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 SUNDAY: FEBRUARY 28 , 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 14.9 13.4 111 16.7 17.1 98
Blind Bull Sum 8650 18.3 17.6 104 12.4 15.9 78
Cottonwood Creek 7670 19.4 16.6 117 21.4 19.5 110
East Rim Divide 7930 8.1 8.0 101 7.7 9.5 81
Grand Targhee 9260 31.5 29.7 106 24.7 24.7 100
Granite Creek 6770 14.1 13.6 104 15.6 16.4 95
Grassy Lake 7265 25.5 25.9 98 27.5 29.3 94
Gros Ventre Summit 8750 7.1 9.6 74 -M 10.0 *
Gunsight Pass 9820 10.0 10.5 95 9.3 10.8 86
Lewis Lake Divide 7850 23.8 25.1 95 25.8 28.6 90
Loomis Park 8240 11.2 11.6 97 12.5 14.0 89
Phillips Bench 8200 21.4 19.5 110 21.4 22.6 95
Salt River Summit 7640 10.5 10.5 100 11.4 13.4 85
Snake River Station 6920 13.8 14.1 98 17.8 18.5 96
Somsen Ranch 6800 10.8 10.8 100 12.1 13.5 90
Spring Creek Divide 9000 19.9 18.3 109 19.6 19.1 103
Thumb Divide 7980 11.6 12.1 96 11.7 14.5 81
Togwotee Pass 9580 19.8 17.5 113 21.6 19.3 112
Triple Peak 8500 20.1 16.6 121 20.7 20.1 103
Two Ocean Plateau 9240 22.0 21.4 103 12.2 21.5 57
Willow Creek 8080 23.1 22.1 105 23.5 26.7 88
Younts Peak 8350 12.8 11.6 110 13.5 12.6 107
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Basin Index (%) 104 93
MADISON HEADWATERS IN WYOMING
Black Bear 8170 25.7 29.2 88 25.6 30.6 84
Canyon 7870 10.9 10.4 105 11.7 13.0 90
Madison Plateau 7750 16.2 17.7 92 16.8 21.1 80
West Yellowstone 6700 8.7 8.9 98 10.7 11.6 92
Whiskey Creek 6800 11.3 12.0 94 14.4 16.2 89
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Basin Index (%) 93 86
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 18.2 16.4 111 17.8 15.6 114
Canyon 7870 10.9 10.4 105 11.7 13.0 90
Evening Star 9200 24.1 18.9 128 25.8 22.0 117
Fisher Creek 9100 27.0 25.5 106 28.5 25.4 112
Monument Peak 8850 18.2 15.1 121 20.7 16.9 122
Northeast Entrance 7350 7.7 8.0 96 13.2 9.8 135
Parker Peak 9400 19.5 15.9 123 18.5 14.0 132
Sylvan Lake 8420 15.8 15.7 101 19.7 17.9 110
Thumb Divide 7980 11.6 12.1 96 11.7 14.5 81
Two Ocean Plateau 9240 22.0 21.4 103 12.2 21.5 57
White Mill 8700 22.6 18.1 125 21.5 18.8 114
Wolverine 7650 9.3 8.5 109 14.4 9.9 145
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Basin Index (%) 111 108
WIND RIVER
Burroughs Creek 8750 9.0 -M * 12.3 -M *
Castle Creek 8400 4.6 -M * 6.3 -M *
Cold Springs 9630 4.0 5.4 74 5.8 7.4 78
Deer Park 9700 7.7 10.8 71 10.0 15.1 66
Grave Springs 8550 4.6 6.7 69 5.1 7.8 65
Hobbs Park 10100 -M 9.5 * -M 9.4 *
Kirwin 9550 7.1 6.9 103 8.1 8.7 93
Little Warm 9370 7.9 7.8 101 10.1 9.8 103
South Pass 9040 7.9 11.3 70 8.5 13.3 64
St. Lawrence Alt 8620 .5 5.0 10 2.7 6.4 42
Togwotee Pass 9580 19.8 17.5 113 21.6 19.3 112
Townsend Creek 8700 3.6 6.3 57 5.2 8.5 61
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Basin Index (%) 81 80
BIGHORN BASIN
Bald Mtn. 9380 13.7 14.5 94 11.5 13.0 88
Bear Trap Meadow 8200 5.3 4.3 123 6.8 6.1 111
Bone Springs Div 9350 12.0 11.7 103 9.0 11.7 77
Grave Springs 8550 4.6 6.7 69 5.1 7.8 65
Kirwin 9550 7.1 6.9 103 8.1 8.7 93
Marquette 8760 3.2 -M * 4.8 -M *
Middle Powder 7760 7.3 7.9 92 6.7 8.7 77
Owl Creek 8975 3.6 3.9 92 3.6 4.3 84
Powder River Pass 9480 9.0 7.9 114 7.6 9.5 80
Shell Creek 9580 11.6 11.4 102 9.4 10.5 90
Timber Creek 7950 2.1 3.4 62 3.1 5.2 60
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Basin Index (%) 97 83
SHOSHONE RIVER
Blackwater 9780 17.6 17.0 104 18.8 16.0 118
Evening Star 9200 24.1 18.9 128 25.8 22.0 117
Marquette 8760 3.2 -M * 4.8 -M *
Sylvan Lake 8420 15.8 15.7 101 19.7 17.9 110
Sylvan Road 7120 10.4 9.3 112 -M 13.8 *
Younts Peak 8350 12.8 11.6 110 13.5 12.6 107
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Basin Index (%) 111 114
POWDER RIVER
Bear Trap Meadow 8200 5.3 4.3 123 6.8 6.1 111
Cloud Peak Reservoir 9860 10.4 10.3 101 10.5 9.5 111
Grave Springs 8550 4.6 6.7 69 5.1 7.8 65
Hansen Sawmill 8360 5.2 4.6 113 5.8 6.0 97
Middle Powder 7760 7.3 7.9 92 6.7 8.7 77
Powder River Pass 9480 9.0 7.9 114 7.6 9.5 80
Soldier Park 8720 3.4 -M * 6.7 -M *
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Basin Index (%) 100 89
TONGUE RIVER
Big Goose 7990 6.0 6.1 98 8.8 7.7 114
Bone Springs Div 9350 12.0 11.7 103 9.0 11.7 77
Burgess Junction 7880 7.9 8.2 96 10.1 8.9 113
Dome Lake 8880 9.3 8.5 109 9.7 9.9 98
Little Goose 8870 8.0 -M * 10.0 -M *
Sucker Creek 8880 10.1 8.8 115 13.0 10.5 124
Tie Creek 6870 3.4 4.2 81 7.6 8.2 93
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Basin Index (%) 103 102
BELLE FOURCHE
Blind Park 6890 4.6 6.4 72 7.1 9.3 76
Cole Canyon 5910 3.4 5.0 68 5.8 7.0 83
North Rapid Creek 6130 4.9 5.8 84 6.5 7.5 87
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Basin Index (%) 75 82
CHEYENNE RIVER BASIN
Blind Park 6890 4.6 6.4 72 7.1 9.3 76
North Rapid Creek 6130 4.9 5.8 84 6.5 7.5 87
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Basin Index (%) 78 81
UPPER N. PLATTE
Arapaho Ridge 10960 16.9 16.4 103 16.5 17.5 94
Blackhall Mtn 9820 23.1 -M * 20.9 -M *
Cinnabar Park 9574 14.5 16.9 86 16.3 19.6 83
Columbine 9160 18.8 19.6 96 16.9 20.2 84
Divide Peak 8880 12.3 15.5 79 14.1 16.7 84
Joe Wright 10120 14.5 16.4 88 17.6 19.8 89
Laprele Creek 8375 6.3 7.7 82 7.5 9.2 82
Med Bow 10500 32.5 -M * 27.5 -M *
Never Summer 10280 14.4 16.0 90 10.1 -M *
North French Creek 10130 23.4 20.9 112 23.2 20.9 111
Old Battle 10000 23.8 23.8 100 24.6 27.7 89
Rawah 9020 8.1 8.6 94 9.9 10.8 92
Sage Creek Basin 7850 8.7 10.5 83 8.5 11.6 73
Sand Lake 10050 22.6 21.0 108 20.4 18.7 109
South Brush Creek 8440 8.5 10.1 84 8.5 11.7 73
Tower 10500 29.6 35.8 83 27.5 31.6 87
Webber Springs 9250 16.8 18.5 91 17.3 21.0 82
Whiskey Park 8950 24.0 21.2 113 22.3 22.2 100
Willow Creek Pass 9540 9.2 9.4 98 8.0 10.2 78
Zirkel 9340 18.6 22.8 82 22.0 23.3 94
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Basin Index (%) 94 90
SWEETWATER
Deer Park 9700 7.7 10.8 71 10.0 15.1 66
Larsen Creek 9000 6.0 9.4 64 6.9 -M *
South Pass 9040 7.9 11.3 70 8.5 13.3 64
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Basin Index (%) 69 65
LOWER N. PLATTE
Casper Mtn. 7900 6.4 10.0 64 6.5 11.0 59
Laprele Creek 8375 6.3 7.7 82 7.5 9.2 82
Reno Hill 8400 7.9 9.8 81 9.1 11.0 83
Windy Peak 7900 4.5 5.7 79 6.2 7.7 81
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Basin Index (%) 76 75
LARAMIE RIVER
Brooklyn Lake 10240 19.1 14.8 129 20.7 15.9 130
Cinnabar Park 9574 14.5 16.9 86 16.3 19.6 83
Crow Creek 8330 2.0 6.7 30 5.9 7.7 77
Deadman Hill 10220 12.9 12.4 104 12.1 12.6 96
Rawah 9020 8.1 8.6 94 9.9 10.8 92
Roach 9700 10.9 12.3 89 11.9 14.6 82
Windy Peak 7900 4.5 5.7 79 6.2 7.7 81
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Basin Index (%) 93 93
S. PLATTE
Crow Creek 8330 2.0 6.7 30 5.9 7.7 77
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Basin Index (%) 30 77
LITTLE SNAKE RIVER
Battle Mountain 7440 7.7 9.8 79 10.6 12.1 88
Divide Peak 8880 12.3 15.5 79 14.1 16.7 84
Elk River 8700 13.4 15.2 88 10.1 15.8 64
Elkhead Divide 8780 12.6 -M * 13.6 -M *
Little Snake River 8915 20.0 19.6 102 24.9 24.9 100
Old Battle 10000 23.8 23.8 100 24.6 27.7 89
Sage Creek Basin 7850 8.7 10.5 83 8.5 11.6 73
Sandstone RS 8150 11.0 10.3 107 12.0 15.0 80
Whiskey Park 8950 24.0 21.2 113 22.3 22.2 100
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Basin Index (%) 96 87
UPPER GREEN RIVER
Big Sandy Opening 9080 7.9 9.9 80 7.4 10.4 71
Blind Bull Sum 8650 18.3 17.6 104 12.4 15.9 78
East Rim Divide 7930 8.1 8.0 101 7.7 9.5 81
Elkhart Park G.S. 9400 8.0 9.3 86 6.7 10.4 64
Gros Ventre Summit 8750 7.1 9.6 74 -M 10.0 *
Gunsight Pass 9820 10.0 10.5 95 9.3 10.8 86
Indian Creek 9425 16.7 18.7 89 14.7 17.7 83
Kendall R.S. 7740 10.5 9.7 108 11.4 11.6 98
Larsen Creek 9000 6.0 9.4 64 6.9 -M *
Loomis Park 8240 11.2 11.6 97 12.5 14.0 89
New Fork Lake 8340 7.9 8.1 98 8.3 8.7 95
Pocket Creek 9360 -M -M * 6.1 -M *
Snider Basin 8060 10.2 9.5 107 11.8 11.5 103
Spring Creek Divide 9000 19.9 18.3 109 19.6 19.1 103
Triple Peak 8500 20.1 16.6 121 20.7 20.1 103
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Basin Index (%) 97 89
LOWER GREEN RIVER
Blacks Fork Jct 8869 5.0 -M * 7.6 -M *
Buck Pasture 9632 10.2 -M * 11.1 -M *
EF Blacks Fork GS 9360 9.5 -M * 8.2 -M *
Hams Fork 7840 9.9 9.1 109 8.9 9.1 98
Henrys Fork 10182 -M -M * 8.6 -M *
Hewinta 9500 7.5 7.8 96 9.8 10.7 92
Hickerson Park 9122 4.6 5.8 79 5.7 7.5 76
Hole-in-Rock 9168 4.1 5.5 75 6.0 7.0 86
Indian Creek 9425 16.7 18.7 89 14.7 17.7 83
Kelley R.S. 8180 11.5 12.0 96 12.4 14.5 86
Spirit Lk 10235 7.6 -M * 8.6 -M *
Steel Creek Park 10158 10.9 11.4 96 12.2 12.3 99
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Basin Index (%) 93 88
UPPER BEAR RIVER
Bear River RS 8777 6.4 -M * 8.2 -M *
Bug Lake 7987 13.4 14.6 92 12.4 15.4 81
Burts Miller Ranch 8000 4.0 -M * 6.0 -M *
Chalk Creek #1 9171 12.0 18.1 66 13.3 19.3 69
Dry Bread Pond 8302 12.4 15.3 81 12.4 15.5 80
Giveout 6930 7.2 8.5 85 9.3 10.3 90
Hayden Fork 9130 10.2 11.9 86 13.8 16.3 85
Kelley R.S. 8180 11.5 12.0 96 12.4 14.5 86
Lily Lake 9133 8.4 10.1 83 9.2 13.1 70
Monte Cristo 8932 16.7 20.6 81 16.0 20.4 78
Salt River Summit 7640 10.5 10.5 100 11.4 13.4 85
Spring Creek Divide 9000 19.9 18.3 109 19.6 19.1 103
Trial Lake 9992 13.6 17.8 76 13.4 18.7 72
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Basin Index (%) 86 81
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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.
