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 15 , 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 15.4 14.2 108 17.3 18.6 93
Blind Bull Sum 8650 18.8 20.0 94 12.6 17.2 73
Cottonwood Creek 7670 19.3 18.9 102 21.8 21.2 103
East Rim Divide 7930 8.2 9.5 86 8.0 10.3 78
Grand Targhee 9260 32.2 32.5 99 25.6 26.5 97
Granite Creek 6770 14.7 14.9 99 15.7 17.7 89
Grassy Lake 7265 25.8 28.5 91 28.1 31.8 88
Gros Ventre Summit 8750 7.7 11.1 69 9.5 11.1 86
Gunsight Pass 9820 10.6 11.7 91 10.0 11.9 84
Lewis Lake Divide 7850 24.5 27.2 90 27.0 31.3 86
Loomis Park 8240 11.5 13.0 88 12.8 15.1 85
Phillips Bench 8200 21.4 21.8 98 22.6 24.6 92
Salt River Summit 7640 10.8 11.6 93 12.0 14.5 83
Snake River Station 6920 14.3 15.2 94 17.9 19.9 90
Somsen Ranch 6800 10.5 11.7 90 12.3 14.6 84
Spring Creek Divide 9000 20.2 20.1 100 20.3 20.8 98
Thumb Divide 7980 12.2 13.6 90 12.2 16.0 76
Togwotee Pass 9580 20.4 20.0 102 22.5 21.1 107
Triple Peak 8500 20.1 19.0 106 21.1 22.0 96
Two Ocean Plateau 9240 -M 23.5 * -M 23.7 *
Willow Creek 8080 24.5 24.7 99 24.2 29.1 83
Younts Peak 8350 13.2 12.8 103 14.2 13.7 104
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Basin Index (%) 96 90
MADISON HEADWATERS IN WYOMING
Black Bear 8170 26.5 32.0 83 27.1 33.7 80
Canyon 7870 11.3 11.6 97 12.3 14.2 87
Madison Plateau 7750 17.2 19.8 87 17.8 23.1 77
West Yellowstone 6700 9.4 9.9 95 11.3 12.5 90
Whiskey Creek 6800 12.1 13.6 89 15.3 17.7 86
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Basin Index (%) 88 83
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 19.2 18.6 103 18.8 17.1 110
Canyon 7870 11.3 11.6 97 12.3 14.2 87
Evening Star 9200 24.9 21.6 115 26.9 23.7 114
Fisher Creek 9100 27.9 27.7 101 29.6 27.7 107
Monument Peak 8850 19.0 16.3 117 21.4 18.6 115
Northeast Entrance 7350 8.2 8.7 94 13.7 10.7 128
Parker Peak 9400 20.4 17.1 119 20.5 15.3 134
Sylvan Lake 8420 16.1 17.5 92 20.3 19.4 105
Thumb Divide 7980 12.2 13.6 90 12.2 16.0 76
Two Ocean Plateau 9240 -M 23.5 * -M 23.7 *
White Mill 8700 23.4 19.4 121 22.2 20.6 108
Wolverine 7650 9.6 8.8 109 14.7 10.7 137
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Basin Index (%) 106 110
WIND RIVER
Burroughs Creek 8750 10.5 -M * 13.5 -M *
Castle Creek 8400 5.4 -M * 7.2 -M *
Cold Springs 9630 6.3 6.1 103 8.0 8.2 98
Deer Park 9700 10.8 12.3 88 13.2 16.6 80
Hobbs Park 10100 9.5 11.2 85 9.8 10.6 92
Kirwin 9550 8.2 8.1 101 9.4 9.6 98
Little Warm 9370 9.0 9.0 100 11.3 10.8 105
South Pass 9040 10.5 12.9 81 11.3 14.8 76
St. Lawrence Alt 8620 2.5 5.9 42 4.8 7.2 67
Togwotee Pass 9580 20.4 20.0 102 22.5 21.1 107
Townsend Creek 8700 7.2 7.6 95 8.8 9.6 92
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Basin Index (%) 91 91
BIGHORN BASIN
Bald Mtn. 9380 14.5 16.2 90 13.2 14.3 92
Bear Trap Meadow 8200 7.8 4.8 162 9.2 6.8 135
Bone Springs Div 9350 13.0 13.6 96 10.0 12.8 78
Grave Springs 8550 6.2 7.7 81 7.0 8.6 81
Kirwin 9550 8.2 8.1 101 9.4 9.6 98
Marquette 8760 3.6 -M * 5.4 -M *
Middle Powder 7760 9.1 9.1 100 8.3 9.6 86
Owl Creek 8975 4.8 4.5 107 4.8 4.7 102
Powder River Pass 9480 10.3 8.8 117 9.1 10.4 88
Shell Creek 9580 12.6 12.5 101 10.2 11.4 89
Timber Creek 7950 2.8 4.2 67 4.0 5.8 69
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Basin Index (%) 100 91
SHOSHONE RIVER
Blackwater 9780 18.6 19.7 94 20.2 17.6 115
Evening Star 9200 24.9 21.6 115 26.9 23.7 114
Marquette 8760 3.6 -M * 5.4 -M *
Sylvan Lake 8420 16.1 17.5 92 20.3 19.4 105
Sylvan Road 7120 10.6 10.2 104 10.9 14.8 74
Younts Peak 8350 13.2 12.8 103 14.2 13.7 104
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Basin Index (%) 102 104
POWDER RIVER
Bear Trap Meadow 8200 7.8 4.8 162 9.2 6.8 135
Cloud Peak Reservoir 9860 12.7 12.2 104 12.8 10.6 121
Grave Springs 8550 6.2 7.7 81 7.0 8.6 81
Hansen Sawmill 8360 8.0 5.3 151 8.5 6.8 125
Middle Powder 7760 9.1 9.1 100 8.3 9.6 86
Powder River Pass 9480 10.3 8.8 117 9.1 10.4 88
Soldier Park 8720 5.8 -M * 9.0 -M *
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Basin Index (%) 113 104
TONGUE RIVER
Big Goose 7990 6.9 7.4 93 9.6 8.7 110
Bone Springs Div 9350 13.0 13.6 96 10.0 12.8 78
Burgess Junction 7880 8.4 9.4 89 10.8 10.0 108
Dome Lake 8880 10.6 9.7 109 10.9 10.9 100
Little Goose 8870 9.1 -M * 11.0 -M *
Sucker Creek 8880 11.0 10.4 106 13.8 11.7 118
Tie Creek 6870 4.0 4.7 85 8.2 9.3 88
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Basin Index (%) 98 100
BELLE FOURCHE
Blind Park 6890 4.9 7.1 69 7.6 10.2 75
Cole Canyon 5910 3.8 5.4 70 6.0 7.7 78
North Rapid Creek 6130 5.5 6.4 86 7.1 8.3 86
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Basin Index (%) 75 79
CHEYENNE RIVER BASIN
Blind Park 6890 4.9 7.1 69 7.6 10.2 75
North Rapid Creek 6130 5.5 6.4 86 7.1 8.3 86
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Basin Index (%) 77 79
UPPER N. PLATTE
Arapaho Ridge 10960 18.7 18.0 104 18.5 19.0 97
Blackhall Mtn 9820 26.2 -M * 25.7 -M *
Cinnabar Park 9574 17.8 17.8 100 19.4 20.8 93
Columbine 9160 20.9 21.5 97 18.3 22.2 82
Divide Peak 8880 14.7 17.2 85 16.1 18.4 88
Joe Wright 10120 17.6 18.7 94 20.4 22.0 93
Laprele Creek 8375 9.7 8.8 110 10.8 10.4 104
Med Bow 10500 36.1 -M * 29.8 -M *
Never Summer 10280 15.7 17.3 91 11.5 -M *
North French Creek 10130 26.1 23.9 109 25.7 23.0 112
Old Battle 10000 26.2 26.0 101 27.6 30.5 90
Rawah 9020 10.8 9.2 117 12.3 11.6 106
Sage Creek Basin 7850 16.5 11.8 140 9.4 12.8 73
Sand Lake 10050 26.3 23.5 112 24.3 20.9 116
South Brush Creek 8440 9.4 11.2 84 9.3 12.9 72
Tower 10500 32.2 38.9 83 29.6 34.6 86
Webber Springs 9250 18.1 20.5 88 19.8 23.1 86
Whiskey Park 8950 26.7 23.8 112 24.4 24.4 100
Willow Creek Pass 9540 10.1 10.5 96 8.8 11.3 78
Zirkel 9340 21.0 25.5 82 24.1 24.8 97
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Basin Index (%) 98 93
SWEETWATER
Deer Park 9700 10.8 12.3 88 13.2 16.6 80
Larsen Creek 9000 7.6 10.7 71 8.6 -M *
South Pass 9040 10.5 12.9 81 11.3 14.8 76
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Basin Index (%) 81 78
LOWER N. PLATTE
Casper Mtn. 7900 10.7 11.8 91 8.8 12.3 72
Laprele Creek 8375 9.7 8.8 110 10.8 10.4 104
Reno Hill 8400 12.1 11.5 105 13.0 12.4 105
Windy Peak 7900 10.8 6.7 161 -M 8.7 *
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Basin Index (%) 112 93
LARAMIE RIVER
Brooklyn Lake 10240 23.1 17.3 134 24.0 17.8 135
Cinnabar Park 9574 17.8 17.8 100 19.4 20.8 93
Crow Creek 8330 5.2 7.1 73 9.4 8.6 109
Deadman Hill 10220 -M 13.4 * 15.9 14.3 111
Rawah 9020 10.8 9.2 117 12.3 11.6 106
Roach 9700 14.4 13.5 107 15.5 16.3 95
Windy Peak 7900 10.8 6.7 161 -M 8.7 *
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Basin Index (%) 115 108
S. PLATTE
Crow Creek 8330 5.2 7.1 73 9.4 8.6 109
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Basin Index (%) 73 109
LITTLE SNAKE RIVER
Battle Mountain 7440 8.3 10.9 76 11.6 13.2 88
Divide Peak 8880 14.7 17.2 85 16.1 18.4 88
Elk River 8700 15.3 17.2 89 11.4 17.4 66
Elkhead Divide 8780 14.6 -M * 15.4 -M *
Little Snake River 8915 21.3 20.5 104 26.8 26.1 103
Old Battle 10000 26.2 26.0 101 27.6 30.5 90
Sage Creek Basin 7850 16.5 11.8 140 9.4 12.8 73
Sandstone RS 8150 11.8 11.6 102 13.0 16.3 80
Whiskey Park 8950 26.7 23.8 112 24.4 24.4 100
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Basin Index (%) 101 88
UPPER GREEN RIVER
Big Sandy Opening 9080 9.2 11.1 83 8.5 11.4 75
Blind Bull Sum 8650 18.8 20.0 94 12.6 17.2 73
East Rim Divide 7930 8.2 9.5 86 8.0 10.3 78
Elkhart Park G.S. 9400 8.7 10.3 84 7.5 11.4 66
Gros Ventre Summit 8750 7.7 11.1 69 9.5 11.1 86
Gunsight Pass 9820 10.6 11.7 91 10.0 11.9 84
Indian Creek 9425 17.1 20.7 83 15.2 19.3 79
Kendall R.S. 7740 10.8 10.9 99 11.7 12.6 93
Larsen Creek 9000 7.6 10.7 71 8.6 -M *
Loomis Park 8240 11.5 13.0 88 12.8 15.1 85
New Fork Lake 8340 8.2 9.2 89 9.0 9.5 95
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 10.5 10.8 97 12.1 12.4 98
Spring Creek Divide 9000 20.2 20.1 100 20.3 20.8 98
Triple Peak 8500 20.1 19.0 106 21.1 22.0 96
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Basin Index (%) 90 86
LOWER GREEN RIVER
Blacks Fork Jct 8869 7.2 -M * 9.4 -M *
Buck Pasture 9632 12.1 -M * 12.7 -M *
EF Blacks Fork GS 9360 9.7 -M * 10.4 -M *
Hams Fork 7840 10.0 10.1 99 9.1 9.8 93
Henrys Fork 10182 -M -M * -M -M *
Hewinta 9500 10.6 9.1 116 12.4 11.9 104
Hickerson Park 9122 9.1 6.6 138 9.8 8.5 115
Hole-in-Rock 9168 8.1 6.3 129 10.2 7.9 129
Indian Creek 9425 17.1 20.7 83 15.2 19.3 79
Kelley R.S. 8180 11.6 12.9 90 13.0 15.7 83
Spirit Lk 10235 12.1 -M * 13.0 -M *
Steel Creek Park 10158 13.8 13.0 106 15.1 13.8 109
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Basin Index (%) 102 98
UPPER BEAR RIVER
Bear River RS 8777 7.5 -M * 9.6 -M *
Bug Lake 7987 13.9 16.4 85 12.9 16.9 76
Burts Miller Ranch 8000 5.4 -M * 7.1 -M *
Chalk Creek #1 9171 13.9 20.5 68 14.7 21.4 69
Dry Bread Pond 8302 13.2 17.1 77 13.2 17.0 78
Giveout 6930 7.6 8.9 85 9.3 11.1 84
Hayden Fork 9130 11.2 14.0 80 15.5 17.9 87
Kelley R.S. 8180 11.6 12.9 90 13.0 15.7 83
Lily Lake 9133 9.9 11.3 88 10.4 14.5 72
Monte Cristo 8932 17.7 23.5 75 16.6 22.4 74
Salt River Summit 7640 10.8 11.6 93 12.0 14.5 83
Spring Creek Divide 9000 20.2 20.1 100 20.3 20.8 98
Trial Lake 9992 15.3 19.6 78 14.6 20.7 71
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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.
