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: MAY 4 , 2020
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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 10.8 7.8 138 21.2 23.1 92
Black Bear 8170 35.3 37.3 95 35.2 42.2 83
Blind Bull Sum 8650 28.4 22.8 125 18.3 21.6 85
Cottonwood Creek 7670 21.3 14.4 148 33.3 27.8 120
East Rim Divide 7930 1.2 7.7 16 11.8 13.1 90
Grand Targhee 9260 40.6 45.7 89 34.5 35.2 98
Granite Creek 6770 12.8 7.6 168 -M 21.6 *
Grassy Lake 7265 27.0 27.9 97 36.7 39.7 92
Gros Ventre Summit 8750 12.7 11.1 114 15.2 14.9 102
Gunsight Pass 9820 14.3 12.0 119 16.1 16.3 99
Lewis Lake Divide 7850 23.5 29.6 79 34.3 39.0 88
Phillips Bench 8200 27.9 24.5 114 33.3 31.0 107
Salt River Summit 7640 6.7 7.4 91 17.8 18.6 96
Snake River Station 6920 9.9 5.6 177 23.5 25.0 94
Spring Creek Divide 9000 26.4 24.3 109 27.6 26.5 104
Thumb Divide 7980 11.1 10.8 103 18.7 21.3 88
Togwotee Pass 9580 28.6 24.7 116 30.5 27.7 110
Two Ocean Plateau 9240 32.6 29.9 109 29.0 30.5 95
Willow Creek 8080 32.6 22.0 148 41.3 38.1 108
Younts Peak 8350 11.3 15.8 72 16.8 18.0 93
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Basin Index (%) 107 97
MADISON-GALLATIN
Black Bear 8170 35.3 37.3 95 35.2 42.2 83
Canyon 7870 11.4 9.1 125 17.3 18.2 95
Madison Plateau 7750 18.4 20.9 88 22.0 29.2 75
West Yellowstone 6700 .0 .2 0* 10.4 16.2 64
Whiskey Creek 6800 11.9 13.3 89 19.7 22.6 87
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Basin Index (%) 95 81
YELLOWSTONE
Beartooth Lake 9360 25.2 22.7 111 24.6 22.2 111
Burnt Mtn 5880 .0 .0 * 16.8 16.2 104
Canyon 7870 11.4 9.1 125 17.3 18.2 95
Cole Creek 7850 17.8 16.7 107 16.0 16.7 96
Evening Star 9200 25.7 24.9 103 33.7 30.8 109
Fisher Creek 9100 34.0 32.7 104 37.4 35.5 105
Northeast Entrance 7350 2.7 1.6 169 14.7 14.0 105
Parker Peak 9400 28.9 21.2 136 26.6 20.3 131
Sylvan Lake 8420 18.6 19.0 98 27.1 25.4 107
Thumb Divide 7980 11.1 10.8 103 18.7 21.3 88
Two Ocean Plateau 9240 32.6 29.9 109 29.0 30.5 95
White Mill 8700 29.5 24.0 123 24.9 26.6 94
Wolverine 7650 3.4 1.1 309 14.9 14.0 106
Younts Peak 8350 11.3 15.8 72 16.8 18.0 93
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Basin Index (%) 110 103
WIND RIVER
Burroughs Creek 8750 8.0 -M * 15.5 -M *
Castle Creek 8400 .0 -M * 8.3 -M *
Cold Springs 9630 .6 1.4 43 9.3 12.7 73
Deer Park 9700 10.9 15.4 71 16.2 23.8 68
Hobbs Park 10100 12.8 16.0 80 14.6 17.0 86
Kirwin 9550 10.3 10.6 97 12.5 14.1 89
Little Warm 9370 10.6 8.1 131 11.9 15.6 76
Owl Creek 8975 .0 .6 0 8.7 8.1 107
South Pass 9040 9.1 14.1 65 13.5 20.7 65
St. Lawrence Alt 8620 .0 2.0 0 9.3 11.8 79
Togwotee Pass 9580 28.6 24.7 116 30.5 27.7 110
Townsend Creek 8700 7.3 6.6 111 12.6 15.2 83
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Basin Index (%) 91 83
BIGHORN BASIN
Bald Mtn. 9380 21.4 20.4 105 18.3 20.0 92
Bear Trap Meadow 8200 .1 .4 25* 10.8 10.9 99
Bone Springs Div 9350 18.4 16.4 112 16.6 18.6 89
Grave Springs 8550 6.3 9.3 68 11.0 13.1 84
Kirwin 9550 10.3 10.6 97 12.5 14.1 89
Marquette 8760 5.7 -M * 11.0 -M *
Middle Powder 7760 9.0 11.4 79 12.9 14.4 90
Owl Creek 8975 .0 .6 0 8.7 8.1 107
Powder River Pass 9480 9.8 9.1 108 15.0 15.4 97
Shell Creek 9580 15.9 16.0 99 15.7 16.6 95
Timber Creek 7950 .4 2.5 16 8.5 10.2 83
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Basin Index (%) 95 92
SHOSHONE RIVER
Blackwater 9780 25.1 25.8 97 26.7 23.8 112
Evening Star 9200 25.7 24.9 103 33.7 30.8 109
Marquette 8760 5.7 -M * 11.0 -M *
Sylvan Lake 8420 18.6 19.0 98 27.1 25.4 107
Sylvan Road 7120 .0 4.1 0 18.6 18.8 99
Younts Peak 8350 11.3 15.8 72 16.8 18.0 93
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Basin Index (%) 90 105
POWDER RIVER
Bear Trap Meadow 8200 .1 .4 25* 10.8 10.9 99
Cloud Peak Reservoir 9860 13.5 16.3 83 15.7 17.0 92
Grave Springs 8550 6.3 9.3 68 11.0 13.1 84
Hansen Sawmill 8360 2.3 1.7 135 10.8 11.1 97
Middle Powder 7760 9.0 11.4 79 12.9 14.4 90
Powder River Pass 9480 9.8 9.1 108 15.0 15.4 97
Soldier Park 8720 1.3 -M * 10.6 -M *
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Basin Index (%) 85 93
TONGUE RIVER
Big Goose 7990 6.7 9.4 71 11.3 14.4 78
Bone Springs Div 9350 18.4 16.4 112 16.6 18.6 89
Burgess Junction 7880 10.7 11.8 91 13.7 15.1 91
Dome Lake 8880 11.6 11.3 103 12.0 16.7 72
Little Goose 8870 8.7 -M * 10.5 -M *
Sucker Creek 8880 10.7 11.9 90 15.2 17.7 86
Tie Creek 6870 .8 2.5 32 14.2 14.7 97
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Basin Index (%) 93 85
BELLE FOURCHE
Blind Park 6890 .0 .2 0* 10.1 14.6 69
Cole Canyon 5910 .0 .0 * 14.3 12.4 115
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Basin Index (%) 0* 90
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .2 0* 10.1 14.6 69
North Rapid Creek 6130 .0 .0 * 9.7 12.6 77
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Basin Index (%) 0* 73
UPPER N. PLATTE
Arapaho Ridge 10960 22.6 22.3 101 25.6 26.5 97
Blackhall Mtn 9820 29.4 -M * 33.8 -M *
Columbine 9160 19.9 17.1 116 33.4 28.9 116
Divide Peak 8880 13.5 17.5 77 24.8 24.8 100
Joe Wright 10120 23.0 22.9 100 31.1 30.4 102
Laprele Creek 8375 5.6 5.4 104 14.6 15.3 95
Med Bow 10500 42.9 -M * 41.1 -M *
Never Summer 10280 21.9 21.8 100 18.5 -M *
North French Creek 10130 34.8 32.7 106 36.9 31.2 118
Old Battle 10000 34.3 34.8 99 34.6 39.7 87
Rawah 9020 6.2 4.8 129 17.0 17.6 97
Sage Creek Basin 7850 1.4 .8 175* 14.5 16.4 88
Sand Lake 10050 33.3 31.6 105 32.1 29.5 109
South Brush Creek 8440 4.2 7.9 53 15.8 18.2 87
Tower 10500 47.2 50.7 93 48.4 45.3 107
Webber Springs 9250 18.5 21.1 88 29.7 30.3 98
Whiskey Park 8950 25.8 26.9 96 35.2 32.0 110
Willow Creek Pass 9540 13.7 14.5 94 15.7 16.0 98
Zirkel 9340 17.9 20.7 86 35.4 31.3 113
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Basin Index (%) 97 103
SWEETWATER
Deer Park 9700 10.9 15.4 71 16.2 23.8 68
Larsen Creek 9000 .0 8.3 0 11.0 -M *
South Pass 9040 9.1 14.1 65 13.5 20.7 65
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Basin Index (%) 53 67
LOWER N. PLATTE
Casper Mtn. 7900 11.3 12.5 90 13.7 18.4 74
Laprele Creek 8375 5.6 5.4 104 14.6 15.3 95
Reno Hill 8400 15.0 12.1 124 20.1 19.3 104
Windy Peak 7900 2.4 3.1 77 11.3 13.2 86
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Basin Index (%) 104 90
LARAMIE RIVER
Brooklyn Lake 10240 27.0 23.0 117 31.2 25.1 124
Cinnabar Park 9574 20.6 18.8 110 29.8 27.3 109
Crow Creek 8330 .0 .0 * 14.4 13.7 105
Deadman Hill 10220 18.2 19.1 95 19.9 21.0 95
Rawah 9020 6.2 4.8 129 17.0 17.6 97
Roach 9700 11.8 17.1 69 19.2 22.6 85
Windy Peak 7900 2.4 3.1 77 11.3 13.2 86
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Basin Index (%) 100 102
S. PLATTE
Black Mountain 8920 6.2 -M * 16.8 -M *
Crow Creek 8330 .0 .0 * 14.4 13.7 105
Deadman Hill 10220 18.2 19.1 95 19.9 21.0 95
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Basin Index (%) 95* 99
LITTLE SNAKE RIVER
Battle Mountain 7440 .1 .0 * 16.3 17.4 94
Divide Peak 8880 13.5 17.5 77 24.8 24.8 100
Elk River 8700 9.9 12.0 82 20.1 23.1 87
Little Snake River 8915 21.0 21.7 97 36.9 33.2 111
Old Battle 10000 34.3 34.8 99 34.6 39.7 87
Sage Creek Basin 7850 1.4 .8 175* 14.5 16.4 88
Sandstone RS 8150 5.7 4.6 124 18.4 21.0 88
Whiskey Park 8950 25.8 26.9 96 35.2 32.0 110
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Basin Index (%) 94 97
UPPER GREEN RIVER
Big Sandy Opening 9080 6.8 9.4 72 10.5 15.5 68
Blind Bull Sum 8650 28.4 22.8 125 18.3 21.6 85
East Rim Divide 7930 1.2 7.7 16 11.8 13.1 90
Elkhart Park G.S. 9400 8.3 10.6 78 12.0 15.2 79
Gros Ventre Summit 8750 12.7 11.1 114 15.2 14.9 102
Gunsight Pass 9820 14.3 12.0 119 16.1 16.3 99
Indian Creek 9425 19.3 22.1 87 18.3 25.3 72
Kendall R.S. 7740 4.6 2.6 177 13.8 15.7 88
Loomis Park 8240 10.6 10.0 106 21.4 19.2 111
New Fork Lake 8340 4.6 5.5 84 -M 12.3 *
Pocket Creek 9360 -M -M * 9.9 -M *
Snider Basin 8060 2.3 8.5 27 15.4 15.8 97
Spring Creek Divide 9000 26.4 24.3 109 27.6 26.5 104
Triple Peak 8500 22.0 16.3 135 30.4 28.2 108
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Basin Index (%) 99 93
LOWER GREEN RIVER
Blacks Fork Jct 8869 1.2 -M * 14.0 -M *
Buck Pasture 9632 12.5 -M * 20.1 -M *
EF Blacks Fork GS 9360 7.6 -M * 14.4 -M *
Hams Fork 7840 .0 1.5 0 13.3 13.3 100
Hewinta 9500 4.4 4.2 105 16.9 16.5 102
Hickerson Park 9122 2.4 3.2 75 13.2 12.2 108
Hole-in-Rock 9168 2.1 1.7 124 13.3 11.8 113
Indian Creek 9425 19.3 22.1 87 18.3 25.3 72
Kelley R.S. 8180 8.6 10.4 83 18.0 20.5 88
Spirit Lk 10235 13.4 -M * 19.8 -M *
Steel Creek Park 10158 16.4 17.4 94 20.8 19.5 107
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Basin Index (%) 88 96
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 12.9 -M *
Bug Lake 7987 11.6 13.8 84 19.9 22.0 90
Burts Miller Ranch 8000 .0 -M * 7.9 -M *
Chalk Creek #1 9171 14.5 23.4 62 21.3 28.9 74
Hayden Fork 9130 6.1 8.6 71 23.1 24.1 96
Kelley R.S. 8180 8.6 10.4 83 18.0 20.5 88
Lily Lake 9133 5.9 9.7 61 14.7 19.9 74
Monte Cristo 8932 21.3 25.3 84 28.0 29.7 94
Salt River Summit 7640 6.7 7.4 91 17.8 18.6 96
Spring Creek Divide 9000 26.4 24.3 109 27.6 26.5 104
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Basin Index (%) 82 90
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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.