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 20 , 2019
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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 .7 .0 * 25.5 24.5 104
Black Bear 8170 39.0 33.8 115 51.2 44.6 115
Blind Bull Sum 8650 24.1 19.9 121 22.9 23.2 99
Cottonwood Creek 7670 9.8 6.3 156 32.1 30.0 107
East Rim Divide 7930 .0 .5 0* 15.4 14.1 109
Grand Targhee 9260 43.5 42.3 103 39.7 36.8 108
Granite Creek 6770 1.1 .0 * 24.7 22.9 108
Grassy Lake 7265 -M 17.4 * -M 41.8 *
Gros Ventre Summit 8750 .5 5.6 9 15.7 16.1 98
Gunsight Pass 9820 12.6 10.4 121 20.0 17.7 113
Lewis Lake Divide 7850 22.8 22.4 102 44.5 41.0 109
Phillips Bench 8200 19.5 19.2 102 37.5 32.8 114
Salt River Summit 7640 .2 .0 * 20.7 19.9 104
Snake River Station 6920 .0 .0 * 29.4 26.5 111
Spring Creek Divide 9000 20.8 20.3 102 28.7 28.0 102
Thumb Divide 7980 5.0 1.4 357* 23.2 22.8 102
Togwotee Pass 9580 23.4 23.0 102 30.1 29.7 101
Two Ocean Plateau 9240 28.1 28.3 99 30.7 32.8 94
Willow Creek 8080 19.0 16.6 114 43.0 40.8 105
Younts Peak 8350 -M 11.8 * -M 19.5 *
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Basin Index (%) 108 106
MADISON-GALLATIN
Black Bear 8170 39.0 33.8 115 51.2 44.6 115
Canyon 7870 4.4 2.2 200 19.8 19.9 99
Madison Plateau 7750 20.4 14.3 143 33.6 31.5 107
West Yellowstone 6700 .0 .0 * 21.0 17.5 120
Whiskey Creek 6800 8.9 5.6 159 25.4 24.3 105
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Basin Index (%) 130 110
YELLOWSTONE
Beartooth Lake 9360 24.1 21.6 112 25.5 24.1 106
Burnt Mtn 5880 .2 .0 * 21.7 19.1 114
Canyon 7870 4.4 2.2 200 19.8 19.9 99
Cole Creek 7850 18.5 16.2 114 -M 19.5 *
Evening Star 9200 26.2 23.7 111 36.1 33.3 108
Fisher Creek 9100 34.3 32.8 105 42.8 38.3 112
Northeast Entrance 7350 .1 .0 * 18.3 15.5 118
Parker Peak 9400 24.0 19.8 121 29.9 22.4 133
Sylvan Lake 8420 14.1 15.1 93 32.8 27.6 119
Thumb Divide 7980 5.0 1.4 357* 23.2 22.8 102
Two Ocean Plateau 9240 28.1 28.3 99 30.7 32.8 94
White Mill 8700 23.7 22.3 106 25.8 28.9 89
Wolverine 7650 .0 .0 * 16.7 15.5 108
Younts Peak 8350 -M 11.8 * -M 19.5 *
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Basin Index (%) 111 108
WIND RIVER
Burroughs Creek 8750 1.6 -M * 17.3 -M *
Castle Creek 8400 .0 -M * 9.8 -M *
Cold Springs 9630 .1 .0 * 12.3 14.4 85
Deer Park 9700 13.0 10.5 124 23.9 25.9 92
Hobbs Park 10100 16.8 13.1 128 18.5 19.3 96
Kirwin 9550 6.1 8.4 73 15.1 15.9 95
Little Warm 9370 2.3 2.7 85 10.9 17.4 63
Owl Creek 8975 .5 .0 * 10.8 9.6 112
South Pass 9040 9.4 6.8 138 17.3 22.5 77
St. Lawrence Alt 8620 -M .0 * -M 13.5 *
Togwotee Pass 9580 23.4 23.0 102 30.1 29.7 101
Townsend Creek 8700 6.2 .0 * 17.4 17.1 102
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Basin Index (%) 121 91
BIGHORN BASIN
Bald Mtn. 9380 18.6 19.2 97 18.1 22.1 82
Bear Trap Meadow 8200 .2 .0 * 10.0 12.6 79
Bone Springs Div 9350 14.1 14.3 99 16.6 20.8 80
Grave Springs 8550 2.7 2.6 104 12.2 15.0 81
Kirwin 9550 6.1 8.4 73 15.1 15.9 95
Marquette 8760 5.1 -M * 15.8 -M *
Middle Powder 7760 .6 5.3 11 14.0 16.3 86
Owl Creek 8975 .5 .0 * 10.8 9.6 112
Powder River Pass 9480 2.7 5.4 50 -M 17.3 *
Shell Creek 9580 14.7 15.3 96 14.9 18.5 81
Timber Creek 7950 .2 .0 * 11.4 12.2 93
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Basin Index (%) 86 86
SHOSHONE RIVER
Blackwater 9780 27.2 24.3 112 31.4 26.0 121
Evening Star 9200 26.2 23.7 111 36.1 33.3 108
Marquette 8760 5.1 -M * 15.8 -M *
Sylvan Lake 8420 14.1 15.1 93 32.8 27.6 119
Sylvan Road 7120 .1 .0 * 19.2 20.3 95
Younts Peak 8350 -M 11.8 * -M 19.5 *
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Basin Index (%) 107 111
POWDER RIVER
Bear Trap Meadow 8200 .2 .0 * 10.0 12.6 79
Cloud Peak Reservoir 9860 11.9 14.8 80 15.7 19.6 80
Grave Springs 8550 2.7 2.6 104 12.2 15.0 81
Hansen Sawmill 8360 .5 .0 * 11.9 12.9 92
Middle Powder 7760 .6 5.3 11 14.0 16.3 86
Powder River Pass 9480 2.7 5.4 50 -M 17.3 *
Soldier Park 8720 .1 -M * 10.5 -M *
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Basin Index (%) 66 84
TONGUE RIVER
Big Goose 7990 6.1 4.8 127 16.1 17.1 94
Bone Springs Div 9350 14.1 14.3 99 16.6 20.8 80
Burgess Junction 7880 5.7 8.1 70 12.9 17.0 76
Dome Lake 8880 6.2 6.2 100 14.9 19.0 78
Little Goose 8870 8.6 -M * 12.2 -M *
Sucker Creek 8880 9.1 8.6 106 16.0 20.2 79
Tie Creek 6870 .2 .0 * 16.7 17.3 97
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Basin Index (%) 99 84
BELLE FOURCHE
Blind Park 6890 .0 .0 * 10.6 16.6 64
Cole Canyon 5910 .0 .0 * 18.1 14.9 121
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Basin Index (%) * 91
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 10.6 16.6 64
North Rapid Creek 6130 -M .0 * -M 14.5 *
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Basin Index (%) * 64
UPPER N. PLATTE
Arapaho Ridge 10960 23.8 18.1 131 31.6 28.5 111
Blackhall Mtn 9820 28.7 -M * 39.4 -M *
Columbine 9160 8.0 3.0 267 33.5 30.6 109
Divide Peak 8880 5.6 5.7 98 28.3 26.5 107
Joe Wright 10120 20.9 21.1 99 35.9 32.8 109
Laprele Creek 8375 .1 .0 * 17.8 16.9 105
Med Bow 10500 40.2 -M * 42.3 -M *
Never Summer 10280 23.7 20.3 117 23.8 -M *
North French Creek 10130 28.8 29.6 97 36.2 33.7 107
Old Battle 10000 38.5 32.5 118 43.1 42.1 102
Rawah 9020 .3 .4 75* 20.7 18.9 110
Sage Creek Basin 7850 -M .0 * 19.6 17.4 113
Sand Lake 10050 30.3 27.8 109 30.3 31.9 95
South Brush Creek 8440 .0 .0 * 15.8 20.1 79
Tower 10500 55.4 47.7 116 54.0 47.9 113
Webber Springs 9250 16.8 12.0 140 36.9 32.1 115
Whiskey Park 8950 25.4 21.9 116 38.6 33.9 114
Willow Creek Pass 9540 13.8 9.3 148 21.1 17.3 122
Zirkel 9340 17.2 9.7 177 43.8 33.4 131
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Basin Index (%) 119 109
SWEETWATER
Deer Park 9700 13.0 10.5 124 23.9 25.9 92
Larsen Creek 9000 .0 3.6 0 17.2 -M *
South Pass 9040 9.4 6.8 138 17.3 22.5 77
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Basin Index (%) 107 85
LOWER N. PLATTE
Casper Mtn. 7900 5.0 4.5 111 17.3 20.4 85
Laprele Creek 8375 .1 .0 * 17.8 16.9 105
Reno Hill 8400 9.6 3.6 267 22.9 21.3 108
Windy Peak 7900 .3 .0 * 14.1 14.9 95
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Basin Index (%) 185 98
LARAMIE RIVER
Brooklyn Lake 10240 18.2 16.4 111 31.6 27.2 116
Cinnabar Park 9574 14.0 12.3 114 28.8 29.5 98
Crow Creek 8330 .1 .0 * 14.2 15.1 94
Deadman Hill 10220 17.4 16.5 105 24.4 23.0 106
Rawah 9020 .3 .4 75* 20.7 18.9 110
Roach 9700 9.7 11.5 84 27.0 24.7 109
Windy Peak 7900 .3 .0 * 14.1 14.9 95
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Basin Index (%) 105 105
S. PLATTE
Black Mountain 8920 .4 -M * 18.1 -M *
Crow Creek 8330 .1 .0 * 14.2 15.1 94
Deadman Hill 10220 17.4 16.5 105 24.4 23.0 106
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Basin Index (%) 106* 101
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 20.6 18.6 111
Divide Peak 8880 5.6 5.7 98 28.3 26.5 107
Elk River 8700 1.5 .0 * 23.5 24.6 96
Little Snake River 8915 17.9 13.3 135 44.0 35.2 125
Old Battle 10000 38.5 32.5 118 43.1 42.1 102
Sage Creek Basin 7850 -M .0 * 19.6 17.4 113
Sandstone RS 8150 .0 .0 * 22.4 22.5 100
Whiskey Park 8950 25.4 21.9 116 38.6 33.9 114
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Basin Index (%) 121 109
UPPER GREEN RIVER
Big Sandy Opening 9080 7.4 3.1 239 18.6 16.8 111
Blind Bull Sum 8650 24.1 19.9 121 22.9 23.2 99
East Rim Divide 7930 .0 .5 0* 15.4 14.1 109
Elkhart Park G.S. 9400 9.5 5.7 167 17.9 16.7 107
Gros Ventre Summit 8750 .5 5.6 9 15.7 16.1 98
Gunsight Pass 9820 12.6 10.4 121 20.0 17.7 113
Indian Creek 9425 18.5 18.5 100 23.2 27.0 86
Kendall R.S. 7740 .1 .0 * 14.9 16.8 89
Loomis Park 8240 4.5 2.6 173 21.0 20.5 102
New Fork Lake 8340 .0 .0 * 13.9 13.5 103
Pocket Creek 9360 10.0 -M * 18.3 -M *
Snider Basin 8060 .1 .4 25* 16.4 16.8 98
Spring Creek Divide 9000 20.8 20.3 102 28.7 28.0 102
Triple Peak 8500 12.8 8.4 152 31.2 30.2 103
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Basin Index (%) 116 101
LOWER GREEN RIVER
Blacks Fork Jct 8869 .2 -M * 16.4 -M *
Buck Pasture 9632 7.8 -M * 25.2 -M *
EF Blacks Fork GS 9360 .2 -M * 16.0 -M *
Hams Fork 7840 .1 .0 * 16.0 14.4 111
Hewinta 9500 .0 .0 * 18.9 17.7 107
Hickerson Park 9122 .5 .0 * 15.1 13.4 113
Hole-in-Rock 9168 .0 .0 * 14.4 13.0 111
Indian Creek 9425 18.5 18.5 100 23.2 27.0 86
Kelley R.S. 8180 3.3 2.8 118 20.3 21.8 93
Spirit Lk 10235 11.5 -M * 21.4 -M *
Steel Creek Park 10158 14.8 14.7 101 23.7 21.0 113
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Basin Index (%) 103* 103
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 18.8 -M *
Bug Lake 7987 9.5 4.9 194 28.9 23.5 123
Burts Miller Ranch 8000 -M -M * 10.8 -M *
Chalk Creek #1 9171 17.7 15.6 113 35.1 30.8 114
Hayden Fork 9130 .3 .0 * 28.5 25.8 110
Kelley R.S. 8180 3.3 2.8 118 20.3 21.8 93
Lily Lake 9133 .7 .0 * 20.4 21.3 96
Monte Cristo 8932 26.9 14.9 181 39.1 31.6 124
Salt River Summit 7640 .2 .0 * 20.7 19.9 104
Spring Creek Divide 9000 20.8 20.3 102 28.7 28.0 102
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Basin Index (%) 136 109
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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.
