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 3 , 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 12.7 8.4 151 25.8 22.9 113
Black Bear 8170 47.4 37.3 127 46.8 42.0 111
Blind Bull Sum 8650 39.9 22.9 174 22.5 21.5 105
Cottonwood Creek 7670 17.6 14.7 120 30.8 27.7 111
East Rim Divide 7930 2.6 7.9 33 14.1 13.0 108
Grand Targhee 9260 53.9 45.5 118 38.8 34.9 111
Granite Creek 6770 10.6 7.8 136 24.6 21.5 114
Grassy Lake 7265 28.2 28.3 100 41.0 39.5 104
Gros Ventre Summit 8750 14.2 11.3 126 17.5 14.7 119
Gunsight Pass 9820 17.8 12.1 147 19.5 16.2 120
Lewis Lake Divide 7850 43.5 29.7 146 -M 38.8 *
Phillips Bench 8200 29.5 24.8 119 33.0 30.9 107
Salt River Summit 7640 2.4 7.6 32 14.8 18.5 80
Snake River Station 6920 9.9 6.2 160 27.4 24.9 110
Spring Creek Divide 9000 27.4 24.3 113 27.8 26.4 105
Thumb Divide 7980 15.6 11.3 138 22.3 21.1 106
Togwotee Pass 9580 35.5 24.7 144 38.5 27.5 140
Two Ocean Plateau 9240 43.6 29.9 146 34.7 30.3 115
Willow Creek 8080 31.6 22.3 142 42.0 37.9 111
Younts Peak 8350 -M 15.7 * -M 17.8 *
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Basin Index (%) 128 111
MADISON-GALLATIN
Black Bear 8170 47.4 37.3 127 46.8 42.0 111
Canyon 7870 16.2 9.6 169 22.0 18.1 122
Madison Plateau 7750 29.7 21.0 141 31.9 29.1 110
West Yellowstone 6700 3.5 .6 583* 20.2 16.0 126
Whiskey Creek 6800 15.5 13.8 112 23.1 22.5 103
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Basin Index (%) 136 113
YELLOWSTONE
Beartooth Lake 9360 41.5 22.7 183 39.3 22.1 178
Burnt Mtn 5880 2.3 .0 * 18.2 16.1 113
Canyon 7870 16.2 9.6 169 22.0 18.1 122
Cole Creek 7850 17.0 16.7 102 15.4 16.6 93
Evening Star 9200 43.9 24.8 177 -M 30.6 *
Fisher Creek 9100 56.7 32.6 174 52.2 35.4 147
Northeast Entrance 7350 8.4 2.0 420 20.5 13.9 147
Parker Peak 9400 38.7 21.2 183 33.7 20.2 167
Sylvan Lake 8420 24.9 19.3 129 32.0 25.3 126
Thumb Divide 7980 15.6 11.3 138 22.3 21.1 106
Two Ocean Plateau 9240 43.6 29.9 146 34.7 30.3 115
White Mill 8700 43.3 23.9 181 35.9 26.5 135
Wolverine 7650 17.7 1.4 1264 23.9 13.9 172
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Basin Index (%) 172 135
WIND RIVER
Burroughs Creek 8750 12.6 -M * 20.7 -M *
Castle Creek 8400 .5 -M * 11.8 -M *
Cold Springs 9630 4.3 1.3 331 11.3 12.6 90
Deer Park 9700 11.8 15.7 75 18.6 23.6 79
Hobbs Park 10100 17.3 16.0 108 17.2 16.9 102
Kirwin 9550 19.6 10.6 185 20.8 14.0 149
Little Warm 9370 15.0 8.4 179 19.5 15.5 126
Owl Creek 8975 .7 .7 100 8.7 8.1 107
South Pass 9040 10.2 14.4 71 -M 20.5 *
St. Lawrence Alt 8620 .0 2.1 0 9.5 11.7 81
Togwotee Pass 9580 35.5 24.7 144 38.5 27.5 140
Townsend Creek 8700 2.9 6.9 42 11.3 15.1 75
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Basin Index (%) 116 107
BIGHORN BASIN
Bald Mtn. 9380 23.1 20.5 113 19.7 19.9 99
Bear Trap Meadow 8200 5.6 .6 933 12.3 10.8 114
Bone Springs Div 9350 22.7 16.4 138 18.3 18.4 99
Grave Springs 8550 6.5 9.4 69 -M 13.0 *
Kirwin 9550 19.6 10.6 185 20.8 14.0 149
Marquette 8760 7.3 -M * 13.3 -M *
Middle Powder 7760 8.7 11.4 76 -M 14.3 *
Owl Creek 8975 .7 .7 100 8.7 8.1 107
Powder River Pass 9480 15.2 9.1 167 18.1 15.2 119
Shell Creek 9580 23.7 16.0 148 19.0 16.5 115
Timber Creek 7950 1.7 2.7 63 -M 10.2 *
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Basin Index (%) 131 114
SHOSHONE RIVER
Blackwater 9780 38.0 25.7 148 36.3 23.7 153
Evening Star 9200 43.9 24.8 177 -M 30.6 *
Marquette 8760 7.3 -M * 13.3 -M *
Sylvan Road 7120 5.3 4.6 115 25.1 18.7 134
Younts Peak 8350 -M 15.7 * -M 17.8 *
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Basin Index (%) 158 145*
POWDER RIVER
Bear Trap Meadow 8200 5.6 .6 933 12.3 10.8 114
Cloud Peak Reservoir 9860 17.1 16.4 104 18.0 16.9 107
Grave Springs 8550 6.5 9.4 69 -M 13.0 *
Hansen Sawmill 8360 6.6 1.8 367 13.2 11.0 120
Middle Powder 7760 8.7 11.4 76 -M 14.3 *
Powder River Pass 9480 15.2 9.1 167 18.1 15.2 119
Soldier Park 8720 4.8 -M * 12.9 -M *
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Basin Index (%) 123 114
TONGUE RIVER
Big Goose 7990 8.4 9.3 90 11.8 14.3 83
Bone Springs Div 9350 22.7 16.4 138 18.3 18.4 99
Burgess Junction 7880 11.4 11.8 97 11.4 15.0 76
Dome Lake 8880 14.3 11.3 127 16.0 16.6 96
Little Goose 8870 9.6 -M * 15.8 -M *
Sucker Creek 8880 10.9 12.0 91 12.6 17.6 72
Tie Creek 6870 1.1 2.5 44 12.2 14.6 84
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Basin Index (%) 109 85
BELLE FOURCHE
Cole Canyon 5910 .1 .1 100* 12.9 12.3 105
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Basin Index (%) 100* 105
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .2 0* 13.7 14.6 94
North Rapid Creek 6130 .0 .5 0* 11.0 12.6 87
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Basin Index (%) 0* 91
UPPER N. PLATTE
Arapaho Ridge 10960 21.2 22.3 95 24.4 26.4 92
Blackhall Mtn 9820 26.0 -M * 30.4 -M *
Columbine 9160 16.6 17.5 95 29.4 28.8 102
Divide Peak 8880 7.2 17.8 40 20.5 24.6 83
Joe Wright 10120 21.9 22.9 96 35.1 30.2 116
Laprele Creek 8375 .1 5.6 2 9.9 15.2 65
Med Bow 10500 43.6 -M * 38.5 -M *
North French Creek 10130 28.7 32.8 88 31.6 31.1 102
Never Summer 10280 21.5 21.8 99 19.6 -M *
Old Battle 10000 27.1 34.7 78 27.0 39.5 68
Rawah 9020 5.0 5.2 96 17.7 17.5 101
Sage Creek Basin 7850 -M 1.0 * 11.6 16.3 71
Sand Lake 10050 29.0 31.5 92 26.6 29.3 91
South Brush Creek 8440 .1 8.4 1 13.7 18.1 76
Tower 10500 45.1 50.4 89 42.0 45.1 93
Webber Springs 9250 14.2 21.3 67 24.2 30.2 80
Willow Creek Pass 9540 13.8 14.5 95 16.8 16.0 105
Zirkel 9340 16.7 20.8 80 35.0 31.2 112
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Basin Index (%) 82 91
SWEETWATER
Deer Park 9700 11.8 15.7 75 18.6 23.6 79
Larsen Creek 9000 3.8 8.6 44 13.1 -M *
South Pass 9040 10.2 14.4 71 -M 20.5 *
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Basin Index (%) 67 79*
LOWER N. PLATTE
Casper Mtn. 7900 4.2 12.8 33 8.2 18.3 45
Laprele Creek 8375 .1 5.6 2 9.9 15.2 65
Reno Hill 8400 8.2 12.2 67 14.0 19.2 73
Windy Peak 7900 .9 3.4 26 10.6 13.2 80
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Basin Index (%) 39 65
LARAMIE RIVER
Brooklyn Lake 10240 23.4 23.1 101 28.8 25.0 115
Cinnabar Park 9574 18.2 19.0 96 27.7 27.3 101
Crow Creek 8330 .3 .0 * 13.2 13.6 97
Deadman Hill 10220 20.2 19.2 105 22.8 20.9 109
Rawah 9020 5.0 5.2 96 17.7 17.5 101
Roach 9700 11.5 17.1 67 19.7 22.5 88
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Basin Index (%) 94 102
S. PLATTE
Black Mountain 8920 6.0 -M * 15.4 -M *
Crow Creek 8330 .3 .0 * 13.2 13.6 97
Deadman Hill 10220 20.2 19.2 105 22.8 20.9 109
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Basin Index (%) 107* 104
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 12.8 17.3 74
Divide Peak 8880 7.2 17.8 40 20.5 24.6 83
Elk River 8700 4.9 12.5 39 18.7 23.0 81
Little Snake River 8915 15.3 21.8 70 31.2 33.1 94
Old Battle 10000 27.1 34.7 78 27.0 39.5 68
Sage Creek Basin 7850 -M 1.0 * 11.6 16.3 71
Sandstone RS 8150 .0 5.1 0 11.3 21.0 54
Whiskey Park 8950 20.7 26.8 77 29.2 31.8 92
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Basin Index (%) 63 79
UPPER GREEN RIVER
Big Sandy Opening 9080 10.3 9.8 105 15.0 15.3 98
Blind Bull Sum 8650 39.9 22.9 174 22.5 21.5 105
East Rim Divide 7930 2.6 7.9 33 14.1 13.0 108
Elkhart Park G.S. 9400 10.4 10.8 96 13.5 15.2 89
Gros Ventre Summit 8750 14.2 11.3 126 17.5 14.7 119
Gunsight Pass 9820 17.8 12.1 147 19.5 16.2 120
Kendall R.S. 7740 6.0 3.2 188 17.3 15.6 111
Loomis Park 8240 12.8 10.5 122 21.0 19.1 110
New Fork Lake 8340 4.3 6.0 72 12.9 12.3 105
Pocket Creek 9360 8.6 -M * 10.6 -M *
Snider Basin 8060 .0 8.9 0 16.1 15.7 103
Spring Creek Divide 9000 27.4 24.3 113 27.8 26.4 105
Triple Peak 8500 28.3 16.7 169 35.6 28.1 127
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Basin Index (%) 120 109
LOWER GREEN RIVER
Blacks Fork Jct 8869 .8 -M * 11.3 -M *
Buck Pasture 9632 8.3 -M * 16.7 -M *
EF Blacks Fork GS 9360 4.0 -M * 9.0 -M *
Hams Fork 7840 .0 2.0 0 11.9 13.2 90
Hewinta 9500 .5 4.4 11 14.1 16.4 86
Hickerson Park 9122 1.4 3.5 40 10.3 12.2 84
Hole-in-Rock 9168 1.6 2.0 80 11.2 11.6 97
Indian Creek 9425 20.2 22.5 90 18.6 25.2 74
Kelley R.S. 8180 8.2 10.8 76 17.0 20.3 84
Spirit Lk 10235 7.7 -M * 15.0 -M *
Steel Creek Park 10158 14.9 17.4 86 17.9 19.3 93
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Basin Index (%) 75 85
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 12.1 -M *
Bug Lake 7987 8.8 14.2 62 18.7 21.8 86
Burts Miller Ranch 8000 .1 -M * 6.9 -M *
Chalk Creek #1 9171 8.8 23.8 37 18.5 28.7 64
Hayden Fork 9130 .4 8.8 5 18.7 24.0 78
Kelley R.S. 8180 8.2 10.8 76 17.0 20.3 84
Lily Lake 9133 2.9 9.9 29 13.3 19.8 67
Monte Cristo 8932 18.7 25.8 72 25.3 29.5 86
Salt River Summit 7640 2.4 7.6 32 14.8 18.5 80
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Basin Index (%) 50 78
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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.