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 18 , 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 1.0 .0 * 21.8 24.3 90
Black Bear 8170 -M 34.8 * 36.3 44.4 82
Blind Bull Sum 8650 29.4 21.0 140 19.3 23.1 84
Cottonwood Creek 7670 12.1 8.2 148 34.1 29.8 114
East Rim Divide 7930 .1 1.8 6 13.0 14.0 93
Grand Targhee 9260 40.1 43.4 92 35.7 36.7 97
Granite Creek 6770 3.2 .0 * 21.0 22.8 92
Grassy Lake 7265 17.6 19.5 90 37.8 41.7 91
Gros Ventre Summit 8750 6.8 7.0 97 15.8 16.0 99
Gunsight Pass 9820 10.8 11.4 95 16.8 17.6 95
Lewis Lake Divide 7850 16.3 23.8 68 35.3 40.8 87
Phillips Bench 8200 21.0 20.5 102 34.0 32.7 104
Salt River Summit 7640 .0 .0 * 18.1 19.8 91
Snake River Station 6920 .1 .0 * 24.1 26.3 92
Spring Creek Divide 9000 22.2 21.5 103 28.3 27.9 101
Thumb Divide 7980 3.1 2.8 111 19.3 22.6 85
Togwotee Pass 9580 26.2 23.5 111 31.7 29.5 107
Two Ocean Plateau 9240 32.7 28.7 114 30.8 32.6 94
Willow Creek 8080 21.3 18.2 117 43.0 40.6 106
Younts Peak 8350 1.0 12.5 8 18.5 19.3 96
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Basin Index (%) 100 95
MADISON-GALLATIN
Black Bear 8170 -M 34.8 * 36.3 44.4 82
Canyon 7870 6.0 3.5 171 18.3 19.7 93
Madison Plateau 7750 12.4 15.3 81 22.9 31.3 73
West Yellowstone 6700 .0 .0 * -M 17.4 *
Whiskey Creek 6800 5.6 6.9 81 20.0 24.1 83
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Basin Index (%) 93 82
YELLOWSTONE
Beartooth Lake 9360 26.4 22.1 119 26.2 24.0 109
Burnt Mtn 5880 .0 .0 * 17.6 18.9 93
Canyon 7870 6.0 3.5 171 18.3 19.7 93
Cole Creek 7850 18.4 16.7 110 17.7 19.3 92
Evening Star 9200 25.0 24.5 102 35.3 33.1 107
Fisher Creek 9100 35.4 33.3 106 40.3 38.1 106
Northeast Entrance 7350 .0 .0 * 16.3 15.3 107
Parker Peak 9400 -M 20.6 * -M 22.2 *
Sylvan Lake 8420 13.3 15.9 84 28.3 27.3 104
Thumb Divide 7980 3.1 2.8 111 19.3 22.6 85
Two Ocean Plateau 9240 32.7 28.7 114 30.8 32.6 94
White Mill 8700 28.1 23.2 121 26.8 28.7 93
Wolverine 7650 .1 .0 * 15.4 15.4 100
Younts Peak 8350 1.0 12.5 8 18.5 19.3 96
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Basin Index (%) 103 99
WIND RIVER
Burroughs Creek 8750 .2 -M * 15.9 -M *
Castle Creek 8400 .0 -M * 8.8 -M *
Cold Springs 9630 .1 .0 * 10.0 14.3 70
Deer Park 9700 4.1 11.8 35 16.9 25.9 65
Hobbs Park 10100 6.4 14.0 46 15.7 19.1 82
Kirwin 9550 2.7 9.3 29 12.7 15.7 81
Little Warm 9370 3.2 4.2 76 12.5 17.3 72
Owl Creek 8975 .1 .0 * 8.9 9.5 94
South Pass 9040 1.1 8.5 13 14.4 22.3 65
St. Lawrence Alt 8620 .0 .0 * 9.6 13.4 72
Togwotee Pass 9580 26.2 23.5 111 31.7 29.5 107
Townsend Creek 8700 .0 .2 0* 13.5 17.0 79
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Basin Index (%) 61 79
BIGHORN BASIN
Bald Mtn. 9380 22.1 20.0 110 20.0 21.9 91
Bear Trap Meadow 8200 .1 .0 * 12.4 12.5 99
Bone Springs Div 9350 18.3 15.0 122 18.1 20.7 87
Grave Springs 8550 2.1 4.4 48 11.6 14.9 78
Kirwin 9550 2.7 9.3 29 12.7 15.7 81
Marquette 8760 .9 -M * 11.6 -M *
Middle Powder 7760 4.4 7.0 63 13.7 16.2 85
Owl Creek 8975 .1 .0 * 8.9 9.5 94
Powder River Pass 9480 8.8 6.8 129 16.9 17.1 99
Shell Creek 9580 16.1 15.8 102 16.5 18.4 90
Timber Creek 7950 .1 .0 * 8.9 12.0 74
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Basin Index (%) 96 88
SHOSHONE RIVER
Blackwater 9780 23.8 24.8 96 28.1 25.7 109
Evening Star 9200 25.0 24.5 102 35.3 33.1 107
Marquette 8760 .9 -M * 11.6 -M *
Sylvan Lake 8420 13.3 15.9 84 28.3 27.3 104
Sylvan Road 7120 .0 .0 * 19.2 20.1 96
Younts Peak 8350 1.0 12.5 8 18.5 19.3 96
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Basin Index (%) 81 103
POWDER RIVER
Bear Trap Meadow 8200 .1 .0 * 12.4 12.5 99
Cloud Peak Reservoir 9860 12.6 15.5 81 17.3 19.4 89
Grave Springs 8550 2.1 4.4 48 11.6 14.9 78
Hansen Sawmill 8360 .1 .0 * 12.6 12.7 99
Middle Powder 7760 4.4 7.0 63 13.7 16.2 85
Powder River Pass 9480 8.8 6.8 129 16.9 17.1 99
Soldier Park 8720 .1 -M * 12.1 -M *
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Basin Index (%) 83 91
TONGUE RIVER
Big Goose 7990 4.0 6.6 61 12.5 17.1 73
Bone Springs Div 9350 18.3 15.0 122 18.1 20.7 87
Burgess Junction 7880 9.0 9.3 97 14.5 16.8 86
Dome Lake 8880 9.6 7.8 123 13.7 18.9 72
Little Goose 8870 6.9 -M * -M -M *
Sucker Creek 8880 8.6 9.7 89 16.6 20.0 83
Tie Creek 6870 .1 .0 * 15.4 17.2 90
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Basin Index (%) 102 82
BELLE FOURCHE
Blind Park 6890 .0 .0 * 11.2 16.5 68
Cole Canyon 5910 -M .0 * 16.3 14.7 111
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Basin Index (%) * 88
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 11.2 16.5 68
North Rapid Creek 6130 .0 .0 * -M 14.3 *
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Basin Index (%) * 68
UPPER N. PLATTE
Arapaho Ridge 10960 18.7 19.8 94 26.7 28.4 94
Blackhall Mtn 9820 23.5 -M * 35.2 -M *
Columbine 9160 7.0 5.2 135 34.7 30.5 114
Divide Peak 8880 1.4 7.7 18 26.0 26.3 99
Joe Wright 10120 17.8 21.9 81 32.8 32.6 101
Laprele Creek 8375 .0 .0 * 15.3 16.8 91
Med Bow 10500 39.6 -M * 43.2 -M *
Never Summer 10280 17.4 21.3 82 19.7 -M *
North French Creek 10130 31.9 30.8 104 39.2 33.5 117
Old Battle 10000 31.9 33.4 96 36.6 41.9 87
Rawah 9020 .1 .7 14* 18.7 18.9 99
Sage Creek Basin 7850 -M .0 * 15.3 17.2 89
Sand Lake 10050 29.6 28.8 103 33.6 31.7 106
South Brush Creek 8440 .0 .4 0* 17.9 19.9 90
Tower 10500 46.2 48.6 95 50.5 47.6 106
Webber Springs 9250 11.9 13.9 86 31.1 31.9 97
Whiskey Park 8950 18.2 23.2 78 36.8 33.7 109
Willow Creek Pass 9540 8.4 10.2 82 16.4 17.2 95
Zirkel 9340 5.9 13.0 45 36.6 33.3 110
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Basin Index (%) 88 101
SWEETWATER
Deer Park 9700 4.1 11.8 35 16.9 25.9 65
Larsen Creek 9000 .1 4.2 2 11.6 -M *
South Pass 9040 1.1 8.5 13 14.4 22.3 65
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Basin Index (%) 22 65
LOWER N. PLATTE
Casper Mtn. 7900 3.7 6.4 58 14.6 20.3 72
Laprele Creek 8375 .0 .0 * 15.3 16.8 91
Reno Hill 8400 9.2 5.6 164 21.1 21.2 100
Windy Peak 7900 -M .0 * -M 14.7 *
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Basin Index (%) 108 87
LARAMIE RIVER
Brooklyn Lake 10240 19.9 18.0 111 32.9 27.0 122
Cinnabar Park 9574 14.4 13.8 104 31.1 29.5 105
Crow Creek 8330 .0 .0 * 15.6 15.0 104
Deadman Hill 10220 13.8 17.6 78 21.5 22.8 94
Rawah 9020 .1 .7 14* 18.7 18.9 99
Roach 9700 3.5 12.6 28 20.7 24.5 84
Windy Peak 7900 -M .0 * -M 14.7 *
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Basin Index (%) 82 102
S. PLATTE
Black Mountain 8920 .6 -M * 18.0 -M *
Crow Creek 8330 .0 .0 * 15.6 15.0 104
Deadman Hill 10220 13.8 17.6 78 21.5 22.8 94
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Basin Index (%) 78* 98
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 17.5 18.5 95
Divide Peak 8880 1.4 7.7 18 26.0 26.3 99
Elk River 8700 .0 .3 0* 21.2 24.5 87
Little Snake River 8915 11.7 15.5 75 38.4 35.0 110
Old Battle 10000 31.9 33.4 96 36.6 41.9 87
Sage Creek Basin 7850 -M .0 * 15.3 17.2 89
Sandstone RS 8150 .0 .0 * 19.9 22.4 89
Whiskey Park 8950 18.2 23.2 78 36.8 33.7 109
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Basin Index (%) 79 96
UPPER GREEN RIVER
Big Sandy Opening 9080 .1 5.2 2 11.0 16.8 65
Blind Bull Sum 8650 29.4 21.0 140 19.3 23.1 84
East Rim Divide 7930 .1 1.8 6 13.0 14.0 93
Elkhart Park G.S. 9400 2.1 6.9 30 12.7 16.6 77
Gros Ventre Summit 8750 6.8 7.0 97 15.8 16.0 99
Gunsight Pass 9820 10.8 11.4 95 16.8 17.6 95
Indian Creek 9425 12.4 20.0 62 18.8 26.9 70
Kendall R.S. 7740 .0 .0 * 14.2 16.7 85
Loomis Park 8240 3.1 4.0 78 22.6 20.4 111
New Fork Lake 8340 .0 .0 * 11.8 13.5 87
Pocket Creek 9360 -M -M * 10.3 -M *
Snider Basin 8060 .0 1.7 0 15.8 16.7 95
Spring Creek Divide 9000 22.2 21.5 103 28.3 27.9 101
Triple Peak 8500 13.1 10.3 127 31.1 30.1 103
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Basin Index (%) 90 90
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * 14.0 -M *
Buck Pasture 9632 3.7 -M * 20.4 -M *
EF Blacks Fork GS 9360 .0 -M * 15.9 -M *
Hams Fork 7840 .0 .0 * 14.0 14.3 98
Hewinta 9500 .0 .0 * 17.1 17.6 97
Hickerson Park 9122 .0 .0 * 13.3 13.3 100
Hole-in-Rock 9168 .1 .0 * 13.4 12.9 104
Indian Creek 9425 12.4 20.0 62 18.8 26.9 70
Kelley R.S. 8180 .0 4.3 0 18.4 21.6 85
Spirit Lk 10235 6.2 -M * 20.2 -M *
Steel Creek Park 10158 11.6 15.5 75 21.0 20.9 100
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Basin Index (%) 61* 91
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 12.9 -M *
Bug Lake 7987 .1 7.4 1 20.1 23.3 86
Burts Miller Ranch 8000 .0 -M * 8.0 -M *
Chalk Creek #1 9171 4.6 17.2 27 21.6 30.7 70
Hayden Fork 9130 .0 .4 0* 23.1 25.6 90
Kelley R.S. 8180 .0 4.3 0 18.4 21.6 85
Lily Lake 9133 .1 .0 * 14.4 21.2 68
Monte Cristo 8932 11.5 16.7 69 28.3 31.4 90
Salt River Summit 7640 .0 .0 * 18.1 19.8 91
Spring Creek Divide 9000 22.2 21.5 103 28.3 27.9 101
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Basin Index (%) 57 86
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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.
