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 TUESDAY: APRIL 27 , 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 10.2 10.4 98 18.8 22.3 84
Blind Bull Sum 8650 20.2 24.1 84 13.9 20.8 67
Cottonwood Creek 7670 16.2 16.7 97 24.6 26.8 92
East Rim Divide 7930 .6 8.8 7 9.4 12.5 75
Grand Targhee 9260 39.1 43.6 90 30.3 33.6 90
Granite Creek 6770 10.2 9.0 113 -M 20.8 *
Grassy Lake 7265 23.9 30.0 80 32.3 38.5 84
Gros Ventre Summit 8750 9.3 12.1 77 11.4 14.2 80
Gunsight Pass 9820 11.3 13.3 85 12.8 15.5 83
Lewis Lake Divide 7850 22.8 30.7 74 30.1 37.8 80
Loomis Park 8240 8.9 11.5 77 14.8 18.5 80
Phillips Bench 8200 20.0 25.6 78 24.4 30.0 81
Salt River Summit 7640 8.9 8.2 109 14.1 18.0 78
Snake River Station 6920 5.2 9.4 55 20.2 24.2 83
Somsen Ranch 6800 4.1 3.1 132 14.8 17.9 83
Spring Creek Divide 9000 22.6 24.0 94 23.5 25.6 92
Thumb Divide 7980 7.3 13.9 53 14.7 20.4 72
Togwotee Pass 9580 23.3 24.6 95 25.8 26.6 97
Triple Peak 8500 16.8 18.8 89 23.8 27.3 87
Two Ocean Plateau 9240 26.0 29.3 89 23.1 29.5 78
Willow Creek 8080 19.3 24.9 78 27.6 36.7 75
Younts Peak 8350 14.0 15.1 93 16.6 17.2 97
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Basin Index (%) 84 83
MADISON HEADWATERS IN WYOMING
Black Bear 8170 -M 37.0 * 32.0 41.1 78
Canyon 7870 12.0 11.5 104 14.1 17.6 80
Madison Plateau 7750 18.7 22.2 84 21.5 28.3 76
West Yellowstone 6700 1.8 4.2 43 -M 15.6 *
Whiskey Creek 6800 12.3 15.4 80 18.2 21.9 83
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Basin Index (%) 84 79
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 21.7 23.4 93 21.1 21.4 99
Canyon 7870 12.0 11.5 104 14.1 17.6 80
Evening Star 9200 27.1 24.6 110 30.4 29.7 102
Fisher Creek 9100 31.2 33.2 94 34.8 34.4 101
Monument Peak 8850 22.5 20.7 109 26.3 23.8 111
Northeast Entrance 7350 1.5 4.6 33 15.4 13.4 115
Parker Peak 9400 24.5 21.8 112 24.5 19.6 125
Sylvan Lake 8420 13.8 20.3 68 23.3 24.5 95
Thumb Divide 7980 7.3 13.9 53 14.7 20.4 72
Two Ocean Plateau 9240 26.0 29.3 89 23.1 29.5 78
White Mill 8700 26.0 23.7 110 25.4 25.7 99
Wolverine 7650 6.2 4.8 129 17.1 13.4 128
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Basin Index (%) 95 99
WIND RIVER
Burroughs Creek 8750 11.3 -M * 16.9 -M *
Castle Creek 8400 5.3 -M * 10.0 -M *
Cold Springs 9630 -M 2.4 * -M 11.9 *
Deer Park 9700 14.2 16.3 87 18.2 22.9 79
Hobbs Park 10100 15.2 15.8 96 16.4 16.2 101
Kirwin 9550 11.9 10.2 117 13.3 13.3 100
Little Warm 9370 10.4 9.2 113 14.4 14.7 98
South Pass 9040 13.6 15.2 89 15.2 19.8 77
St. Lawrence Alt 8620 3.6 4.2 86 8.7 11.0 79
Togwotee Pass 9580 23.3 24.6 95 25.8 26.6 97
Townsend Creek 8700 11.1 8.4 132 14.2 14.5 98
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Basin Index (%) 99 91
BIGHORN BASIN
Bald Mtn. 9380 19.6 20.6 95 18.3 19.1 96
Bear Trap Meadow 8200 8.6 1.6 538 12.8 10.1 127
Bone Springs Div 9350 19.3 16.5 117 14.5 17.6 82
Grave Springs 8550 8.2 9.1 90 10.2 12.3 83
Kirwin 9550 11.9 10.2 117 13.3 13.3 100
Marquette 8760 8.6 -M * 10.4 -M *
Middle Powder 7760 13.8 12.2 113 12.2 13.7 89
Owl Creek 8975 6.9 2.0 345 9.1 7.5 121
Powder River Pass 9480 12.2 10.0 122 13.0 14.5 90
Shell Creek 9580 17.5 15.9 110 14.4 15.7 92
Timber Creek 7950 5.4 3.6 150 9.4 9.3 101
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Basin Index (%) 121 96
SHOSHONE RIVER
Blackwater 9780 22.2 24.7 90 23.6 22.8 104
Evening Star 9200 27.1 24.6 110 30.4 29.7 102
Marquette 8760 8.6 -M * 10.4 -M *
Sylvan Lake 8420 13.8 20.3 68 23.3 24.5 95
Sylvan Road 7120 .2 7.5 3 14.4 18.1 80
Younts Peak 8350 14.0 15.1 93 16.6 17.2 97
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Basin Index (%) 84 96
POWDER RIVER
Bear Trap Meadow 8200 8.6 1.6 538 12.8 10.1 127
Cloud Peak Reservoir 9860 18.1 16.5 110 19.4 16.0 121
Grave Springs 8550 8.2 9.1 90 10.2 12.3 83
Hansen Sawmill 8360 10.9 3.8 287 13.0 10.3 126
Middle Powder 7760 13.8 12.2 113 12.2 13.7 89
Powder River Pass 9480 12.2 10.0 122 13.0 14.5 90
Soldier Park 8720 9.3 -M * 13.6 -M *
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Basin Index (%) 135 105
TONGUE RIVER
Big Goose 7990 11.8 9.1 130 15.2 13.5 113
Bone Springs Div 9350 19.3 16.5 117 14.5 17.6 82
Burgess Junction 7880 14.6 12.3 119 17.0 14.3 119
Dome Lake 8880 14.8 11.7 126 16.7 15.9 105
Little Goose 8870 15.4 -M * 17.9 -M *
Sucker Creek 8880 16.4 12.5 131 20.9 16.7 125
Tie Creek 6870 6.5 3.0 217 14.0 13.7 102
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Basin Index (%) 128 107
BELLE FOURCHE
Blind Park 6890 .3 2.7 11 10.9 13.8 79
Cole Canyon 5910 2.2 .4 550* 9.6 11.2 86
North Rapid Creek 6130 4.2 2.7 156 11.0 11.8 93
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Basin Index (%) 116 86
CHEYENNE RIVER BASIN
Blind Park 6890 .3 2.7 11 10.9 13.8 79
North Rapid Creek 6130 4.2 2.7 156 11.0 11.8 93
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Basin Index (%) 83 86
UPPER N. PLATTE
Arapaho Ridge 10960 21.2 22.1 96 22.4 25.7 87
Blackhall Mtn 9820 27.8 -M * 28.7 -M *
Cinnabar Park 9574 18.0 20.1 90 22.5 26.4 85
Columbine 9160 15.2 19.9 76 21.4 27.9 77
Divide Peak 8880 13.0 17.9 73 18.5 23.8 78
Joe Wright 10120 21.8 23.4 93 25.7 29.2 88
Laprele Creek 8375 9.2 7.1 130 13.5 14.6 92
Med Bow 10500 39.0 -M * 32.8 -M *
Never Summer 10280 19.2 21.4 90 14.8 -M *
North French Creek 10130 29.1 32.9 88 29.3 30.0 98
Old Battle 10000 29.2 34.4 85 30.6 38.4 80
Rawah 9020 7.4 7.8 95 14.7 16.8 88
Sage Creek Basin 7850 8.9 1.7 524 10.7 15.8 68
Sand Lake 10050 30.8 31.2 99 28.0 28.4 99
South Brush Creek 8440 4.3 10.0 43 11.2 17.4 64
Tower 10500 35.0 49.7 70 35.1 43.8 80
Webber Springs 9250 17.6 22.0 80 22.4 29.4 76
Whiskey Park 8950 23.6 25.7 92 26.8 30.8 87
Willow Creek Pass 9540 12.5 13.8 91 11.6 15.3 76
Zirkel 9340 16.1 21.9 74 27.4 30.5 90
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Basin Index (%) 87 84
SWEETWATER
Deer Park 9700 14.2 16.3 87 18.2 22.9 79
Larsen Creek 9000 4.1 9.6 43 10.7 -M *
South Pass 9040 13.6 15.2 89 15.2 19.8 77
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Basin Index (%) 78 78
LOWER N. PLATTE
Casper Mtn. 7900 13.5 14.1 96 13.0 17.5 74
Laprele Creek 8375 9.2 7.1 130 13.5 14.6 92
Reno Hill 8400 16.0 13.6 118 17.9 18.3 98
Windy Peak 7900 11.7 5.5 213 14.2 12.6 113
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Basin Index (%) 125 93
LARAMIE RIVER
Brooklyn Lake 10240 23.7 23.0 103 27.5 24.1 114
Cinnabar Park 9574 18.0 20.1 90 22.5 26.4 85
Crow Creek 8330 3.4 .0 * 11.6 13.0 89
Deadman Hill 10220 20.5 18.5 111 19.1 20.1 95
Rawah 9020 7.4 7.8 95 14.7 16.8 88
Roach 9700 15.1 17.0 89 19.4 21.7 89
Windy Peak 7900 11.7 5.5 213 14.2 12.6 113
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Basin Index (%) 109 96
S. PLATTE
Crow Creek 8330 3.4 .0 * 11.6 13.0 89
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Basin Index (%) * 89
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 1.0 0* 12.3 16.8 73
Divide Peak 8880 13.0 17.9 73 18.5 23.8 78
Elk River 8700 10.2 14.3 71 13.5 22.2 61
Elkhead Divide 8780 11.9 -M * 17.5 -M *
Little Snake River 8915 18.3 23.1 79 29.2 32.0 91
Old Battle 10000 29.2 34.4 85 30.6 38.4 80
Sage Creek Basin 7850 8.9 1.7 524 10.7 15.8 68
Sandstone RS 8150 3.3 7.7 43 14.3 20.3 70
Whiskey Park 8950 23.6 25.7 92 26.8 30.8 87
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Basin Index (%) 85 78
UPPER GREEN RIVER
Big Sandy Opening 9080 11.0 11.8 93 10.5 14.8 71
Blind Bull Sum 8650 20.2 24.1 84 13.9 20.8 67
East Rim Divide 7930 .6 8.8 7 9.4 12.5 75
Elkhart Park G.S. 9400 10.2 11.8 86 10.2 14.6 70
Gros Ventre Summit 8750 9.3 12.1 77 11.4 14.2 80
Gunsight Pass 9820 11.3 13.3 85 12.8 15.5 83
Indian Creek 9425 18.7 23.8 79 19.6 24.4 80
Kendall R.S. 7740 3.1 5.9 53 13.9 15.1 92
Larsen Creek 9000 4.1 9.6 43 10.7 -M *
Loomis Park 8240 8.9 11.5 77 14.8 18.5 80
New Fork Lake 8340 6.1 7.1 86 11.2 11.7 96
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 -M 10.0 * -M 15.2 *
Spring Creek Divide 9000 22.6 24.0 94 23.5 25.6 92
Triple Peak 8500 16.8 18.8 89 23.8 27.3 87
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Basin Index (%) 78 81
LOWER GREEN RIVER
Blacks Fork Jct 8869 4.0 -M * 10.8 -M *
Buck Pasture 9632 10.4 -M * 15.4 -M *
EF Blacks Fork GS 9360 10.0 -M * 11.8 -M *
Hams Fork 7840 3.0 4.4 68 11.6 12.7 91
Henrys Fork 10182 -M -M * 13.0 -M *
Hewinta 9500 7.9 6.1 130 14.0 15.7 89
Hickerson Park 9122 4.6 5.0 92 11.6 11.7 99
Hole-in-Rock 9168 5.9 4.2 140 12.0 11.2 107
Indian Creek 9425 18.7 23.8 79 19.6 24.4 80
Kelley R.S. 8180 10.5 11.8 89 15.3 19.7 78
Spirit Lk 10235 11.9 -M * 15.5 -M *
Steel Creek Park 10158 15.0 16.7 90 17.5 18.6 94
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Basin Index (%) 91 89
UPPER BEAR RIVER
Bear River RS 8777 .4 -M * 11.4 -M *
Bug Lake 7987 11.8 16.1 73 15.6 21.1 74
Burts Miller Ranch 8000 .2 -M * 7.6 -M *
Chalk Creek #1 9171 15.0 24.7 61 18.9 27.8 68
Dry Bread Pond 8302 9.2 15.7 59 15.9 21.4 74
Giveout 6930 .0 .0 * 10.7 13.5 79
Hayden Fork 9130 5.9 10.1 58 19.0 23.2 82
Kelley R.S. 8180 10.5 11.8 89 15.3 19.7 78
Lily Lake 9133 8.8 9.7 91 12.7 19.0 67
Monte Cristo 8932 18.0 27.3 66 20.8 28.5 73
Salt River Summit 7640 8.9 8.2 109 14.1 18.0 78
Spring Creek Divide 9000 22.6 24.0 94 23.5 25.6 92
Trial Lake 9992 17.6 22.7 78 18.4 26.3 70
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Basin Index (%) 75 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.