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: FEBRUARY 20 , 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 13.7 13.0 105 15.4 16.3 94
Blind Bull Sum 8650 16.7 16.9 99 11.3 15.1 75
Cottonwood Creek 7670 18.1 15.5 117 20.0 18.4 109
East Rim Divide 7930 7.5 7.5 100 7.4 8.9 83
Grand Targhee 9260 30.3 27.6 110 22.9 23.7 97
Granite Creek 6770 13.1 13.0 101 14.8 15.6 95
Grassy Lake 7265 23.3 24.7 94 25.3 27.9 91
Gros Ventre Summit 8750 6.7 9.2 73 -M 9.5 *
Gunsight Pass 9820 9.1 9.9 92 8.6 10.2 84
Lewis Lake Divide 7850 21.3 24.2 88 23.5 27.3 86
Loomis Park 8240 10.4 10.9 95 11.7 13.2 89
Phillips Bench 8200 19.3 18.6 104 20.2 21.3 95
Salt River Summit 7640 9.7 9.8 99 10.8 12.6 86
Snake River Station 6920 12.6 13.6 93 16.2 17.7 92
Somsen Ranch 6800 10.0 10.2 98 11.3 12.9 88
Spring Creek Divide 9000 18.3 17.0 108 18.2 18.2 100
Thumb Divide 7980 10.7 11.1 96 11.1 13.8 80
Togwotee Pass 9580 18.4 16.8 110 19.9 18.3 109
Triple Peak 8500 18.7 15.8 118 19.4 18.8 103
Two Ocean Plateau 9240 19.9 20.2 99 11.5 20.4 56
Willow Creek 8080 21.1 20.5 103 21.8 25.1 87
Younts Peak 8350 11.7 11.1 105 12.7 12.0 106
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Basin Index (%) 101 91
MADISON HEADWATERS IN WYOMING
Black Bear 8170 23.2 27.8 83 23.4 29.0 81
Canyon 7870 10.1 9.8 103 10.9 12.4 88
Madison Plateau 7750 14.8 16.5 90 15.6 19.8 79
West Yellowstone 6700 8.2 8.1 101 10.1 11.0 92
Whiskey Creek 6800 10.4 11.3 92 13.5 15.3 88
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Basin Index (%) 91 84
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 17.2 15.7 110 16.7 14.9 112
Canyon 7870 10.1 9.8 103 10.9 12.4 88
Evening Star 9200 22.3 18.3 122 24.0 20.9 115
Fisher Creek 9100 25.1 24.4 103 27.0 24.0 112
Monument Peak 8850 17.1 14.2 120 19.7 16.2 122
Northeast Entrance 7350 7.0 7.5 93 12.7 9.4 135
Parker Peak 9400 18.2 14.7 124 18.1 13.2 137
Sylvan Lake 8420 14.3 14.9 96 18.3 17.0 108
Thumb Divide 7980 10.7 11.1 96 11.1 13.8 80
Two Ocean Plateau 9240 19.9 20.2 99 11.5 20.4 56
White Mill 8700 21.0 17.0 124 20.4 18.0 113
Wolverine 7650 8.6 8.2 105 13.9 9.4 148
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Basin Index (%) 109 108
WIND RIVER
Burroughs Creek 8750 8.1 -M * 11.9 -M *
Castle Creek 8400 4.3 -M * 6.0 -M *
Cold Springs 9630 3.9 5.3 74 5.6 7.0 80
Deer Park 9700 7.0 10.1 69 9.3 14.3 65
Grave Springs 8550 4.0 5.9 68 4.7 7.4 64
Hobbs Park 10100 -M 9.0 * -M 8.9 *
Kirwin 9550 7.0 6.4 109 8.0 8.3 96
Little Warm 9370 7.4 7.6 97 9.5 9.3 102
South Pass 9040 7.0 10.6 66 7.6 12.7 60
St. Lawrence Alt 8620 1.1 4.8 23 2.8 6.1 46
Togwotee Pass 9580 18.4 16.8 110 19.9 18.3 109
Townsend Creek 8700 3.5 6.0 58 5.0 8.2 61
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Basin Index (%) 81 79
BIGHORN BASIN
Bald Mtn. 9380 13.5 13.7 99 11.8 12.2 97
Bear Trap Meadow 8200 4.8 3.9 123 6.4 5.8 110
Bone Springs Div 9350 11.7 11.2 104 9.0 11.0 82
Grave Springs 8550 4.0 5.9 68 4.7 7.4 64
Kirwin 9550 7.0 6.4 109 8.0 8.3 96
Marquette 8760 3.3 -M * 4.5 -M *
Middle Powder 7760 6.5 7.4 88 6.1 8.2 74
Owl Creek 8975 2.9 3.5 83 3.1 4.0 78
Powder River Pass 9480 8.6 7.4 116 7.4 9.0 82
Shell Creek 9580 11.1 10.5 106 9.1 9.9 92
Timber Creek 7950 1.9 3.1 61 2.8 4.9 57
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Basin Index (%) 99 85
SHOSHONE RIVER
Blackwater 9780 16.3 16.2 101 17.2 15.2 113
Evening Star 9200 22.3 18.3 122 24.0 20.9 115
Marquette 8760 3.3 -M * 4.5 -M *
Sylvan Lake 8420 14.3 14.9 96 18.3 17.0 108
Sylvan Road 7120 9.6 8.8 109 -M 13.3 *
Younts Peak 8350 11.7 11.1 105 12.7 12.0 106
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Basin Index (%) 107 111
POWDER RIVER
Bear Trap Meadow 8200 4.8 3.9 123 6.4 5.8 110
Cloud Peak Reservoir 9860 9.2 9.9 93 9.5 9.0 106
Grave Springs 8550 4.0 5.9 68 4.7 7.4 64
Hansen Sawmill 8360 4.8 4.4 109 5.5 5.7 96
Middle Powder 7760 6.5 7.4 88 6.1 8.2 74
Powder River Pass 9480 8.6 7.4 116 7.4 9.0 82
Soldier Park 8720 2.9 -M * 6.1 -M *
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Basin Index (%) 97 88
TONGUE RIVER
Big Goose 7990 5.6 5.9 95 8.4 7.5 112
Bone Springs Div 9350 11.7 11.2 104 9.0 11.0 82
Burgess Junction 7880 7.6 7.6 100 9.9 8.5 116
Dome Lake 8880 8.0 8.0 100 9.3 9.4 99
Little Goose 8870 7.3 -M * 9.3 -M *
Sucker Creek 8880 9.6 8.2 117 12.4 9.9 125
Tie Creek 6870 3.3 4.1 80 7.4 7.9 94
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Basin Index (%) 102 104
BELLE FOURCHE
Blind Park 6890 4.0 5.8 69 6.5 8.9 73
Cole Canyon 5910 2.8 4.7 60 5.3 6.8 78
North Rapid Creek 6130 4.6 5.6 82 6.2 7.2 86
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Basin Index (%) 71 79
CHEYENNE RIVER BASIN
Blind Park 6890 4.0 5.8 69 6.5 8.9 73
North Rapid Creek 6130 4.6 5.6 82 6.2 7.2 86
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Basin Index (%) 75 79
UPPER N. PLATTE
Arapaho Ridge 10960 16.1 15.3 105 15.5 16.6 93
Blackhall Mtn 9820 21.6 -M * 21.0 -M *
Cinnabar Park 9574 13.5 16.2 83 15.1 18.9 80
Columbine 9160 17.6 18.2 97 15.7 19.1 82
Divide Peak 8880 11.8 14.6 81 13.5 16.0 84
Joe Wright 10120 13.2 15.3 86 16.3 18.6 88
Laprele Creek 8375 5.6 7.0 80 6.8 8.8 77
Med Bow 10500 30.0 -M * 25.6 -M *
Never Summer 10280 12.9 14.7 88 9.3 -M *
North French Creek 10130 21.8 19.6 111 21.7 19.8 110
Old Battle 10000 22.3 22.8 98 23.2 26.4 88
Rawah 9020 7.6 7.7 99 9.2 10.1 91
Sage Creek Basin 7850 8.6 10.2 84 8.2 11.3 73
Sand Lake 10050 20.7 19.4 107 18.8 17.8 106
South Brush Creek 8440 8.0 9.1 88 8.1 10.9 74
Tower 10500 27.2 34.0 80 25.9 29.9 87
Webber Springs 9250 15.7 17.4 90 16.2 19.9 81
Whiskey Park 8950 22.4 19.8 113 20.9 21.1 99
Willow Creek Pass 9540 8.5 8.9 96 7.5 9.7 77
Zirkel 9340 17.3 21.7 80 20.5 22.2 92
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Basin Index (%) 93 89
SWEETWATER
Deer Park 9700 7.0 10.1 69 9.3 14.3 65
Larsen Creek 9000 5.1 8.8 58 6.6 -M *
South Pass 9040 7.0 10.6 66 7.6 12.7 60
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Basin Index (%) 65 63
LOWER N. PLATTE
Casper Mtn. 7900 5.8 9.4 62 5.9 10.4 57
Laprele Creek 8375 5.6 7.0 80 6.8 8.8 77
Reno Hill 8400 6.6 9.2 72 7.9 10.5 75
Windy Peak 7900 4.0 5.4 74 5.6 7.4 76
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Basin Index (%) 71 71
LARAMIE RIVER
Brooklyn Lake 10240 17.4 14.3 122 19.0 15.0 127
Cinnabar Park 9574 13.5 16.2 83 15.1 18.9 80
Crow Creek 8330 1.5 6.6 23 5.3 7.4 72
Deadman Hill 10220 11.9 11.8 101 11.2 11.9 94
Rawah 9020 7.6 7.7 99 9.2 10.1 91
Roach 9700 10.2 11.9 86 11.2 13.8 81
Windy Peak 7900 4.0 5.4 74 5.6 7.4 76
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Basin Index (%) 89 91
S. PLATTE
Crow Creek 8330 1.5 6.6 23 5.3 7.4 72
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Basin Index (%) 23 72
LITTLE SNAKE RIVER
Battle Mountain 7440 7.6 8.9 85 10.3 11.4 90
Divide Peak 8880 11.8 14.6 81 13.5 16.0 84
Elk River 8700 12.6 14.1 89 9.5 15.1 63
Elkhead Divide 8780 12.1 -M * 13.2 -M *
Little Snake River 8915 18.7 18.8 99 23.6 24.1 98
Old Battle 10000 22.3 22.8 98 23.2 26.4 88
Sage Creek Basin 7850 8.6 10.2 84 8.2 11.3 73
Sandstone RS 8150 10.3 10.2 101 11.5 14.2 81
Whiskey Park 8950 22.4 19.8 113 20.9 21.1 99
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Basin Index (%) 96 86
UPPER GREEN RIVER
Big Sandy Opening 9080 7.4 9.3 80 7.0 9.8 71
Blind Bull Sum 8650 16.7 16.9 99 11.3 15.1 75
East Rim Divide 7930 7.5 7.5 100 7.4 8.9 83
Elkhart Park G.S. 9400 7.7 8.8 88 6.4 9.8 65
Gros Ventre Summit 8750 6.7 9.2 73 -M 9.5 *
Gunsight Pass 9820 9.1 9.9 92 8.6 10.2 84
Indian Creek 9425 15.2 17.2 88 13.6 16.7 81
Kendall R.S. 7740 9.6 9.2 104 10.6 10.9 97
Larsen Creek 9000 5.1 8.8 58 6.6 -M *
Loomis Park 8240 10.4 10.9 95 11.7 13.2 89
New Fork Lake 8340 7.4 7.6 97 8.0 8.2 98
Pocket Creek 9360 -M -M * 5.8 -M *
Snider Basin 8060 9.8 9.1 108 11.4 10.8 106
Spring Creek Divide 9000 18.3 17.0 108 18.2 18.2 100
Triple Peak 8500 18.7 15.8 118 19.4 18.8 103
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Basin Index (%) 95 89
LOWER GREEN RIVER
Blacks Fork Jct 8869 -M -M * -M -M *
Buck Pasture 9632 9.9 -M * 10.3 -M *
EF Blacks Fork GS 9360 9.2 -M * 7.9 -M *
Hams Fork 7840 9.4 8.6 109 8.5 8.6 99
Henrys Fork 10182 -M -M * 7.7 -M *
Hewinta 9500 6.7 7.2 93 9.5 10.1 94
Hickerson Park 9122 4.5 5.3 85 5.4 7.1 76
Hole-in-Rock 9168 4.0 5.0 80 6.0 6.7 90
Indian Creek 9425 15.2 17.2 88 13.6 16.7 81
Kelley R.S. 8180 10.9 11.0 99 11.9 13.7 87
Spirit Lk 10235 7.6 -M * 8.5 -M *
Steel Creek Park 10158 10.2 10.6 96 11.5 11.6 99
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Basin Index (%) 94 89
UPPER BEAR RIVER
Bear River RS 8777 5.8 -M * 7.7 -M *
Bug Lake 7987 11.9 13.7 87 11.4 14.6 78
Burts Miller Ranch 8000 3.7 -M * 5.8 -M *
Chalk Creek #1 9171 11.2 16.8 67 12.6 18.4 68
Dry Bread Pond 8302 11.4 14.4 79 11.6 14.6 79
Giveout 6930 6.8 7.8 87 8.7 9.7 90
Hayden Fork 9130 9.3 11.3 82 13.0 15.4 84
Kelley R.S. 8180 10.9 11.0 99 11.9 13.7 87
Lily Lake 9133 7.7 9.4 82 8.6 12.5 69
Monte Cristo 8932 15.2 19.4 78 14.4 19.3 75
Salt River Summit 7640 9.7 9.8 99 10.8 12.6 86
Spring Creek Divide 9000 18.3 17.0 108 18.2 18.2 100
Trial Lake 9992 12.9 16.3 79 12.8 17.6 73
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Basin Index (%) 85 80
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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.