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: MAY 1 , 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 6.9 9.3 74 18.7 22.8 82
Blind Bull Sum 8650 20.7 23.1 90 14.0 21.3 66
Cottonwood Creek 7670 13.3 15.3 87 24.6 27.5 89
East Rim Divide 7930 .1 8.2 1 9.6 12.9 74
Grand Targhee 9260 35.6 44.8 79 30.7 34.6 89
Granite Creek 6770 6.9 8.3 83 15.9 21.3 75
Grassy Lake 7265 21.0 29.1 72 32.3 39.3 82
Gros Ventre Summit 8750 7.7 11.6 66 11.3 14.6 77
Gunsight Pass 9820 10.6 12.5 85 12.8 16.0 80
Lewis Lake Divide 7850 19.6 30.1 65 30.4 38.5 79
Loomis Park 8240 6.5 11.0 59 14.8 18.9 78
Phillips Bench 8200 17.6 25.4 69 24.4 30.7 79
Salt River Summit 7640 6.0 7.9 76 14.1 18.4 77
Snake River Station 6920 .2 7.4 3 19.9 24.7 81
Somsen Ranch 6800 .5 1.1 45* 14.8 18.3 81
Spring Creek Divide 9000 21.8 24.3 90 23.6 26.2 90
Thumb Divide 7980 3.5 12.4 28 14.8 20.9 71
Togwotee Pass 9580 22.5 24.7 91 26.0 27.2 96
Triple Peak 8500 14.2 17.5 81 23.9 27.9 86
Two Ocean Plateau 9240 25.4 29.7 86 23.2 30.1 77
Willow Creek 8080 16.3 23.0 71 27.6 37.5 74
Younts Peak 8350 9.6 15.5 62 17.1 17.6 97
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Basin Index (%) 73 81
MADISON HEADWATERS IN WYOMING
Black Bear 8170 -M 37.4 * 32.1 41.7 77
Canyon 7870 10.6 10.4 102 14.1 18.0 78
Madison Plateau 7750 16.2 21.3 76 21.4 28.9 74
West Yellowstone 6700 .1 1.8 6 -M 16.0 *
Whiskey Creek 6800 10.6 14.6 73 18.1 22.3 81
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Basin Index (%) 78 77
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 -M 22.8 * 21.4 21.9 98
Canyon 7870 10.6 10.4 102 14.1 18.0 78
Evening Star 9200 24.0 24.9 96 30.7 30.4 101
Fisher Creek 9100 30.3 32.7 93 35.0 35.1 100
Monument Peak 8850 21.0 21.0 100 26.3 24.3 108
Northeast Entrance 7350 -M 3.0 * 15.3 13.8 111
Parker Peak 9400 -M 21.3 * 24.6 20.0 123
Sylvan Lake 8420 10.3 19.8 52 23.2 25.1 92
Thumb Divide 7980 3.5 12.4 28 14.8 20.9 71
Two Ocean Plateau 9240 25.4 29.7 86 23.2 30.1 77
White Mill 8700 24.5 23.8 103 25.4 26.3 97
Wolverine 7650 1.8 2.5 72 17.0 13.7 124
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Basin Index (%) 85 97
WIND RIVER
Burroughs Creek 8750 9.1 -M * 17.0 -M *
Castle Creek 8400 2.3 -M * 10.0 -M *
Cold Springs 9630 6.4 1.3 492 12.4 12.4 100
Deer Park 9700 13.1 16.0 82 18.3 23.4 78
Hobbs Park 10100 13.9 16.0 87 16.6 16.6 100
Kirwin 9550 11.5 10.4 111 13.8 13.8 100
Little Warm 9370 9.1 8.7 105 14.5 15.3 95
South Pass 9040 12.6 14.9 85 15.2 20.3 75
St. Lawrence Alt 8620 1.0 2.5 40 8.7 11.5 76
Togwotee Pass 9580 22.5 24.7 91 26.0 27.2 96
Townsend Creek 8700 10.0 7.5 133 14.4 14.9 97
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Basin Index (%) 98 90
BIGHORN BASIN
Bald Mtn. 9380 20.9 20.5 102 18.6 19.7 94
Bear Trap Meadow 8200 6.5 .9 722 13.0 10.6 123
Bone Springs Div 9350 18.5 16.5 112 15.2 18.2 84
Grave Springs 8550 7.5 9.4 80 10.4 12.8 81
Kirwin 9550 11.5 10.4 111 13.8 13.8 100
Marquette 8760 7.6 -M * 10.4 -M *
Middle Powder 7760 12.4 11.6 107 12.3 14.1 87
Owl Creek 8975 4.9 1.0 490 9.2 7.9 116
Powder River Pass 9480 12.0 9.4 128 13.5 15.1 89
Shell Creek 9580 17.6 15.9 111 14.9 16.3 91
Timber Creek 7950 3.9 3.1 126 9.3 9.9 94
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Basin Index (%) 117 94
SHOSHONE RIVER
Blackwater 9780 19.2 25.3 76 24.0 23.4 103
Evening Star 9200 24.0 24.9 96 30.7 30.4 101
Marquette 8760 7.6 -M * 10.4 -M *
Sylvan Lake 8420 10.3 19.8 52 23.2 25.1 92
Sylvan Road 7120 .0 5.8 0 14.4 18.6 77
Younts Peak 8350 9.6 15.5 62 17.1 17.6 97
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Basin Index (%) 69 95
POWDER RIVER
Bear Trap Meadow 8200 6.5 .9 722 13.0 10.6 123
Cloud Peak Reservoir 9860 18.1 16.5 110 19.6 16.6 118
Grave Springs 8550 7.5 9.4 80 10.4 12.8 81
Hansen Sawmill 8360 9.6 2.5 384 13.3 10.8 123
Middle Powder 7760 12.4 11.6 107 12.3 14.1 87
Powder River Pass 9480 12.0 9.4 128 13.5 15.1 89
Soldier Park 8720 8.1 -M * 13.7 -M *
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Basin Index (%) 131 103
TONGUE RIVER
Big Goose 7990 11.2 9.2 122 15.2 14.0 109
Bone Springs Div 9350 18.5 16.5 112 15.2 18.2 84
Burgess Junction 7880 14.0 12.1 116 17.0 14.8 115
Dome Lake 8880 13.7 11.4 120 17.0 16.4 104
Little Goose 8870 14.5 -M * 18.0 -M *
Sucker Creek 8880 15.9 12.2 130 21.0 17.3 121
Tie Creek 6870 4.7 2.7 174 14.1 14.3 99
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Basin Index (%) 122 105
BELLE FOURCHE
Blind Park 6890 .0 .8 0 11.2 14.3 78
Cole Canyon 5910 .0 .3 0* 9.6 11.8 81
North Rapid Creek 6130 2.1 .8 262 11.5 12.2 94
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Basin Index (%) 111 84
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .8 0 11.2 14.3 78
North Rapid Creek 6130 2.1 .8 262 11.5 12.2 94
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Basin Index (%) 131 86
UPPER N. PLATTE
Arapaho Ridge 10960 20.9 22.3 94 23.4 26.2 89
Blackhall Mtn 9820 26.7 -M * 29.7 -M *
Cinnabar Park 9574 17.0 19.4 88 23.1 26.9 86
Columbine 9160 11.3 18.2 62 22.1 28.5 78
Divide Peak 8880 10.8 18.0 60 19.2 24.3 79
Joe Wright 10120 22.6 23.3 97 26.8 29.8 90
Laprele Creek 8375 7.6 6.1 125 14.1 15.0 94
Med Bow 10500 39.3 -M * 33.2 -M *
Never Summer 10280 19.0 21.8 87 15.1 -M *
North French Creek 10130 27.2 32.9 83 29.7 30.7 97
Old Battle 10000 29.6 34.7 85 31.4 39.2 80
Rawah 9020 5.1 6.1 84 15.4 17.2 90
Sage Creek Basin 7850 5.2 1.1 473* 11.1 16.1 69
Sand Lake 10050 30.3 31.4 96 28.5 29.0 98
South Brush Creek 8440 1.2 9.2 13 11.2 17.8 63
Tower 10500 35.2 50.0 70 36.1 44.7 81
Webber Springs 9250 17.1 21.7 79 23.6 29.9 79
Whiskey Park 8950 21.4 26.5 81 27.1 31.5 86
Willow Creek Pass 9540 12.2 14.2 86 11.9 15.8 75
Zirkel 9340 12.5 21.0 60 27.7 31.0 89
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Basin Index (%) 81 84
SWEETWATER
Deer Park 9700 13.1 16.0 82 18.3 23.4 78
Larsen Creek 9000 1.1 9.2 12 10.6 -M *
South Pass 9040 12.6 14.9 85 15.2 20.3 75
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Basin Index (%) 67 77
LOWER N. PLATTE
Casper Mtn. 7900 12.1 13.3 91 13.2 17.9 74
Laprele Creek 8375 7.6 6.1 125 14.1 15.0 94
Reno Hill 8400 14.6 12.6 116 18.3 18.9 97
Windy Peak 7900 10.1 4.0 252 14.5 13.0 112
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Basin Index (%) 123 93
LARAMIE RIVER
Brooklyn Lake 10240 22.1 23.3 95 28.0 24.7 113
Cinnabar Park 9574 17.0 19.4 88 23.1 26.9 86
Crow Creek 8330 1.0 .0 * 12.2 13.4 91
Deadman Hill 10220 21.4 19.0 113 20.5 20.6 100
Rawah 9020 5.1 6.1 84 15.4 17.2 90
Roach 9700 14.9 17.2 87 20.7 22.2 93
Windy Peak 7900 10.1 4.0 252 14.5 13.0 112
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Basin Index (%) 103 97
S. PLATTE
Crow Creek 8330 1.0 .0 * 12.2 13.4 91
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Basin Index (%) * 91
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 12.1 17.1 71
Divide Peak 8880 10.8 18.0 60 19.2 24.3 79
Elk River 8700 7.2 13.2 55 13.7 22.7 60
Elkhead Divide 8780 9.3 -M * 17.7 -M *
Little Snake River 8915 15.9 22.3 71 29.6 32.7 91
Old Battle 10000 29.6 34.7 85 31.4 39.2 80
Sage Creek Basin 7850 5.2 1.1 473* 11.1 16.1 69
Sandstone RS 8150 .0 5.9 0 14.5 20.8 70
Whiskey Park 8950 21.4 26.5 81 27.1 31.5 86
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Basin Index (%) 74 78
UPPER GREEN RIVER
Big Sandy Opening 9080 9.9 10.6 93 10.5 15.1 70
Blind Bull Sum 8650 20.7 23.1 90 14.0 21.3 66
East Rim Divide 7930 .1 8.2 1 9.6 12.9 74
Elkhart Park G.S. 9400 9.4 11.3 83 10.4 15.0 69
Gros Ventre Summit 8750 7.7 11.6 66 11.3 14.6 77
Gunsight Pass 9820 10.6 12.5 85 12.8 16.0 80
Indian Creek 9425 17.1 23.0 74 19.7 25.0 79
Kendall R.S. 7740 .0 4.3 0 13.8 15.5 89
Larsen Creek 9000 1.1 9.2 12 10.6 -M *
Loomis Park 8240 6.5 11.0 59 14.8 18.9 78
New Fork Lake 8340 3.0 6.5 46 11.1 12.1 92
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 -M 9.4 * -M 15.6 *
Spring Creek Divide 9000 21.8 24.3 90 23.6 26.2 90
Triple Peak 8500 14.2 17.5 81 23.9 27.9 86
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Basin Index (%) 71 80
LOWER GREEN RIVER
Blacks Fork Jct 8869 1.7 -M * 11.1 -M *
Buck Pasture 9632 9.6 -M * 16.1 -M *
EF Blacks Fork GS 9360 8.7 -M * 12.4 -M *
Hams Fork 7840 .0 2.9 0 11.7 13.1 89
Henrys Fork 10182 -M -M * 13.8 -M *
Hewinta 9500 5.6 4.8 117 14.5 16.1 90
Hickerson Park 9122 2.6 4.2 62 12.1 12.0 101
Hole-in-Rock 9168 4.5 2.5 180 12.5 11.4 110
Indian Creek 9425 17.1 23.0 74 19.7 25.0 79
Kelley R.S. 8180 8.1 11.5 70 15.4 20.2 76
Spirit Lk 10235 11.5 -M * 16.4 -M *
Steel Creek Park 10158 16.0 17.1 94 18.3 19.1 96
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Basin Index (%) 82 89
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 11.4 -M *
Bug Lake 7987 9.0 15.1 60 15.6 21.7 72
Burts Miller Ranch 8000 .0 -M * 7.7 -M *
Chalk Creek #1 9171 13.1 24.2 54 19.3 28.4 68
Dry Bread Pond 8302 5.9 14.6 40 15.9 21.8 73
Giveout 6930 .0 .0 * 10.7 13.9 77
Hayden Fork 9130 2.6 9.3 28 19.1 23.8 80
Kelley R.S. 8180 8.1 11.5 70 15.4 20.2 76
Lily Lake 9133 6.6 9.9 67 12.8 19.5 66
Monte Cristo 8932 15.5 26.5 58 20.8 29.2 71
Salt River Summit 7640 6.0 7.9 76 14.1 18.4 77
Spring Creek Divide 9000 21.8 24.3 90 23.6 26.2 90
Trial Lake 9992 15.2 22.8 67 18.6 26.9 69
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Basin Index (%) 62 74
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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.
