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 TUESDAY: MAY 8 , 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 8.3 5.5 151 25.7 23.5 109
Black Bear 8170 46.8 36.9 127 46.9 42.8 110
Blind Bull Sum 8650 -M 22.6 * 22.6 22.0 103
Cottonwood Creek 7670 12.7 13.3 95 30.8 28.6 108
East Rim Divide 7930 .0 6.6 0 14.2 13.4 106
Grand Targhee 9260 54.0 46.4 116 39.2 35.9 109
Granite Creek 6770 5.9 6.3 94 24.6 21.9 112
Grassy Lake 7265 23.9 26.7 90 41.1 40.3 102
Gros Ventre Summit 8750 11.3 10.0 113 17.5 15.2 115
Gunsight Pass 9820 14.9 11.8 126 19.5 16.7 117
Lewis Lake Divide 7850 39.8 29.5 135 -M 39.5 *
Phillips Bench 8200 26.2 23.4 112 33.0 31.6 104
Salt River Summit 7640 .0 5.7 0 14.9 18.9 79
Snake River Station 6920 3.4 3.5 97 27.3 25.4 107
Spring Creek Divide 9000 24.2 24.0 101 27.8 26.9 103
Thumb Divide 7980 10.5 9.4 112 22.3 21.6 103
Togwotee Pass 9580 32.5 25.2 129 38.5 28.3 136
Two Ocean Plateau 9240 38.1 29.7 128 34.8 30.9 113
Willow Creek 8080 26.1 21.5 121 42.0 38.9 108
Younts Peak 8350 -M 15.6 * -M 18.3 *
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Basin Index (%) 113 108
MADISON-GALLATIN
Black Bear 8170 46.8 36.9 127 46.9 42.8 110
Canyon 7870 12.8 8.0 160 22.1 18.6 119
Madison Plateau 7750 27.1 20.6 132 32.0 29.8 107
West Yellowstone 6700 .0 .0 * 20.3 16.5 123
Whiskey Creek 6800 13.5 11.5 117 23.3 22.9 102
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Basin Index (%) 130 111
YELLOWSTONE
Beartooth Lake 9360 36.9 23.0 160 39.4 22.8 173
Burnt Mtn 5880 .1 .0 * 18.6 16.9 110
Canyon 7870 12.8 8.0 160 22.1 18.6 119
Cole Creek 7850 15.5 17.0 91 15.4 17.5 88
Evening Star 9200 41.0 25.2 163 48.9 31.5 155
Fisher Creek 9100 54.6 33.8 162 52.4 36.3 144
Northeast Entrance 7350 3.6 1.0 360 20.8 14.4 144
Parker Peak 9400 35.6 21.7 164 33.8 20.9 162
Sylvan Lake 8420 24.1 18.2 132 32.1 26.0 123
Thumb Divide 7980 10.5 9.4 112 22.3 21.6 103
Two Ocean Plateau 9240 38.1 29.7 128 34.8 30.9 113
White Mill 8700 40.9 24.5 167 36.1 27.2 133
Wolverine 7650 11.5 .4 2875* 24.0 14.3 168
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Basin Index (%) 153 134
WIND RIVER
Burroughs Creek 8750 8.3 -M * 20.8 -M *
Castle Creek 8400 .1 -M * 11.7 -M *
Cold Springs 9630 .0 1.6 0 11.5 13.2 87
Deer Park 9700 10.0 14.6 68 18.8 24.3 77
Hobbs Park 10100 15.6 15.9 98 17.5 17.6 99
Kirwin 9550 16.8 10.8 156 20.9 14.6 143
Little Warm 9370 11.5 6.9 167 19.6 16.1 122
Owl Creek 8975 -M .5 * 8.7 8.4 104
South Pass 9040 7.2 12.6 57 11.3 21.1 54
St. Lawrence Alt 8620 .0 1.4 0 9.6 12.2 79
Togwotee Pass 9580 32.5 25.2 129 38.5 28.3 136
Townsend Creek 8700 .0 4.8 0 12.0 15.6 77
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Basin Index (%) 100 98
BIGHORN BASIN
Bald Mtn. 9380 22.3 20.4 109 19.9 20.7 96
Bear Trap Meadow 8200 .4 .2 200* 12.4 11.4 109
Bone Springs Div 9350 19.9 16.4 121 18.6 19.3 96
Grave Springs 8550 4.5 8.2 55 6.9 13.7 50
Kirwin 9550 16.8 10.8 156 20.9 14.6 143
Marquette 8760 4.7 -M * 13.4 -M *
Middle Powder 7760 5.1 11.1 46 8.1 15.0 54
Owl Creek 8975 -M .5 * 8.7 8.4 104
Powder River Pass 9480 12.7 9.0 141 18.3 16.0 114
Shell Creek 9580 21.5 16.6 130 19.1 17.3 110
Timber Creek 7950 .0 1.8 0 -M 10.7 *
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Basin Index (%) 109 97
SHOSHONE RIVER
Blackwater 9780 35.8 25.2 142 36.4 24.3 150
Evening Star 9200 41.0 25.2 163 48.9 31.5 155
Marquette 8760 4.7 -M * 13.4 -M *
Sylvan Road 7120 .1 2.4 4 25.0 19.2 130
Younts Peak 8350 -M 15.6 * -M 18.3 *
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Basin Index (%) 146 147
POWDER RIVER
Bear Trap Meadow 8200 .4 .2 200* 12.4 11.4 109
Cloud Peak Reservoir 9860 14.3 16.6 86 18.4 17.8 103
Grave Springs 8550 4.5 8.2 55 6.9 13.7 50
Hansen Sawmill 8360 3.1 1.5 207 13.4 11.6 116
Middle Powder 7760 5.1 11.1 46 8.1 15.0 54
Powder River Pass 9480 12.7 9.0 141 18.3 16.0 114
Soldier Park 8720 1.5 -M * 13.1 -M *
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Basin Index (%) 86 91
TONGUE RIVER
Big Goose 7990 6.0 10.3 58 12.0 15.4 78
Bone Springs Div 9350 19.9 16.4 121 18.6 19.3 96
Burgess Junction 7880 9.4 11.4 82 11.5 15.7 73
Dome Lake 8880 11.9 11.2 106 16.1 17.5 92
Little Goose 8870 7.1 -M * 15.9 -M *
Sucker Creek 8880 7.6 12.3 62 12.8 18.6 69
Tie Creek 6870 .1 1.8 6 12.3 15.5 79
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Basin Index (%) 87 82
BELLE FOURCHE
Cole Canyon 5910 .0 .0 * 13.0 13.2 98
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Basin Index (%) * 98
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 13.8 15.1 91
North Rapid Creek 6130 .0 .0 * 11.6 13.0 89
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Basin Index (%) * 90
UPPER N. PLATTE
Arapaho Ridge 10960 20.6 22.3 92 25.5 27.0 94
Blackhall Mtn 9820 23.3 -M * 30.7 -M *
Columbine 9160 11.9 14.4 83 29.6 29.3 101
Divide Peak 8880 1.8 15.6 12 20.4 25.2 81
Joe Wright 10120 21.2 22.9 93 35.9 30.9 116
Laprele Creek 8375 .1 4.0 2 10.3 15.8 65
Med Bow 10500 43.0 -M * 38.9 -M *
North French Creek 10130 26.5 32.8 81 31.9 31.9 100
Never Summer 10280 22.0 22.1 100 20.7 -M *
Old Battle 10000 26.2 36.2 72 27.6 40.4 68
Rawah 9020 3.2 3.4 94 18.4 17.9 103
Sage Creek Basin 7850 -M .0 * 11.6 16.7 69
Sand Lake 10050 27.9 31.8 88 27.1 30.1 90
South Brush Creek 8440 .0 6.2 0 14.2 18.7 76
Tower 10500 43.4 51.4 84 42.7 46.1 93
Webber Springs 9250 11.2 20.2 55 24.4 30.8 79
Willow Creek Pass 9540 13.7 14.0 98 17.7 16.3 109
Zirkel 9340 10.5 20.1 52 35.1 32.0 110
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Basin Index (%) 76 91
SWEETWATER
Deer Park 9700 10.0 14.6 68 18.8 24.3 77
Larsen Creek 9000 .1 7.1 1 13.0 -M *
South Pass 9040 7.2 12.6 57 11.3 21.1 54
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Basin Index (%) 50 66
LOWER N. PLATTE
Casper Mtn. 7900 -M 11.9 * 9.1 19.0 48
Laprele Creek 8375 .1 4.0 2 10.3 15.8 65
Reno Hill 8400 4.6 11.4 40 14.4 19.9 72
Windy Peak 7900 .1 1.6 6 10.6 13.6 78
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Basin Index (%) 28 65
LARAMIE RIVER
Brooklyn Lake 10240 20.2 21.9 92 29.2 25.7 114
Cinnabar Park 9574 15.3 18.0 85 27.8 28.0 99
Crow Creek 8330 .0 .0 * 13.7 14.1 97
Deadman Hill 10220 20.0 18.7 107 23.8 21.5 111
Rawah 9020 3.2 3.4 94 18.4 17.9 103
Roach 9700 11.1 16.4 68 20.9 23.1 90
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Basin Index (%) 89 103
S. PLATTE
Black Mountain 8920 4.3 -M * 16.4 -M *
Crow Creek 8330 .0 .0 * 13.7 14.1 97
Deadman Hill 10220 20.0 18.7 107 23.8 21.5 111
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Basin Index (%) 107* 105
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 13.5 17.7 76
Divide Peak 8880 1.8 15.6 12 20.4 25.2 81
Elk River 8700 .1 9.3 1 19.2 23.5 82
Little Snake River 8915 11.1 20.9 53 31.2 34.0 92
Old Battle 10000 26.2 36.2 72 27.6 40.4 68
Sage Creek Basin 7850 -M .0 * 11.6 16.7 69
Sandstone RS 8150 .0 2.7 0 12.0 21.5 56
Whiskey Park 8950 18.3 27.0 68 29.2 32.6 90
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Basin Index (%) 51 78
UPPER GREEN RIVER
Big Sandy Opening 9080 6.5 8.7 75 14.9 15.9 94
Blind Bull Sum 8650 -M 22.6 * 22.6 22.0 103
East Rim Divide 7930 .0 6.6 0 14.2 13.4 106
Elkhart Park G.S. 9400 6.7 9.8 68 13.5 15.7 86
Gros Ventre Summit 8750 11.3 10.0 113 17.5 15.2 115
Gunsight Pass 9820 14.9 11.8 126 19.5 16.7 117
Kendall R.S. 7740 .2 .2 100* 17.2 16.0 108
Loomis Park 8240 8.5 8.0 106 20.9 19.6 107
New Fork Lake 8340 .1 3.5 3 13.4 12.7 106
Pocket Creek 9360 6.0 -M * 10.7 -M *
Snider Basin 8060 .0 7.6 0 16.1 16.1 100
Spring Creek Divide 9000 24.2 24.0 101 27.8 26.9 103
Triple Peak 8500 23.1 15.3 151 35.6 28.9 123
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Basin Index (%) 91 106
LOWER GREEN RIVER
Blacks Fork Jct 8869 .1 -M * 11.3 -M *
Buck Pasture 9632 5.2 -M * 16.8 -M *
EF Blacks Fork GS 9360 .0 -M * 9.0 -M *
Hams Fork 7840 .0 .3 0* 11.9 13.6 88
Hewinta 9500 .0 2.9 0 14.0 16.9 83
Hickerson Park 9122 .4 1.2 33 10.4 12.6 83
Hole-in-Rock 9168 .0 .7 0* 11.2 12.1 93
Indian Creek 9425 16.0 21.1 76 18.7 25.8 72
Kelley R.S. 8180 4.0 8.9 45 17.0 20.8 82
Spirit Lk 10235 5.4 -M * 15.1 -M *
Steel Creek Park 10158 14.7 17.7 83 17.8 19.9 89
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Basin Index (%) 66* 83
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 12.0 -M *
Bug Lake 7987 3.8 12.6 30 18.7 22.4 83
Burts Miller Ranch 8000 .1 -M * 6.9 -M *
Chalk Creek #1 9171 4.2 22.2 19 18.4 29.4 63
Hayden Fork 9130 .1 6.6 2 18.6 24.6 76
Kelley R.S. 8180 4.0 8.9 45 17.0 20.8 82
Lily Lake 9133 .0 7.0 0 13.2 20.3 65
Monte Cristo 8932 14.7 22.7 65 25.4 30.3 84
Salt River Summit 7640 .0 5.7 0 14.9 18.9 79
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Basin Index (%) 31 76
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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.