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 FRIDAY: MAY 4 , 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 11.9 7.8 153 25.7 23.1 111
Black Bear 8170 47.2 37.3 127 46.8 42.2 111
Blind Bull Sum 8650 39.5 22.8 173 22.5 21.6 104
Cottonwood Creek 7670 17.0 14.4 118 30.8 27.8 111
East Rim Divide 7930 1.4 7.7 18 14.2 13.1 108
Grand Targhee 9260 54.4 45.7 119 38.9 35.2 111
Granite Creek 6770 9.8 7.6 129 24.6 21.6 114
Grassy Lake 7265 27.9 27.9 100 41.1 39.7 104
Gros Ventre Summit 8750 13.7 11.1 123 17.5 14.9 117
Gunsight Pass 9820 17.5 12.0 146 19.5 16.3 120
Lewis Lake Divide 7850 43.0 29.6 145 -M 39.0 *
Phillips Bench 8200 29.4 24.5 120 33.0 31.0 106
Salt River Summit 7640 1.8 7.4 24 14.9 18.6 80
Snake River Station 6920 9.1 5.6 162 27.3 25.0 109
Spring Creek Divide 9000 27.4 24.3 113 27.8 26.5 105
Thumb Divide 7980 14.8 10.8 137 22.2 21.3 104
Togwotee Pass 9580 -M 24.7 * -M 27.7 *
Two Ocean Plateau 9240 -M 29.9 * -M 30.5 *
Willow Creek 8080 31.6 22.0 144 42.0 38.1 110
Younts Peak 8350 -M 15.8 * -M 18.0 *
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Basin Index (%) 125 108
MADISON-GALLATIN
Black Bear 8170 47.2 37.3 127 46.8 42.2 111
Canyon 7870 15.8 9.1 174 22.1 18.2 121
Madison Plateau 7750 29.2 20.9 140 31.9 29.2 109
West Yellowstone 6700 2.3 .2 1150* 20.2 16.2 125
Whiskey Creek 6800 15.3 13.3 115 23.2 22.6 103
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Basin Index (%) 136 112
YELLOWSTONE
Beartooth Lake 9360 -M 22.7 * -M 22.2 *
Burnt Mtn 5880 1.3 .0 * 18.2 16.2 112
Canyon 7870 15.8 9.1 174 22.1 18.2 121
Cole Creek 7850 16.8 16.7 101 15.4 16.7 92
Evening Star 9200 43.4 24.9 174 48.6 30.8 158
Fisher Creek 9100 56.6 32.7 173 52.3 35.5 147
Northeast Entrance 7350 7.6 1.6 475 20.6 14.0 147
Parker Peak 9400 -M 21.2 * -M 20.3 *
Sylvan Lake 8420 24.4 19.0 128 32.0 25.4 126
Thumb Divide 7980 14.8 10.8 137 22.2 21.3 104
Two Ocean Plateau 9240 -M 29.9 * -M 30.5 *
White Mill 8700 -M 24.0 * -M 26.6 *
Wolverine 7650 16.8 1.1 1527 24.0 14.0 171
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Basin Index (%) 170 133
WIND RIVER
Burroughs Creek 8750 11.9 -M * 20.6 -M *
Castle Creek 8400 -M -M * -M -M *
Cold Springs 9630 3.6 1.4 257 11.4 12.7 90
Deer Park 9700 11.8 15.4 77 18.7 23.8 79
Hobbs Park 10100 17.5 16.0 109 17.4 17.0 102
Kirwin 9550 -M 10.6 * -M 14.1 *
Little Warm 9370 14.6 8.1 180 19.6 15.6 126
Owl Creek 8975 -M .6 * -M 8.1 *
South Pass 9040 -M 14.1 * -M 20.7 *
St. Lawrence Alt 8620 .0 2.0 0 9.5 11.8 81
Togwotee Pass 9580 -M 24.7 * -M 27.7 *
Townsend Creek 8700 -M 6.6 * -M 15.2 *
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Basin Index (%) 111* 95*
BIGHORN BASIN
Bald Mtn. 9380 23.4 20.4 115 19.9 20.0 100
Bear Trap Meadow 8200 5.3 .4 1325* 12.3 10.9 113
Bone Springs Div 9350 22.7 16.4 138 18.4 18.6 99
Grave Springs 8550 6.7 9.3 72 6.5 13.1 50
Kirwin 9550 -M 10.6 * -M 14.1 *
Marquette 8760 7.1 -M * 13.4 -M *
Middle Powder 7760 8.5 11.4 75 7.9 14.4 55
Owl Creek 8975 -M .6 * -M 8.1 *
Powder River Pass 9480 15.3 9.1 168 18.2 15.4 118
Shell Creek 9580 -M 16.0 * -M 16.6 *
Timber Creek 7950 -M 2.5 * -M 10.2 *
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Basin Index (%) 122* 90
SHOSHONE RIVER
Blackwater 9780 38.1 25.8 148 36.3 23.8 153
Evening Star 9200 43.4 24.9 174 48.6 30.8 158
Marquette 8760 7.1 -M * 13.4 -M *
Sylvan Road 7120 4.2 4.1 102 25.1 18.8 134
Younts Peak 8350 -M 15.8 * -M 18.0 *
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Basin Index (%) 156 150
POWDER RIVER
Bear Trap Meadow 8200 5.3 .4 1325* 12.3 10.9 113
Cloud Peak Reservoir 9860 17.1 16.3 105 18.2 17.0 107
Grave Springs 8550 6.7 9.3 72 6.5 13.1 50
Hansen Sawmill 8360 6.6 1.7 388 13.3 11.1 120
Middle Powder 7760 8.5 11.4 75 7.9 14.4 55
Powder River Pass 9480 15.3 9.1 168 18.2 15.4 118
Soldier Park 8720 4.8 -M * 12.9 -M *
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Basin Index (%) 123 93
TONGUE RIVER
Big Goose 7990 8.4 9.4 89 11.8 14.4 82
Bone Springs Div 9350 22.7 16.4 138 18.4 18.6 99
Burgess Junction 7880 -M 11.8 * -M 15.1 *
Dome Lake 8880 -M 11.3 * -M 16.7 *
Little Goose 8870 9.6 -M * 15.8 -M *
Sucker Creek 8880 10.7 11.9 90 12.7 17.7 72
Tie Creek 6870 -M 2.5 * -M 14.7 *
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Basin Index (%) 111* 85*
BELLE FOURCHE
Cole Canyon 5910 .0 .0 * 13.0 12.4 105
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Basin Index (%) * 105
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .2 0* 13.7 14.6 94
North Rapid Creek 6130 .0 .0 * 11.0 12.6 87
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Basin Index (%) 0* 91
UPPER N. PLATTE
Arapaho Ridge 10960 22.3 22.3 100 25.4 26.5 96
Blackhall Mtn 9820 -M -M * -M -M *
Columbine 9160 16.5 17.1 96 29.5 28.9 102
Divide Peak 8880 6.6 17.5 38 20.5 24.8 83
Joe Wright 10120 22.5 22.9 98 35.9 30.4 118
Laprele Creek 8375 .1 5.4 2 9.9 15.3 65
Med Bow 10500 43.9 -M * 38.9 -M *
North French Creek 10130 28.9 32.7 88 31.8 31.2 102
Never Summer 10280 22.7 21.8 104 20.7 -M *
Old Battle 10000 27.3 34.8 78 27.1 39.7 68
Rawah 9020 5.7 4.8 119 18.4 17.6 105
Sage Creek Basin 7850 -M .8 * 11.6 16.4 71
Sand Lake 10050 29.3 31.6 93 27.0 29.5 92
South Brush Creek 8440 -M 7.9 * -M 18.2 *
Tower 10500 45.2 50.7 89 42.6 45.3 94
Webber Springs 9250 14.3 21.1 68 24.4 30.3 81
Willow Creek Pass 9540 -M 14.5 * -M 16.0 *
Zirkel 9340 16.2 20.7 78 35.0 31.3 112
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Basin Index (%) 85 92
SWEETWATER
Deer Park 9700 11.8 15.4 77 18.7 23.8 79
Larsen Creek 9000 3.4 8.3 41 13.1 -M *
South Pass 9040 -M 14.1 * -M 20.7 *
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Basin Index (%) 64 79*
LOWER N. PLATTE
Casper Mtn. 7900 3.5 12.5 28 8.3 18.4 45
Laprele Creek 8375 .1 5.4 2 9.9 15.3 65
Reno Hill 8400 8.0 12.1 66 14.0 19.3 73
Windy Peak 7900 .4 3.1 13 10.5 13.2 80
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Basin Index (%) 36 65
LARAMIE RIVER
Brooklyn Lake 10240 23.6 23.0 103 29.1 25.1 116
Cinnabar Park 9574 18.1 18.8 96 27.8 27.3 102
Crow Creek 8330 .5 .0 * 13.7 13.7 100
Deadman Hill 10220 21.3 19.1 112 23.7 21.0 113
Rawah 9020 5.7 4.8 119 18.4 17.6 105
Roach 9700 -M 17.1 * -M 22.6 *
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Basin Index (%) 105 108
S. PLATTE
Black Mountain 8920 -M -M * -M -M *
Crow Creek 8330 .5 .0 * 13.7 13.7 100
Deadman Hill 10220 21.3 19.1 112 23.7 21.0 113
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Basin Index (%) 114* 108
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 12.7 17.4 73
Divide Peak 8880 6.6 17.5 38 20.5 24.8 83
Elk River 8700 4.5 12.0 38 18.8 23.1 81
Little Snake River 8915 15.0 21.7 69 31.2 33.2 94
Old Battle 10000 27.3 34.8 78 27.1 39.7 68
Sage Creek Basin 7850 -M .8 * 11.6 16.4 71
Sandstone RS 8150 -M 4.6 * -M 21.0 *
Whiskey Park 8950 -M 26.9 * -M 32.0 *
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Basin Index (%) 62 79
UPPER GREEN RIVER
Big Sandy Opening 9080 10.2 9.4 109 15.0 15.5 97
Blind Bull Sum 8650 39.5 22.8 173 22.5 21.6 104
East Rim Divide 7930 1.4 7.7 18 14.2 13.1 108
Elkhart Park G.S. 9400 10.0 10.6 94 13.5 15.2 89
Gros Ventre Summit 8750 13.7 11.1 123 17.5 14.9 117
Gunsight Pass 9820 17.5 12.0 146 19.5 16.3 120
Kendall R.S. 7740 -M 2.6 * -M 15.7 *
Loomis Park 8240 12.5 10.0 125 21.0 19.2 109
New Fork Lake 8340 -M 5.5 * -M 12.3 *
Pocket Creek 9360 8.6 -M * 10.6 -M *
Snider Basin 8060 .0 8.5 0 16.0 15.8 101
Spring Creek Divide 9000 27.4 24.3 113 27.8 26.5 105
Triple Peak 8500 27.8 16.3 171 35.6 28.2 126
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Basin Index (%) 121 109
LOWER GREEN RIVER
Blacks Fork Jct 8869 .2 -M * 11.3 -M *
Buck Pasture 9632 8.2 -M * 16.8 -M *
EF Blacks Fork GS 9360 3.8 -M * 9.0 -M *
Hams Fork 7840 -M 1.5 * -M 13.3 *
Hewinta 9500 .4 4.2 10 14.1 16.5 85
Hickerson Park 9122 1.2 3.2 38 10.4 12.2 85
Hole-in-Rock 9168 1.4 1.7 82 11.2 11.8 95
Indian Creek 9425 20.2 22.1 91 18.7 25.3 74
Kelley R.S. 8180 8.0 10.4 77 17.0 20.5 83
Spirit Lk 10235 7.7 -M * 15.1 -M *
Steel Creek Park 10158 -M 17.4 * -M 19.5 *
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Basin Index (%) 75* 83*
UPPER BEAR RIVER
Bear River RS 8777 -M -M * -M -M *
Bug Lake 7987 8.5 13.8 62 18.7 22.0 85
Burts Miller Ranch 8000 .1 -M * 6.9 -M *
Chalk Creek #1 9171 -M 23.4 * -M 28.9 *
Hayden Fork 9130 -M 8.6 * -M 24.1 *
Kelley R.S. 8180 8.0 10.4 77 17.0 20.5 83
Lily Lake 9133 -M 9.7 * -M 19.9 *
Monte Cristo 8932 18.7 25.3 74 25.5 29.7 86
Salt River Summit 7640 1.8 7.4 24 14.9 18.6 80
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Basin Index (%) 65* 84*
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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.