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 7 , 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 9.3 6.1 152 25.7 23.4 110
Black Bear 8170 47.6 37.0 129 46.8 42.6 110
Blind Bull Sum 8650 -M 22.6 * 22.6 21.9 103
Cottonwood Creek 7670 13.9 13.5 103 30.8 28.3 109
East Rim Divide 7930 .0 6.9 0 14.2 13.3 107
Grand Targhee 9260 55.2 46.4 119 39.3 35.7 110
Granite Creek 6770 7.1 6.7 106 24.6 21.9 112
Grassy Lake 7265 25.2 27.0 93 41.1 40.1 102
Gros Ventre Summit 8750 12.1 10.2 119 17.5 15.1 116
Gunsight Pass 9820 15.1 11.7 129 19.5 16.5 118
Lewis Lake Divide 7850 40.9 29.4 139 -M 39.3 *
Phillips Bench 8200 27.1 23.6 115 33.0 31.4 105
Salt River Summit 7640 .0 6.2 0 14.9 18.8 79
Snake River Station 6920 4.8 4.0 120 27.4 25.3 108
Spring Creek Divide 9000 25.0 24.1 104 27.8 26.8 104
Thumb Divide 7980 11.7 9.7 121 22.3 21.5 104
Togwotee Pass 9580 33.6 25.0 134 38.5 28.1 137
Two Ocean Plateau 9240 38.4 29.8 129 34.8 30.8 113
Willow Creek 8080 28.0 21.7 129 42.0 38.6 109
Younts Peak 8350 -M 15.6 * -M 18.3 *
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Basin Index (%) 117 109
MADISON-GALLATIN
Black Bear 8170 47.6 37.0 129 46.8 42.6 110
Canyon 7870 13.6 8.2 166 22.0 18.5 119
Madison Plateau 7750 28.0 20.7 135 32.1 29.6 108
West Yellowstone 6700 .1 .0 * 20.2 16.4 123
Whiskey Creek 6800 14.1 11.9 118 23.3 22.8 102
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Basin Index (%) 133 111
YELLOWSTONE
Beartooth Lake 9360 37.0 22.9 162 39.4 22.7 174
Burnt Mtn 5880 .1 .0 * 18.6 16.6 112
Canyon 7870 13.6 8.2 166 22.0 18.5 119
Cole Creek 7850 15.1 16.9 89 15.4 17.2 90
Evening Star 9200 41.9 25.1 167 48.8 31.3 156
Fisher Creek 9100 56.2 33.4 168 52.4 36.1 145
Northeast Entrance 7350 4.3 1.0 430 20.7 14.3 145
Parker Peak 9400 36.6 21.6 169 33.8 20.7 163
Sylvan Lake 8420 24.6 18.4 134 32.1 25.9 124
Thumb Divide 7980 11.7 9.7 121 22.3 21.5 104
Two Ocean Plateau 9240 38.4 29.8 129 34.8 30.8 113
White Mill 8700 41.3 24.3 170 36.0 27.0 133
Wolverine 7650 13.3 .5 2660* 24.0 14.2 169
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Basin Index (%) 158 135
WIND RIVER
Burroughs Creek 8750 9.6 -M * 20.8 -M *
Castle Creek 8400 .1 -M * 11.8 -M *
Cold Springs 9630 .2 1.6 12 11.6 13.1 89
Deer Park 9700 10.8 14.7 73 18.9 24.2 78
Hobbs Park 10100 16.3 15.9 103 17.6 17.4 101
Kirwin 9550 17.7 10.8 164 20.9 14.5 144
Little Warm 9370 12.3 7.1 173 19.6 15.9 123
Owl Creek 8975 .0 .5 0* 8.8 8.4 105
South Pass 9040 8.2 13.1 63 11.3 21.0 54
St. Lawrence Alt 8620 .0 1.5 0 9.6 12.1 79
Togwotee Pass 9580 33.6 25.0 134 38.5 28.1 137
Townsend Creek 8700 .7 5.2 13 12.6 15.5 81
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Basin Index (%) 105 100
BIGHORN BASIN
Bald Mtn. 9380 22.6 20.4 111 19.9 20.4 98
Bear Trap Meadow 8200 2.0 .2 1000* 12.4 11.3 110
Bone Springs Div 9350 20.2 16.4 123 18.6 19.0 98
Grave Springs 8550 5.3 8.5 62 6.9 13.6 51
Kirwin 9550 17.7 10.8 164 20.9 14.5 144
Marquette 8760 5.7 -M * 13.5 -M *
Middle Powder 7760 6.1 11.2 54 7.9 14.8 53
Owl Creek 8975 .0 .5 0* 8.8 8.4 105
Powder River Pass 9480 13.6 9.0 151 18.3 15.8 116
Shell Creek 9580 22.3 16.4 136 19.1 17.0 112
Timber Creek 7950 .0 1.9 0 -M 10.6 *
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Basin Index (%) 115 99
SHOSHONE RIVER
Blackwater 9780 37.0 25.5 145 36.4 24.2 150
Evening Star 9200 41.9 25.1 167 48.8 31.3 156
Marquette 8760 5.7 -M * 13.5 -M *
Sylvan Road 7120 .1 2.9 3 25.0 19.0 132
Younts Peak 8350 -M 15.6 * -M 18.3 *
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Basin Index (%) 148 148
POWDER RIVER
Bear Trap Meadow 8200 2.0 .2 1000* 12.4 11.3 110
Cloud Peak Reservoir 9860 15.7 16.5 95 18.4 17.5 105
Grave Springs 8550 5.3 8.5 62 6.9 13.6 51
Hansen Sawmill 8360 4.6 1.5 307 13.4 11.4 118
Middle Powder 7760 6.1 11.2 54 7.9 14.8 53
Powder River Pass 9480 13.6 9.0 151 18.3 15.8 116
Soldier Park 8720 3.2 -M * 13.2 -M *
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Basin Index (%) 101 92
TONGUE RIVER
Big Goose 7990 6.9 10.1 68 12.0 15.1 79
Bone Springs Div 9350 20.2 16.4 123 18.6 19.0 98
Burgess Junction 7880 10.1 11.4 89 11.6 15.5 75
Dome Lake 8880 12.8 11.2 114 16.1 17.2 94
Little Goose 8870 8.1 -M * 15.9 -M *
Sucker Creek 8880 8.7 12.1 72 12.9 18.3 70
Tie Creek 6870 .1 2.1 5 12.3 15.1 81
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Basin Index (%) 93 83
BELLE FOURCHE
Cole Canyon 5910 .0 .0 * 13.0 12.9 101
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Basin Index (%) * 101
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 13.7 14.9 92
North Rapid Creek 6130 .0 .0 * 11.2 12.9 87
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Basin Index (%) * 90
UPPER N. PLATTE
Arapaho Ridge 10960 21.1 22.3 95 25.5 26.9 95
Blackhall Mtn 9820 24.1 -M * 30.7 -M *
Columbine 9160 13.1 15.1 87 29.7 29.3 101
Divide Peak 8880 2.9 16.3 18 20.5 25.0 82
Joe Wright 10120 21.7 22.9 95 35.8 30.8 116
Laprele Creek 8375 .1 4.6 2 10.4 15.6 67
Med Bow 10500 43.6 -M * 38.9 -M *
North French Creek 10130 27.5 32.8 84 31.9 31.6 101
Never Summer 10280 22.3 22.0 101 20.7 -M *
Old Battle 10000 26.6 35.8 74 27.6 40.2 69
Rawah 9020 3.9 3.8 103 18.5 17.8 104
Sage Creek Basin 7850 -M .2 * 11.6 16.6 70
Sand Lake 10050 28.5 31.8 90 27.1 29.9 91
South Brush Creek 8440 .0 6.7 0 14.0 18.5 76
Tower 10500 44.6 51.3 87 42.8 45.9 93
Webber Springs 9250 12.0 20.5 59 24.4 30.6 80
Willow Creek Pass 9540 14.0 14.3 98 17.7 16.2 109
Zirkel 9340 11.9 20.2 59 35.1 31.8 110
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Basin Index (%) 78 92
SWEETWATER
Deer Park 9700 10.8 14.7 73 18.9 24.2 78
Larsen Creek 9000 .4 7.4 5 13.0 -M *
South Pass 9040 8.2 13.1 63 11.3 21.0 54
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Basin Index (%) 55 67
LOWER N. PLATTE
Casper Mtn. 7900 .5 11.9 4 9.0 18.9 48
Laprele Creek 8375 .1 4.6 2 10.4 15.6 67
Reno Hill 8400 5.8 11.8 49 14.4 19.7 73
Windy Peak 7900 .1 2.0 5 10.7 13.5 79
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Basin Index (%) 21 66
LARAMIE RIVER
Brooklyn Lake 10240 21.3 22.2 96 29.2 25.5 115
Cinnabar Park 9574 16.2 18.1 90 27.8 27.9 100
Crow Creek 8330 .0 .0 * 13.7 14.1 97
Deadman Hill 10220 20.5 18.9 108 23.8 21.3 112
Rawah 9020 3.9 3.8 103 18.5 17.8 104
Roach 9700 11.5 16.6 69 20.9 23.0 91
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Basin Index (%) 92 103
S. PLATTE
Black Mountain 8920 5.4 -M * 16.4 -M *
Crow Creek 8330 .0 .0 * 13.7 14.1 97
Deadman Hill 10220 20.5 18.9 108 23.8 21.3 112
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Basin Index (%) 108* 106
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 13.3 17.5 76
Divide Peak 8880 2.9 16.3 18 20.5 25.0 82
Elk River 8700 .7 10.1 7 19.2 23.4 82
Little Snake River 8915 12.1 21.0 58 31.2 33.7 93
Old Battle 10000 26.6 35.8 74 27.6 40.2 69
Sage Creek Basin 7850 -M .2 * 11.6 16.6 70
Sandstone RS 8150 .0 3.2 0 12.0 21.3 56
Whiskey Park 8950 19.0 27.1 70 29.1 32.3 90
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Basin Index (%) 54 78
UPPER GREEN RIVER
Big Sandy Opening 9080 7.6 8.7 87 14.9 15.8 94
Blind Bull Sum 8650 -M 22.6 * 22.6 21.9 103
East Rim Divide 7930 .0 6.9 0 14.2 13.3 107
Elkhart Park G.S. 9400 7.8 10.0 78 13.5 15.6 87
Gros Ventre Summit 8750 12.1 10.2 119 17.5 15.1 116
Gunsight Pass 9820 15.1 11.7 129 19.5 16.5 118
Kendall R.S. 7740 1.7 .7 243* 17.2 15.9 108
Loomis Park 8240 9.5 8.4 113 20.9 19.5 107
New Fork Lake 8340 .7 4.0 18 13.4 12.6 106
Pocket Creek 9360 6.9 -M * 10.7 -M *
Snider Basin 8060 .0 7.9 0 16.2 16.0 101
Spring Creek Divide 9000 25.0 24.1 104 27.8 26.8 104
Triple Peak 8500 24.4 15.4 158 35.6 28.7 124
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Basin Index (%) 96 107
LOWER GREEN RIVER
Blacks Fork Jct 8869 .2 -M * 11.3 -M *
Buck Pasture 9632 6.1 -M * 16.7 -M *
EF Blacks Fork GS 9360 1.1 -M * 9.0 -M *
Hams Fork 7840 .0 .5 0* 11.9 13.5 88
Hewinta 9500 .0 3.4 0 14.1 16.8 84
Hickerson Park 9122 .5 1.8 28 10.5 12.5 84
Hole-in-Rock 9168 .0 1.0 0 11.3 12.0 94
Indian Creek 9425 16.9 21.3 79 18.8 25.6 73
Kelley R.S. 8180 5.0 9.2 54 17.0 20.7 82
Spirit Lk 10235 6.2 -M * 15.1 -M *
Steel Creek Park 10158 15.2 17.6 86 17.9 19.8 90
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Basin Index (%) 69 84
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 12.0 -M *
Bug Lake 7987 5.0 12.8 39 18.7 22.3 84
Burts Miller Ranch 8000 .1 -M * 6.9 -M *
Chalk Creek #1 9171 5.4 22.5 24 18.4 29.3 63
Hayden Fork 9130 .1 7.1 1 18.6 24.5 76
Kelley R.S. 8180 5.0 9.2 54 17.0 20.7 82
Lily Lake 9133 .0 7.8 0 13.2 20.2 65
Monte Cristo 8932 15.9 23.3 68 25.4 30.1 84
Salt River Summit 7640 .0 6.2 0 14.9 18.8 79
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Basin Index (%) 35 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.