * 28.7 34.8 82
Canyon 7870 11.9 11.8 101 12.8 14.7 87
Madison Plateau 7750 18.4 20.2 91 19.2 23.8 81
West Yellowstone 6700 10.1 10.0 101 12.5 12.8 98
Whiskey Creek 6800 13.3 14.3 93 16.6 18.3 91
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Basin Index (%) 95 86
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 19.8 19.7 101 19.3 17.9 108
Canyon 7870 11.9 11.8 101 12.8 14.7 87
Evening Star 9200 25.2 22.5 112 27.1 24.7 110
Fisher Creek 9100 28.8 28.3 102 30.6 28.8 106
Monument Peak 8850 19.9 16.8 118 22.4 19.3 116
Northeast Entrance 7350 8.5 9.2 92 14.2 11.0 129
Parker Peak 9400 21.4 17.8 120 21.5 15.8 136
Sylvan Lake 8420 17.0 18.3 93 21.2 20.1 105
Thumb Divide 7980 12.8 14.3 90 13.1 16.6 79
Two Ocean Plateau 9240 23.8 24.2 98 13.7 24.7 55
White Mill 8700 24.1 20.2 119 23.0 21.4 107
Wolverine 7650 9.4 8.9 106 15.0 11.1 135
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Basin Index (%) 105 103
WIND RIVER
Burroughs Creek 8750 10.6 -M * 13.1 -M *
Castle Creek 8400 5.4 -M * 7.1 -M *
Cold Springs 9630 6.4 6.5 98 8.3 8.6 97
Deer Park 9700 11.3 13.7 82 13.6 17.4 78
Hobbs Park 10100 10.3 12.1 85 10.6 11.3 94
Kirwin 9550 8.3 8.5 98 9.3 10.1 92
Little Warm 9370 9.3 9.4 99 11.5 11.3 102
South Pass 9040 11.0 14.2 77 11.6 15.5 75
St. Lawrence Alt 8620 2.6 6.3 41 5.0 7.6 66
Togwotee Pass 9580 20.9 20.8 100 23.0 21.9 105
Townsend Creek 8700 7.6 8.4 90 9.3 10.2 91
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Basin Index (%) 88 90
BIGHORN BASIN
Bald Mtn. 9380 15.1 16.6 91 13.7 15.0 91
Bear Trap Meadow 8200 8.6 5.2 165 10.0 7.2 139
Bone Springs Div 9350 13.9 14.2 98 10.7 13.6 79
Grave Springs 8550 7.1 8.3 86 8.0 9.1 88
Kirwin 9550 8.3 8.5 98 9.3 10.1 92
Marquette 8760 4.0 -M * 5.8 -M *
Middle Powder 7760 11.1 10.1 110 9.4 10.2 92
Owl Creek 8975 5.1 4.6 111 5.0 5.1 98
Powder River Pass 9480 11.2 9.3 120 9.8 11.0 89
Shell Creek 9580 13.4 13.0 103 10.9 12.0 91
Timber Creek 7950 3.1 4.1 76 4.4 6.2 71
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Basin Index (%) 103 92
SHOSHONE RIVER
Blackwater 9780 19.1 21.0 91 20.4 18.3 111
Evening Star 9200 25.2 22.5 112 27.1 24.7 110
Marquette 8760 4.0 -M * 5.8 -M *
Sylvan Lake 8420 17.0 18.3 93 21.2 20.1 105
Sylvan Road 7120 10.1 10.5 96 -M 15.3 *
Younts Peak 8350 -M 13.6 * -M 14.3 *
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Basin Index (%) 99 109
POWDER RIVER
Bear Trap Meadow 8200 8.6 5.2 165 10.0 7.2 139
Cloud Peak Reservoir 9860 14.0 13.1 107 14.0 11.4 123
Grave Springs 8550 7.1 8.3 86 8.0 9.1 88
Hansen Sawmill 8360 8.5 5.8 147 9.2 7.3 126
Middle Powder 7760 11.1 10.1 110 9.4 10.2 92
Powder River Pass 9480 11.2 9.3 120 9.8 11.0 89
Soldier Park 8720 6.4 -M * 9.7 -M *
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Basin Index (%) 117 107
TONGUE RIVER
Big Goose 7990 8.2 8.0 102 11.0 9.4 117
Bone Springs Div 9350 13.9 14.2 98 10.7 13.6 79
Burgess Junction 7880 9.6 9.7 99 11.8 10.6 111
Dome Lake 8880 11.7 10.4 112 12.2 11.7 104
Little Goose 8870 10.9 -M * 12.5 -M *
Sucker Creek 8880 12.4 11.0 113 15.4 12.4 124
Tie Creek 6870 4.7 5.1 92 9.3 9.9 94
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Basin Index (%) 104 104
BELLE FOURCHE
Blind Park 6890 4.6 7.2 64 7.7 10.6 73
Cole Canyon 5910 3.8 5.6 68 6.2 8.0 78
North Rapid Creek 6130 5.5 6.6 83 7.1 8.7 82
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Basin Index (%) 72 77
CHEYENNE RIVER BASIN
Blind Park 6890 4.6 7.2 64 7.7 10.6 73
North Rapid Creek 6130 5.5 6.6 83 7.1 8.7 82
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Basin Index (%) 73 77
UPPER N. PLATTE
Arapaho Ridge 10960 19.5 18.1 108 19.4 19.8 98
Blackhall Mtn 9820 26.9 -M * 26.0 -M *
Cinnabar Park 9574 18.0 18.4 98 19.8 21.5 92
Columbine 9160 21.2 22.1 96 18.9 23.2 81
Divide Peak 8880 15.2 17.9 85 16.5 19.3 85
Joe Wright 10120 18.7 19.3 97 21.4 23.1 93
Laprele Creek 8375 10.2 9.3 110 11.4 10.9 105
Med Bow 10500 37.0 -M * 30.1 -M *
Never Summer 10280 16.7 18.0 93 12.5 -M *
North French Creek 10130 27.0 25.8 105 26.2 23.9 110
Old Battle 10000 26.7 26.8 100 28.2 31.8 89
Rawah 9020 10.9 9.7 112 12.7 12.4 102
Sage Creek Basin 7850 16.3 11.5 142 9.7 13.0 75
Sand Lake 10050 26.9 25.1 107 24.7 21.9 113
South Brush Creek 8440 9.5 11.2 85 9.5 13.5 70
Tower 10500 33.3 40.5 82 29.8 36.1 83
Webber Springs 9250 19.1 21.3 90 20.1 24.1 83
Whiskey Park 8950 27.1 24.5 111 24.9 25.2 99
Willow Creek Pass 9540 10.9 11.0 99 9.6 11.8 81
Zirkel 9340 21.8 25.6 85 -M 25.6 *
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Basin Index (%) 98 91
SWEETWATER
Deer Park 9700 11.3 13.7 82 13.6 17.4 78
Larsen Creek 9000 7.1 11.3 63 8.5 -M *
South Pass 9040 11.0 14.2 77 11.6 15.5 75
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Basin Index (%) 75 77
LOWER N. PLATTE
Casper Mtn. 7900 11.9 12.5 95 9.9 12.9 77
Laprele Creek 8375 10.2 9.3 110 11.4 10.9 105
Reno Hill 8400 13.2 12.2 108 14.2 13.2 108
Windy Peak 7900 11.3 7.3 155 12.1 9.2 132
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Basin Index (%) 113 103
LARAMIE RIVER
Brooklyn Lake 10240 23.3 17.9 130 24.3 18.7 130
Cinnabar Park 9574 18.0 18.4 98 19.8 21.5 92
Crow Creek 8330 5.4 6.9 78 9.6 9.1 105
Deadman Hill 10220 17.9 14.1 127 16.5 15.2 109
Rawah 9020 10.9 9.7 112 12.7 12.4 102
Roach 9700 14.8 14.2 104 16.1 17.1 94
Windy Peak 7900 11.3 7.3 155 12.1 9.2 132
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Basin Index (%) 115 108
S. PLATTE
Crow Creek 8330 5.4 6.9 78 9.6 9.1 105
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Basin Index (%) 78 105
LITTLE SNAKE RIVER
Battle Mountain 7440 8.2 11.3 73 11.8 13.7 86
Divide Peak 8880 15.2 17.9 85 16.5 19.3 85
Elk River 8700 15.5 17.4 89 12.0 18.1 66
Elkhead Divide 8780 14.7 -M * 15.6 -M *
Little Snake River 8915 21.4 21.3 100 27.0 26.7 101
Old Battle 10000 26.7 26.8 100 28.2 31.8 89
Sage Creek Basin 7850 16.3 11.5 142 9.7 13.0 75
Sandstone RS 8150 12.0 12.6 95 13.2 16.8 79
Whiskey Park 8950 27.1 24.5 111 24.9 25.2 99
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Basin Index (%) 99 87
UPPER GREEN RIVER
Big Sandy Opening 9080 9.3 11.8 79 8.4 11.9 71
Blind Bull Sum 8650 18.9 20.7 91 12.6 17.8 71
East Rim Divide 7930 8.3 9.6 86 7.9 10.6 75
Elkhart Park G.S. 9400 9.2 10.9 84 7.8 11.9 66
Gros Ventre Summit 8750 9.4 11.8 80 9.6 11.5 83
Gunsight Pass 9820 10.9 12.2 89 10.3 12.2 84
Indian Creek 9425 18.1 21.6 84 16.1 20.4 79
Kendall R.S. 7740 10.6 11.4 93 12.0 13.0 92
Larsen Creek 9000 7.1 11.3 63 8.5 -M *
Loomis Park 8240 11.3 13.6 83 13.0 15.7 83
New Fork Lake 8340 8.8 9.4 94 9.2 9.8 94
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 10.2 11.1 92 12.1 12.9 94
Spring Creek Divide 9000 20.5 21.5 95 20.6 21.6 95
Triple Peak 8500 20.4 19.8 103 21.2 23.0 92
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Basin Index (%) 88 84
LOWER GREEN RIVER
Blacks Fork Jct 8869 7.1 -M * 9.8 -M *
Buck Pasture 9632 12.6 -M * 13.5 -M *
EF Blacks Fork GS 9360 10.0 -M * 10.6 -M *
Hams Fork 7840 10.0 10.4 96 9.3 10.3 90
Henrys Fork 10182 -M -M * 11.8 -M *
Hewinta 9500 10.6 9.9 107 12.6 12.5 101
Hickerson Park 9122 9.4 6.7 140 10.2 9.0 113
Hole-in-Rock 9168 8.1 6.8 119 10.4 8.4 124
Indian Creek 9425 18.1 21.6 84 16.1 20.4 79
Kelley R.S. 8180 11.4 13.7 83 12.9 16.4 79
Spirit Lk 10235 12.4 -M * 13.3 -M *
Steel Creek Park 10158 14.5 13.6 107 15.6 14.5 108
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Basin Index (%) 99 95
UPPER BEAR RIVER
Bear River RS 8777 8.0 -M * 10.5 -M *
Bug Lake 7987 14.3 16.9 85 13.3 17.6 76
Burts Miller Ranch 8000 6.3 -M * 7.5 -M *
Chalk Creek #1 9171 15.6 21.6 72 16.3 22.4 73
Dry Bread Pond 8302 13.7 17.4 79 13.7 17.6 78
Giveout 6930 6.7 8.7 77 9.2 11.4 81
Hayden Fork 9130 12.5 14.4 87 17.0 18.8 90
Kelley R.S. 8180 11.4 13.7 83 12.9 16.4 79
Lily Lake 9133 10.7 11.5 93 11.4 15.2 75
Monte Cristo 8932 18.0 24.7 73 17.4 23.4 74
Salt River Summit 7640 11.0 12.1 91 11.9 15.1 79
Spring Creek Divide 9000 20.5 21.5 95 20.6 21.6 95
Trial Lake 9992 16.7 20.1 83 15.7 21.6 73
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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.
