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: APRIL 4 , 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 15.0 104 17.8 20.4 87
Blind Bull Sum 8650 19.9 23.0 87 13.1 19.1 69
Cottonwood Creek 7670 19.8 21.2 93 23.0 24.1 95
East Rim Divide 7930 8.0 10.2 78 8.4 11.5 73
Grand Targhee 9260 35.1 37.6 93 27.8 30.2 92
Granite Creek 6770 15.2 14.7 103 15.7 19.3 81
Grassy Lake 7265 27.9 31.6 88 30.6 35.2 87
Gros Ventre Summit 8750 9.1 13.0 70 9.9 12.6 79
Gunsight Pass 9820 11.0 13.6 81 10.7 13.4 80
Lewis Lake Divide 7850 23.5 29.6 79 28.7 34.6 83
Loomis Park 8240 11.2 14.0 80 13.2 16.9 78
Phillips Bench 8200 22.2 24.7 90 23.4 27.5 85
Salt River Summit 7640 10.5 13.0 81 12.5 16.3 77
Snake River Station 6920 14.8 15.1 98 19.0 21.9 87
Somsen Ranch 6800 10.1 11.3 89 13.3 16.2 82
Spring Creek Divide 9000 21.2 22.5 94 21.5 23.3 92
Thumb Divide 7980 12.5 14.7 85 13.4 18.1 74
Togwotee Pass 9580 20.5 21.8 94 23.9 23.7 101
Triple Peak 8500 20.8 21.9 95 22.0 24.8 89
Two Ocean Plateau 9240 24.5 25.7 95 14.3 26.5 54
Willow Creek 8080 23.4 28.2 83 25.6 32.8 78
Younts Peak 8350 14.3 14.2 101 15.2 15.4 99
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Basin Index (%) 90 83
MADISON HEADWATERS IN WYOMING
Black Bear 8170 26.1 37.0 71 29.8 37.3 80
Canyon 7870 12.2 12.4 98 13.8 15.8 87
Madison Plateau 7750 19.7 21.4 92 19.9 25.6 78
West Yellowstone 6700 10.2 10.0 102 12.7 13.8 92
Whiskey Creek 6800 13.5 15.0 90 17.0 19.6 87
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Basin Index (%) 85 83
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.3 21.2 96 20.0 19.2 104
Canyon 7870 12.2 12.4 98 13.8 15.8 87
Evening Star 9200 25.8 23.8 108 28.4 26.5 107
Fisher Creek 9100 29.3 30.8 95 31.7 30.8 103
Monument Peak 8850 20.8 19.3 108 23.6 21.1 112
Northeast Entrance 7350 -M 9.2 * -M 11.9 *
Parker Peak 9400 23.9 19.1 125 22.9 17.1 134
Sylvan Lake 8420 17.2 19.3 89 21.9 21.7 101
Thumb Divide 7980 12.5 14.7 85 13.4 18.1 74
Two Ocean Plateau 9240 24.5 25.7 95 14.3 26.5 54
White Mill 8700 24.7 21.9 113 23.7 23.1 103
Wolverine 7650 9.5 9.4 101 15.4 11.9 129
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Basin Index (%) 101 99
WIND RIVER
Burroughs Creek 8750 9.8 -M * 14.2 -M *
Castle Creek 8400 5.1 -M * 7.4 -M *
Cold Springs 9630 6.1 7.0 87 9.0 9.7 93
Deer Park 9700 11.8 15.1 78 15.0 19.3 78
Hobbs Park 10100 11.7 13.8 85 12.4 13.0 95
Kirwin 9550 8.7 9.5 92 10.6 11.2 95
Little Warm 9370 9.5 10.2 93 12.2 12.5 98
South Pass 9040 11.6 15.1 77 13.1 17.0 77
St. Lawrence Alt 8620 2.9 6.8 43 5.8 8.7 67
Togwotee Pass 9580 20.5 21.8 94 23.9 23.7 101
Townsend Creek 8700 8.9 9.3 96 11.1 11.7 95
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Basin Index (%) 84 89
BIGHORN BASIN
Bald Mtn. 9380 16.3 18.9 86 15.2 16.5 92
Bear Trap Meadow 8200 8.6 5.1 169 10.5 8.2 128
Bone Springs Div 9350 15.3 16.4 93 11.9 15.1 79
Grave Springs 8550 7.3 9.1 80 8.5 10.2 83
Kirwin 9550 8.7 9.5 92 10.6 11.2 95
Marquette 8760 4.4 -M * 6.9 -M *
Middle Powder 7760 11.3 11.7 97 9.8 11.3 87
Owl Creek 8975 5.1 5.7 89 5.9 5.9 100
Powder River Pass 9480 11.1 10.1 110 10.8 12.2 89
Shell Creek 9580 -M 14.8 * -M 13.4 *
Timber Creek 7950 3.1 4.9 63 5.0 7.2 69
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Basin Index (%) 95 90
SHOSHONE RIVER
Blackwater 9780 19.8 22.3 89 21.9 20.0 110
Evening Star 9200 25.8 23.8 108 28.4 26.5 107
Marquette 8760 4.4 -M * 6.9 -M *
Sylvan Lake 8420 17.2 19.3 89 21.9 21.7 101
Sylvan Road 7120 8.4 11.0 76 -M 16.3 *
Younts Peak 8350 14.3 14.2 101 15.2 15.4 99
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Basin Index (%) 94 105
POWDER RIVER
Bear Trap Meadow 8200 8.6 5.1 169 10.5 8.2 128
Cloud Peak Reservoir 9860 15.6 14.4 108 15.6 12.9 121
Grave Springs 8550 7.3 9.1 80 8.5 10.2 83
Hansen Sawmill 8360 9.1 6.2 147 10.4 8.3 125
Middle Powder 7760 11.3 11.7 97 9.8 11.3 87
Powder River Pass 9480 11.1 10.1 110 10.8 12.2 89
Soldier Park 8720 7.4 -M * 10.9 -M *
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Basin Index (%) 111 104
TONGUE RIVER
Big Goose 7990 9.2 9.3 99 11.9 11.1 107
Bone Springs Div 9350 15.3 16.4 93 11.9 15.1 79
Burgess Junction 7880 10.7 11.6 92 13.0 12.0 108
Dome Lake 8880 12.8 11.6 110 13.5 13.2 102
Little Goose 8870 11.9 -M * 13.9 -M *
Sucker Creek 8880 13.3 11.8 113 17.0 14.0 121
Tie Creek 6870 5.0 5.5 91 10.5 11.3 93
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Basin Index (%) 100 101
BELLE FOURCHE
Blind Park 6890 2.5 7.1 35 8.4 11.5 73
Cole Canyon 5910 2.7 5.6 48 6.7 9.1 74
North Rapid Creek 6130 4.9 6.7 73 7.8 9.5 82
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Basin Index (%) 52 76
CHEYENNE RIVER BASIN
Blind Park 6890 2.5 7.1 35 8.4 11.5 73
North Rapid Creek 6130 4.9 6.7 73 7.8 9.5 82
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Basin Index (%) 54 77
UPPER N. PLATTE
Arapaho Ridge 10960 20.8 20.4 102 20.4 21.8 94
Blackhall Mtn 9820 27.6 -M * 27.0 -M *
Cinnabar Park 9574 18.1 20.6 88 20.7 23.6 88
Columbine 9160 21.0 23.3 90 19.9 25.0 80
Divide Peak 8880 15.8 19.7 80 17.5 21.0 83
Joe Wright 10120 19.4 20.6 94 22.4 25.2 89
Laprele Creek 8375 10.3 9.4 110 12.4 12.2 102
Med Bow 10500 35.7 -M * 31.5 -M *
Never Summer 10280 17.1 20.0 86 13.0 -M *
North French Creek 10130 27.7 28.7 97 27.5 26.1 105
Old Battle 10000 28.1 30.7 92 29.6 34.2 87
Rawah 9020 10.6 10.4 102 13.4 13.8 97
Sage Creek Basin 7850 16.7 12.5 134 10.0 14.2 70
Sand Lake 10050 28.9 28.3 102 26.4 24.2 109
South Brush Creek 8440 8.6 12.1 71 10.3 14.9 69
Tower 10500 34.2 45.1 76 32.8 38.9 84
Webber Springs 9250 19.1 23.0 83 21.3 26.1 82
Whiskey Park 8950 28.0 26.8 104 25.9 27.3 95
Willow Creek Pass 9540 11.4 12.0 95 10.3 13.1 79
Zirkel 9340 20.9 26.3 79 -M 27.8 *
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Basin Index (%) 91 89
SWEETWATER
Deer Park 9700 11.8 15.1 78 15.0 19.3 78
Larsen Creek 9000 6.7 11.9 56 8.9 -M *
South Pass 9040 11.6 15.1 77 13.1 17.0 77
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Basin Index (%) 71 77
LOWER N. PLATTE
Casper Mtn. 7900 13.0 14.0 93 11.2 14.4 78
Laprele Creek 8375 10.3 9.4 110 12.4 12.2 102
Reno Hill 8400 14.8 13.7 108 15.8 14.9 106
Windy Peak 7900 11.7 7.8 150 13.0 10.2 127
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Basin Index (%) 111 101
LARAMIE RIVER
Brooklyn Lake 10240 24.2 21.0 115 25.6 20.6 124
Cinnabar Park 9574 18.1 20.6 88 20.7 23.6 88
Crow Creek 8330 4.9 7.0 70 10.0 10.5 95
Deadman Hill 10220 19.0 15.9 119 17.4 16.9 103
Rawah 9020 10.6 10.4 102 13.4 13.8 97
Roach 9700 15.2 16.1 94 17.2 18.8 91
Windy Peak 7900 11.7 7.8 150 13.0 10.2 127
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Basin Index (%) 105 103
S. PLATTE
Crow Creek 8330 4.9 7.0 70 10.0 10.5 95
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Basin Index (%) 70 95
LITTLE SNAKE RIVER
Battle Mountain 7440 7.7 10.2 75 12.4 14.7 84
Divide Peak 8880 15.8 19.7 80 17.5 21.0 83
Elk River 8700 14.9 19.1 78 12.8 19.6 65
Elkhead Divide 8780 14.8 -M * 16.7 -M *
Little Snake River 8915 21.7 24.2 90 28.5 29.1 98
Old Battle 10000 28.1 30.7 92 29.6 34.2 87
Sage Creek Basin 7850 16.7 12.5 134 10.0 14.2 70
Sandstone RS 8150 10.5 12.9 81 13.8 18.0 77
Whiskey Park 8950 28.0 26.8 104 25.9 27.3 95
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Basin Index (%) 92 85
UPPER GREEN RIVER
Big Sandy Opening 9080 9.5 12.4 77 8.5 12.9 66
Blind Bull Sum 8650 19.9 23.0 87 13.1 19.1 69
East Rim Divide 7930 8.0 10.2 78 8.4 11.5 73
Elkhart Park G.S. 9400 9.1 12.2 75 8.2 13.0 63
Gros Ventre Summit 8750 9.1 13.0 70 9.9 12.6 79
Gunsight Pass 9820 11.0 13.6 81 10.7 13.4 80
Indian Creek 9425 18.2 24.3 75 17.0 22.1 77
Kendall R.S. 7740 10.4 11.5 90 12.3 13.9 88
Larsen Creek 9000 6.7 11.9 56 8.9 -M *
Loomis Park 8240 11.2 14.0 80 13.2 16.9 78
New Fork Lake 8340 8.3 10.3 81 9.5 10.5 90
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 10.4 12.3 85 12.6 13.9 91
Spring Creek Divide 9000 21.2 22.5 94 21.5 23.3 92
Triple Peak 8500 20.8 21.9 95 22.0 24.8 89
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Basin Index (%) 82 80
LOWER GREEN RIVER
Blacks Fork Jct 8869 7.1 -M * 10.0 -M *
Buck Pasture 9632 12.5 -M * 13.8 -M *
EF Blacks Fork GS 9360 12.0 -M * 11.0 -M *
Hams Fork 7840 8.8 10.9 81 9.8 11.1 88
Henrys Fork 10182 -M -M * 11.8 -M *
Hewinta 9500 11.2 11.0 102 13.0 13.7 95
Hickerson Park 9122 9.3 7.7 121 10.7 10.0 107
Hole-in-Rock 9168 7.6 6.9 110 11.0 9.4 117
Indian Creek 9425 18.2 24.3 75 17.0 22.1 77
Kelley R.S. 8180 12.1 15.0 81 13.7 17.7 77
Spirit Lk 10235 12.7 -M * 14.3 -M *
Steel Creek Park 10158 14.6 15.6 94 16.1 16.1 100
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Basin Index (%) 89 91
UPPER BEAR RIVER
Bear River RS 8777 7.0 -M * 10.6 -M *
Bug Lake 7987 13.2 18.2 73 13.8 19.0 73
Burts Miller Ranch 8000 5.5 -M * 7.5 -M *
Chalk Creek #1 9171 15.4 23.9 64 16.8 24.7 68
Dry Bread Pond 8302 12.3 18.2 68 14.3 19.1 75
Giveout 6930 5.7 8.5 67 9.5 12.2 78
Hayden Fork 9130 10.9 15.3 71 17.4 20.6 84
Kelley R.S. 8180 12.1 15.0 81 13.7 17.7 77
Lily Lake 9133 9.4 12.4 76 11.5 16.7 69
Monte Cristo 8932 17.6 27.2 65 18.1 25.4 71
Salt River Summit 7640 10.5 13.0 81 12.5 16.3 77
Spring Creek Divide 9000 21.2 22.5 94 21.5 23.3 92
Trial Lake 9992 17.1 21.6 79 16.1 23.5 69
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Basin Index (%) 74 76
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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.
