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 FRIDAY: MARCH 19 , 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 15.5 14.7 105 17.2 18.9 91
Blind Bull Sum 8650 18.9 20.4 93 12.7 17.6 72
Cottonwood Creek 7670 19.5 19.7 99 21.8 21.8 100
East Rim Divide 7930 8.6 9.5 91 8.1 10.5 77
Grand Targhee 9260 32.2 32.9 98 25.6 26.9 95
Granite Creek 6770 14.7 15.0 98 -M 18.1 *
Grassy Lake 7265 26.3 29.3 90 28.1 32.5 86
Gros Ventre Summit 8750 9.2 11.6 79 9.6 11.4 84
Gunsight Pass 9820 10.8 12.0 90 10.2 12.0 85
Lewis Lake Divide 7850 24.2 27.6 88 27.0 31.9 85
Loomis Park 8240 11.6 13.3 87 12.9 15.5 83
Phillips Bench 8200 21.5 22.3 96 22.6 25.2 90
Salt River Summit 7640 10.9 12.0 91 12.0 14.9 81
Snake River Station 6920 14.2 15.1 94 17.9 20.3 88
Somsen Ranch 6800 10.2 11.8 86 12.3 14.9 83
Spring Creek Divide 9000 20.5 20.9 98 20.6 21.3 97
Thumb Divide 7980 11.9 14.0 85 12.1 16.4 74
Togwotee Pass 9580 20.6 20.5 100 22.6 21.7 104
Triple Peak 8500 20.3 19.3 105 21.2 22.6 94
Two Ocean Plateau 9240 22.9 23.9 96 13.4 24.2 55
Willow Creek 8080 24.6 25.4 97 24.2 29.8 81
Younts Peak 8350 13.2 13.4 99 14.2 14.0 101
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Basin Index (%) 94 86
MADISON HEADWATERS IN WYOMING
Black Bear 8170 -M 32.4 * 27.0 34.3 79
Canyon 7870 11.3 11.7 97 12.3 14.5 85
Madison Plateau 7750 16.9 20.0 84 17.7 23.5 75
West Yellowstone 6700 9.4 9.9 95 11.2 12.7 88
Whiskey Creek 6800 12.0 14.1 85 15.3 18.0 85
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Basin Index (%) 89 81
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 19.2 19.1 101 18.9 17.6 107
Canyon 7870 11.3 11.7 97 12.3 14.5 85
Evening Star 9200 24.8 22.0 113 27.0 24.3 111
Fisher Creek 9100 27.9 28.2 99 29.8 28.4 105
Monument Peak 8850 18.9 16.6 114 21.4 19.0 113
Northeast Entrance 7350 8.0 9.0 89 13.6 10.9 125
Parker Peak 9400 20.4 17.5 117 20.6 15.6 132
Sylvan Lake 8420 16.0 18.0 89 20.3 19.8 103
Thumb Divide 7980 11.9 14.0 85 12.1 16.4 74
Two Ocean Plateau 9240 22.9 23.9 96 13.4 24.2 55
White Mill 8700 23.2 19.7 118 22.3 21.1 106
Wolverine 7650 8.9 8.9 100 14.7 10.9 135
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Basin Index (%) 102 102
WIND RIVER
Burroughs Creek 8750 10.6 -M * 13.6 -M *
Castle Creek 8400 5.4 -M * 7.2 -M *
Cold Springs 9630 6.5 6.3 103 8.3 8.5 98
Deer Park 9700 11.2 13.1 85 13.7 17.0 81
Hobbs Park 10100 10.0 11.6 86 10.4 11.0 95
Kirwin 9550 8.3 8.4 99 9.5 9.9 96
Little Warm 9370 9.1 9.2 99 11.4 11.1 103
South Pass 9040 10.8 13.6 79 11.7 15.2 77
St. Lawrence Alt 8620 2.8 6.1 46 5.0 7.4 68
Togwotee Pass 9580 20.6 20.5 100 22.6 21.7 104
Townsend Creek 8700 7.6 8.1 94 9.3 10.0 93
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Basin Index (%) 90 91
BIGHORN BASIN
Bald Mtn. 9380 14.6 16.4 89 13.5 14.7 92
Bear Trap Meadow 8200 8.3 5.0 166 9.7 7.0 139
Bone Springs Div 9350 13.4 14.0 96 10.4 13.3 78
Grave Springs 8550 6.9 8.1 85 7.8 8.9 88
Kirwin 9550 8.3 8.4 99 9.5 9.9 96
Marquette 8760 3.7 -M * 5.5 -M *
Middle Powder 7760 10.4 9.6 108 9.0 9.9 91
Owl Creek 8975 4.9 4.6 107 4.9 4.9 100
Powder River Pass 9480 10.9 9.0 121 9.5 10.7 89
Shell Creek 9580 12.9 12.8 101 10.4 11.8 88
Timber Creek 7950 2.8 4.2 67 4.1 6.1 67
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Basin Index (%) 101 91
SHOSHONE RIVER
Blackwater 9780 18.8 20.6 91 20.3 18.0 113
Evening Star 9200 24.8 22.0 113 27.0 24.3 111
Marquette 8760 3.7 -M * 5.5 -M *
Sylvan Lake 8420 16.0 18.0 89 20.3 19.8 103
Sylvan Road 7120 10.3 10.4 99 -M 15.1 *
Younts Peak 8350 13.2 13.4 99 14.2 14.0 101
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Basin Index (%) 98 107
POWDER RIVER
Bear Trap Meadow 8200 8.3 5.0 166 9.7 7.0 139
Cloud Peak Reservoir 9860 13.6 12.8 106 13.6 11.1 123
Grave Springs 8550 6.9 8.1 85 7.8 8.9 88
Hansen Sawmill 8360 8.2 5.6 146 8.8 7.1 124
Middle Powder 7760 10.4 9.6 108 9.0 9.9 91
Powder River Pass 9480 10.9 9.0 121 9.5 10.7 89
Soldier Park 8720 6.2 -M * 9.4 -M *
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Basin Index (%) 116 107
TONGUE RIVER
Big Goose 7990 7.8 7.7 101 10.5 9.2 114
Bone Springs Div 9350 13.4 14.0 96 10.4 13.3 78
Burgess Junction 7880 9.1 9.5 96 11.4 10.4 110
Dome Lake 8880 11.3 10.1 112 11.7 11.4 103
Little Goose 8870 10.4 -M * 12.1 -M *
Sucker Creek 8880 11.8 10.8 109 14.8 12.1 122
Tie Creek 6870 4.4 5.0 88 8.8 9.7 91
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Basin Index (%) 101 102
BELLE FOURCHE
Blind Park 6890 4.9 7.2 68 7.7 10.5 73
Cole Canyon 5910 4.2 5.5 76 6.2 7.8 79
North Rapid Creek 6130 5.7 6.5 88 7.1 8.5 84
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Basin Index (%) 77 78
CHEYENNE RIVER BASIN
Blind Park 6890 4.9 7.2 68 7.7 10.5 73
North Rapid Creek 6130 5.7 6.5 88 7.1 8.5 84
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Basin Index (%) 77 78
UPPER N. PLATTE
Arapaho Ridge 10960 19.2 18.0 107 19.0 19.6 97
Blackhall Mtn 9820 26.5 -M * 25.9 -M *
Cinnabar Park 9574 18.2 17.9 102 19.8 21.2 93
Columbine 9160 21.1 21.9 96 18.6 22.7 82
Divide Peak 8880 15.1 17.5 86 16.4 19.0 86
Joe Wright 10120 18.1 19.0 95 20.9 22.7 92
Laprele Creek 8375 10.2 9.1 112 11.3 10.8 105
Med Bow 10500 36.5 -M * 30.0 -M *
Never Summer 10280 16.0 17.7 90 11.9 -M *
North French Creek 10130 26.5 24.9 106 26.1 23.5 111
Old Battle 10000 26.4 26.2 101 27.9 31.2 89
Rawah 9020 11.0 9.3 118 12.5 12.0 104
Sage Creek Basin 7850 16.5 11.6 142 -M 12.9 *
Sand Lake 10050 26.8 24.4 110 24.7 21.5 115
South Brush Creek 8440 9.4 11.1 85 9.5 13.2 72
Tower 10500 32.8 39.7 83 29.7 35.5 84
Webber Springs 9250 19.1 21.0 91 20.1 23.7 85
Whiskey Park 8950 26.9 24.2 111 24.8 24.8 100
Willow Creek Pass 9540 10.4 10.8 96 9.2 11.6 79
Zirkel 9340 21.3 25.8 83 24.5 25.3 97
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Basin Index (%) 99 93
SWEETWATER
Deer Park 9700 11.2 13.1 85 13.7 17.0 81
Larsen Creek 9000 7.5 11.1 68 8.7 -M *
South Pass 9040 10.8 13.6 79 11.7 15.2 77
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Basin Index (%) 78 79
LOWER N. PLATTE
Casper Mtn. 7900 11.5 12.1 95 9.6 12.6 76
Laprele Creek 8375 10.2 9.1 112 11.3 10.8 105
Reno Hill 8400 13.0 11.9 109 14.0 12.8 109
Windy Peak 7900 11.2 7.0 160 12.1 9.0 134
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Basin Index (%) 114 104
LARAMIE RIVER
Brooklyn Lake 10240 23.4 17.6 133 24.3 18.3 133
Cinnabar Park 9574 18.2 17.9 102 19.8 21.2 93
Crow Creek 8330 5.5 7.0 79 9.6 8.8 109
Deadman Hill 10220 17.5 13.8 127 16.2 14.9 109
Rawah 9020 11.0 9.3 118 12.5 12.0 104
Roach 9700 14.7 13.9 106 15.8 16.8 94
Windy Peak 7900 11.2 7.0 160 12.1 9.0 134
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Basin Index (%) 117 109
S. PLATTE
Crow Creek 8330 5.5 7.0 79 9.6 8.8 109
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Basin Index (%) 79 109
LITTLE SNAKE RIVER
Battle Mountain 7440 8.4 11.3 74 11.6 13.4 87
Divide Peak 8880 15.1 17.5 86 16.4 19.0 86
Elk River 8700 15.6 17.3 90 11.9 17.9 66
Elkhead Divide 8780 14.7 -M * 15.5 -M *
Little Snake River 8915 21.7 21.0 103 26.9 26.3 102
Old Battle 10000 26.4 26.2 101 27.9 31.2 89
Sage Creek Basin 7850 16.5 11.6 142 -M 12.9 *
Sandstone RS 8150 12.1 12.0 101 13.1 16.6 79
Whiskey Park 8950 26.9 24.2 111 24.8 24.8 100
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Basin Index (%) 101 89
UPPER GREEN RIVER
Big Sandy Opening 9080 9.2 11.6 79 8.5 11.7 73
Blind Bull Sum 8650 18.9 20.4 93 12.7 17.6 72
East Rim Divide 7930 8.6 9.5 91 8.1 10.5 77
Elkhart Park G.S. 9400 8.9 10.6 84 7.8 11.8 66
Gros Ventre Summit 8750 9.2 11.6 79 9.6 11.4 84
Gunsight Pass 9820 10.8 12.0 90 10.2 12.0 85
Indian Creek 9425 17.7 21.2 83 15.9 20.0 80
Kendall R.S. 7740 11.0 11.2 98 12.1 12.9 94
Larsen Creek 9000 7.5 11.1 68 8.7 -M *
Loomis Park 8240 11.6 13.3 87 12.9 15.5 83
New Fork Lake 8340 8.6 9.3 92 9.3 9.7 96
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 10.3 11.0 94 12.2 12.7 96
Spring Creek Divide 9000 20.5 20.9 98 20.6 21.3 97
Triple Peak 8500 20.3 19.3 105 21.2 22.6 94
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Basin Index (%) 90 85
LOWER GREEN RIVER
Blacks Fork Jct 8869 7.1 -M * 9.4 -M *
Buck Pasture 9632 12.4 -M * 13.0 -M *
EF Blacks Fork GS 9360 12.1 -M * 10.4 -M *
Hams Fork 7840 9.8 10.2 96 9.2 10.1 91
Henrys Fork 10182 -M -M * 11.1 -M *
Hewinta 9500 10.4 9.8 106 12.4 12.2 102
Hickerson Park 9122 9.1 6.6 138 9.8 8.8 111
Hole-in-Rock 9168 8.1 6.6 123 10.2 8.2 124
Indian Creek 9425 17.7 21.2 83 15.9 20.0 80
Kelley R.S. 8180 11.6 13.3 87 13.0 16.1 81
Spirit Lk 10235 12.1 -M * 13.0 -M *
Steel Creek Park 10158 13.9 13.4 104 15.1 14.2 106
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Basin Index (%) 99 96
UPPER BEAR RIVER
Bear River RS 8777 7.6 -M * 9.8 -M *
Bug Lake 7987 13.8 16.6 83 12.9 17.3 75
Burts Miller Ranch 8000 5.6 -M * 7.0 -M *
Chalk Creek #1 9171 14.5 21.0 69 15.3 22.0 70
Dry Bread Pond 8302 12.6 17.4 72 13.2 17.4 76
Giveout 6930 7.1 8.8 81 9.3 11.3 82
Hayden Fork 9130 12.0 14.2 85 16.5 18.4 90
Kelley R.S. 8180 11.6 13.3 87 13.0 16.1 81
Lily Lake 9133 10.3 11.4 90 10.7 14.9 72
Monte Cristo 8932 17.5 24.2 72 16.7 23.0 73
Salt River Summit 7640 10.9 12.0 91 12.0 14.9 81
Spring Creek Divide 9000 20.5 20.9 98 20.6 21.3 97
Trial Lake 9992 16.2 19.8 82 15.4 21.2 73
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Basin Index (%) 82 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.
