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 THURSDAY: MAY 31 , 2018
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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 .0 .0 * 28.2 25.6 110
Black Bear 8170 32.3 25.7 126 50.5 46.2 109
Blind Bull Sum 8650 -M 12.3 * 26.8 24.3 110
Cottonwood Creek 7670 .0 .0 * 34.4 31.3 110
East Rim Divide 7930 .1 .0 * 17.1 15.0 114
Grand Targhee 9260 37.3 40.3 93 44.5 38.6 115
Granite Creek 6770 .1 .0 * 28.7 24.0 120
Grassy Lake 7265 .4 5.9 7 44.2 43.6 101
Gros Ventre Summit 8750 -M .0 * 20.8 17.0 122
Gunsight Pass 9820 6.4 3.4 188 23.3 18.6 125
Lewis Lake Divide 7850 13.7 12.6 109 48.2 42.6 113
Phillips Bench 8200 9.2 10.5 88 37.1 34.1 109
Salt River Summit 7640 .0 .0 * 16.3 20.8 78
Snake River Station 6920 .0 .0 * 30.0 27.7 108
Spring Creek Divide 9000 11.9 12.3 97 30.5 29.1 105
Thumb Divide 7980 .0 .0 * 24.3 23.8 102
Togwotee Pass 9580 23.0 19.4 119 41.9 30.9 136
Two Ocean Plateau 9240 27.2 25.5 107 37.8 34.3 110
Willow Creek 8080 .7 4.6 15 45.9 42.5 108
Younts Peak 8350 -M 4.1 * -M 20.6 *
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Basin Index (%) 101 111
MADISON-GALLATIN
Black Bear 8170 32.3 25.7 126 50.5 46.2 109
Canyon 7870 .0 .0 * 24.2 20.9 116
Madison Plateau 7750 8.9 7.1 125 36.1 33.0 109
West Yellowstone 6700 .0 .0 * 22.7 18.5 123
Whiskey Creek 6800 .0 .0 * 26.8 25.6 105
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Basin Index (%) 126* 111
YELLOWSTONE
Beartooth Lake 9360 36.2 17.8 203 41.4 25.1 165
Burnt Mtn 5880 .0 .0 * 23.0 20.7 111
Canyon 7870 .0 .0 * 24.2 20.9 116
Cole Creek 7850 1.5 10.0 15 22.2 21.2 105
Evening Star 9200 28.3 18.5 153 52.4 34.8 151
Fisher Creek 9100 41.3 28.5 145 54.5 39.9 137
Northeast Entrance 7350 .1 .0 * 22.8 16.6 137
Parker Peak 9400 17.9 14.5 123 36.5 23.7 154
Sylvan Lake 8420 1.1 7.6 14 35.3 29.2 121
Thumb Divide 7980 .0 .0 * 24.3 23.8 102
Two Ocean Plateau 9240 27.2 25.5 107 37.8 34.3 110
White Mill 8700 26.5 17.6 151 37.5 30.3 124
Wolverine 7650 .0 .0 * 25.8 16.4 157
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Basin Index (%) 129 130
WIND RIVER
Burroughs Creek 8750 .0 -M * 25.6 -M *
Castle Creek 8400 .0 -M * 15.8 -M *
Cold Springs 9630 .0 .0 * 15.5 15.3 101
Deer Park 9700 .2 3.9 5 22.5 27.0 83
Hobbs Park 10100 4.7 6.7 70 22.0 20.4 108
Kirwin 9550 2.4 2.2 109 24.9 16.9 147
Little Warm 9370 .0 .0 * 22.5 18.4 122
Owl Creek 8975 -M .0 * 12.9 10.7 121
South Pass 9040 .1 .4 25* 14.7 23.5 63
St. Lawrence Alt 8620 .0 .0 * 13.8 14.4 96
Togwotee Pass 9580 23.0 19.4 119 41.9 30.9 136
Townsend Creek 8700 .0 .0 * 15.6 18.1 86
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Basin Index (%) 93* 105
BIGHORN BASIN
Bald Mtn. 9380 7.5 14.2 53 23.5 23.4 100
Bear Trap Meadow 8200 .0 .0 * 14.8 13.8 107
Bone Springs Div 9350 1.5 9.3 16 22.6 22.1 102
Grave Springs 8550 .0 .0 * 10.8 16.1 67
Kirwin 9550 2.4 2.2 109 24.9 16.9 147
Marquette 8760 .0 -M * 18.4 -M *
Middle Powder 7760 .0 .0 * 10.9 17.3 63
Owl Creek 8975 -M .0 * 12.9 10.7 121
Powder River Pass 9480 .0 .0 * 21.0 18.6 113
Shell Creek 9580 8.1 9.7 84 22.1 19.8 112
Timber Creek 7950 .0 .0 * 8.2 13.5 61
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Basin Index (%) 55* 100
SHOSHONE RIVER
Blackwater 9780 27.1 20.2 134 38.8 27.3 142
Evening Star 9200 28.3 18.5 153 52.4 34.8 151
Marquette 8760 .0 -M * 18.4 -M *
Sylvan Road 7120 .1 .0 * 27.4 21.3 129
Younts Peak 8350 -M 4.1 * -M 20.6 *
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Basin Index (%) 143* 142
POWDER RIVER
Bear Trap Meadow 8200 .0 .0 * 14.8 13.8 107
Cloud Peak Reservoir 9860 .7 6.2 11 23.5 21.1 111
Grave Springs 8550 .0 .0 * 10.8 16.1 67
Hansen Sawmill 8360 .0 .0 * 17.3 14.1 123
Middle Powder 7760 .0 .0 * 10.9 17.3 63
Powder River Pass 9480 .0 .0 * 21.0 18.6 113
Soldier Park 8720 .0 -M * 16.9 -M *
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Basin Index (%) 11* 97
TONGUE RIVER
Big Goose 7990 .0 .0 * 15.3 18.1 85
Bone Springs Div 9350 1.5 9.3 16 22.6 22.1 102
Burgess Junction 7880 .0 .1 0* 17.9 18.0 99
Dome Lake 8880 .0 .0 * 21.2 20.2 105
Little Goose 8870 .0 -M * 19.2 -M *
Sucker Creek 8880 .0 .6 0* 18.7 21.4 87
Tie Creek 6870 .1 .0 * 16.4 18.6 88
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Basin Index (%) 16* 95
BELLE FOURCHE
Cole Canyon 5910 .0 .0 * 15.8 16.5 96
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Basin Index (%) * 96
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 16.8 18.2 92
North Rapid Creek 6130 -M .0 * 15.0 15.8 95
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Basin Index (%) * 94
UPPER N. PLATTE
Arapaho Ridge 10960 4.1 8.5 48 25.9 29.1 89
Blackhall Mtn 9820 .1 -M * 31.5 -M *
Columbine 9160 -M .0 * 30.1 31.4 96
Divide Peak 8880 .0 .0 * 21.9 27.3 80
Joe Wright 10120 6.2 14.5 43 36.0 34.2 105
Laprele Creek 8375 .1 .0 * 13.0 17.9 73
Med Bow 10500 21.7 -M * 40.7 -M *
North French Creek 10130 10.8 21.2 51 33.9 35.0 97
Never Summer 10280 11.0 15.9 69 21.5 -M *
Old Battle 10000 10.0 24.8 40 28.1 43.4 65
Rawah 9020 .2 .0 * 19.0 19.5 97
Sage Creek Basin 7850 -M .0 * 12.5 17.8 70
Sand Lake 10050 14.7 20.9 70 28.8 33.0 87
South Brush Creek 8440 .0 .0 * 15.3 21.0 73
Tower 10500 18.9 37.4 51 43.1 49.1 88
Webber Springs 9250 .0 .0 * 24.9 33.0 75
Willow Creek Pass 9540 .1 .0 * 17.5 18.4 95
Zirkel 9340 .0 .0 * 36.1 33.9 106
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Basin Index (%) 53* 87
SWEETWATER
Deer Park 9700 .2 3.9 5 22.5 27.0 83
Larsen Creek 9000 .0 .3 0* 16.5 -M *
South Pass 9040 .1 .4 25* 14.7 23.5 63
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Basin Index (%) 7* 74
LOWER N. PLATTE
Casper Mtn. 7900 .0 .0 * 12.4 21.6 57
Laprele Creek 8375 .1 .0 * 13.0 17.9 73
Reno Hill 8400 .0 .0 * 18.1 22.6 80
Windy Peak 7900 .0 .0 * 14.7 16.0 92
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Basin Index (%) * 75
LARAMIE RIVER
Brooklyn Lake 10240 .0 5.9 0 30.8 28.3 109
Cinnabar Park 9574 -M 1.9 * 28.6 30.2 95
Crow Creek 8330 .0 .0 * 15.8 16.1 98
Deadman Hill 10220 .2 8.7 2 24.3 24.0 101
Rawah 9020 .2 .0 * 19.0 19.5 97
Roach 9700 .0 2.4 0 21.5 25.6 84
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Basin Index (%) 2 97
S. PLATTE
Black Mountain 8920 -M -M * 17.3 -M *
Crow Creek 8330 .0 .0 * 15.8 16.1 98
Deadman Hill 10220 .2 8.7 2 24.3 24.0 101
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Basin Index (%) 2* 100
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 13.8 19.2 72
Divide Peak 8880 .0 .0 * 21.9 27.3 80
Elk River 8700 .0 .0 * 19.7 25.4 78
Little Snake River 8915 .0 2.5 0* 32.0 36.1 89
Old Battle 10000 10.0 24.8 40 28.1 43.4 65
Sage Creek Basin 7850 -M .0 * 12.5 17.8 70
Sandstone RS 8150 -M .0 * 12.0 23.2 52
Whiskey Park 8950 .1 7.5 1 29.8 34.8 86
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Basin Index (%) 29* 75
UPPER GREEN RIVER
Big Sandy Opening 9080 -M .0 * 18.0 17.8 101
Blind Bull Sum 8650 -M 12.3 * 26.8 24.3 110
East Rim Divide 7930 .1 .0 * 17.1 15.0 114
Elkhart Park G.S. 9400 .0 .2 0* 16.9 17.8 95
Gros Ventre Summit 8750 -M .0 * 20.8 17.0 122
Gunsight Pass 9820 6.4 3.4 188 23.3 18.6 125
Kendall R.S. 7740 .0 .0 * 20.6 17.6 117
Loomis Park 8240 .2 .0 * 23.7 21.4 111
New Fork Lake 8340 .0 .0 * 16.7 14.5 115
Pocket Creek 9360 -M -M * 12.5 -M *
Snider Basin 8060 .0 .0 * 18.4 17.5 105
Spring Creek Divide 9000 11.9 12.3 97 30.5 29.1 105
Triple Peak 8500 1.9 .0 * 38.8 31.4 124
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Basin Index (%) 129* 112
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * 12.5 -M *
Buck Pasture 9632 .0 -M * 18.9 -M *
EF Blacks Fork GS 9360 .0 -M * 13.6 -M *
Hams Fork 7840 .0 .0 * 14.6 15.2 96
Hewinta 9500 .0 .0 * 15.5 18.5 84
Hickerson Park 9122 .3 .0 * 13.1 14.3 92
Hole-in-Rock 9168 .0 .0 * 13.6 13.9 98
Indian Creek 9425 2.9 11.2 26 21.5 28.0 77
Kelley R.S. 8180 .0 .0 * 19.4 22.7 85
Spirit Lk 10235 .6 -M * 16.6 -M *
Steel Creek Park 10158 .0 9.7 0 19.6 22.0 89
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Basin Index (%) 15* 87
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 14.0 -M *
Bug Lake 7987 .1 .0 * 20.5 24.4 84
Burts Miller Ranch 8000 .3 -M * 8.1 -M *
Chalk Creek #1 9171 .0 6.7 0 20.1 31.9 63
Hayden Fork 9130 .1 .0 * 20.9 26.7 78
Kelley R.S. 8180 .0 .0 * 19.4 22.7 85
Lily Lake 9133 .0 .0 * 15.2 22.3 68
Monte Cristo 8932 .4 4.9 8 27.1 32.7 83
Salt River Summit 7640 .0 .0 * 16.3 20.8 78
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Basin Index (%) 5* 77
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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.
