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 WEDNESDAY: MAY 12 , 2010
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BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION
Data Site Name (Ft) % %
Current Average Avg Current Average Avg
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WYOMING
SNAKE RIVER
BASE CAMP 7030 3.2 8.3 39 16.1 25.2 64
COTTONWOOD CREEK 7670 16.0 15.8 101 27.2 33.4 81
GRAND TARGHEE 9260 44.7 -M * 34.9 -M *
GRANITE CREEK 6770 3.1 9.4 33 15.0 23.2 65
GRASSY LAKE 7265 19.9 28.8 69 31.0 42.3 73
GROS VENTRE SUMMIT 8750 9.0 11.0 82 11.6 16.1 72
GUNSIGHT PASS 9820 11.7 -M * 14.7 -M *
LEWIS LAKE DIVIDE 7850 18.6 30.9 60 26.3 43.0 61
PHILLIPS BENCH 8200 18.3 26.0 70 24.8 34.3 72
SALT RIVER SUMMIT 7760 6.6 6.7 99 15.3 22.5 68
SNAKE RIVER STATION 6920 .1 7.7 1 19.4 26.5 73
SPRING CREEK DIVIDE 9000 22.9 26.2 87 22.9 31.2 73
THUMB DIVIDE 7980 7.1 11.3 63 16.6 23.0 72
TOGWOTEE PASS 9580 23.8 27.9 85 -M 30.3 *
TWO OCEAN PLATEAU 9240 26.7 31.2 86 22.2 33.5 66
WILLOW CREEK 8380 22.4 27.2 82 34.5 39.5 87
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Basin wide percent of average 74 72
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9360 17.7 25.9 68 17.7 24.7 72
BLACK BEAR 8170 28.3 37.8 75 31.7 47.4 67
CANYON 7870 7.6 8.3 92 14.1 18.6 76
FISHER CREEK 9100 27.3 37.5 73 29.4 43.5 68
MADISON PLATEAU 7750 17.0 21.2 80 25.0 31.6 79
NORTHEAST ENTRANCE 7350 1.1 4.7 23 11.5 15.7 73
PARKER PEAK 9400 22.3 24.3 92 16.7 20.7 81
SYLVAN LAKE 8420 14.3 21.6 66 22.1 26.0 85
THUMB DIVIDE 7980 7.1 11.3 63 16.6 23.0 72
TWO OCEAN PLATEAU 9240 26.7 31.2 86 22.2 33.5 66
WHISKEY CREEK 6800 9.5 11.7 81 16.2 25.2 64
WHITE MILL 8700 19.7 25.7 77 20.4 32.6 63
WOLVERINE 7650 .0 4.5 0 9.6 16.3 59
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Basin wide percent of average 75 71
WIND RIVER
BURROUGHS CREEK 8750 11.6 11.2 104 12.8 20.4 63
COLD SPRINGS 9630 8.7 4.1 212 17.1 15.1 113
DEER PARK 9700 21.8 16.8 130 26.8 28.3 95
HOBBS PARK 10100 24.6 17.4 141 25.2 18.4 137
LITTLE WARM 9370 10.1 8.7 116 13.9 18.0 77
SOUTH PASS 9040 18.7 15.5 121 24.6 24.1 102
ST. LAWRENCE ALT 8620 9.2 4.7 196 18.5 13.3 139
TOGWOTEE PASS 9580 23.8 27.9 85 -M 30.3 *
TOWNSEND CREEK 8700 15.4 6.8 226 22.8 16.8 136
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Basin wide percent of average 127 105
BIGHORN BASIN
BALD MTN. 9380 18.3 23.5 78 15.3 22.8 67
BEAR TRAP MEADOW 8200 4.9 1.3 377 11.9 12.0 99
BLACKWATER 9780 22.8 28.7 79 21.5 26.1 82
BONE SPRINGS DIV 9350 15.0 17.1 88 14.5 19.7 74
EVENING STAR 9200 21.7 33.0 66 26.0 31.4 83
GRAVE SPRINGS 8550 11.8 9.4 126 16.2 14.3 113
KIRWIN 9550 13.1 12.0 109 15.2 15.4 99
MARQUETTE 8760 12.6 9.8 129 15.6 15.2 103
MIDDLE POWDER 7760 13.6 12.1 112 12.7 17.0 75
OWL CREEK 8975 3.5 3.0 117 11.0 9.2 120
POWDER RIVER PASS 9480 9.1 9.0 101 14.8 17.1 87
SHELL CREEK 9580 16.1 16.8 96 15.7 18.2 86
SYLVAN LAKE 8420 14.3 21.6 66 22.1 26.0 85
SYLVAN ROAD 7120 .0 4.1 0 15.9 21.5 74
TIMBER CREEK 7950 5.3 3.0 177 12.8 11.9 108
YOUNTS PEAK 8350 13.0 16.6 78 13.3 19.8 67
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Basin wide percent of average 88 86
SHOSHONE RIVER
BLACKWATER 9780 22.8 28.7 79 21.5 26.1 82
EVENING STAR 9200 21.7 33.0 66 26.0 31.4 83
KIRWIN 9550 13.1 12.0 109 15.2 15.4 99
MARQUETTE 8760 12.6 9.8 129 15.6 15.2 103
SYLVAN LAKE 8420 14.3 21.6 66 22.1 26.0 85
SYLVAN ROAD 7120 .0 4.1 0 15.9 21.5 74
YOUNTS PEAK 8350 13.0 16.6 78 13.3 19.8 67
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Basin wide percent of average 78 83
POWDER-TONGUE
BEAR TRAP MEADOW 8200 4.9 1.3 377 11.9 12.0 99
BIG GOOSE 7990 12.3 9.9 124 16.5 14.3 115
BONE SPRINGS DIV 9350 15.0 17.1 88 14.5 19.7 74
BURGESS JUNCTION 7880 14.2 11.4 125 15.7 16.6 95
CLOUD PEAK RESERVOIR 9860 18.6 15.5 120 18.3 18.8 97
DOME LAKE 8880 12.9 11.4 113 17.9 18.2 98
GRAVE SPRINGS 8550 11.8 9.4 126 16.2 14.3 113
HANSEN SAWMILL 8360 5.2 3.2 163 13.0 12.0 108
MIDDLE POWDER 7760 13.6 12.1 112 12.7 17.0 75
POWDER RIVER PASS 9480 9.1 9.0 101 14.8 17.1 87
SUCKER CREEK 8880 16.8 11.2 150 20.4 19.0 107
TIE CREEK 6870 5.4 2.4 225 16.9 14.9 113
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Basin wide percent of average 123 97
BELLE FOURCHE
BLIND PARK 6890 2.2 1.3 169 17.2 15.5 111
COLE CANYON 5910 3.3 1.4 236 15.9 10.8 147
NORTH RAPID CREEK 6130 .6 1.1 55 16.1 12.4 130
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Basin wide percent of average 161 127
UPPER N. PLATTE RIVER
COLUMBINE 9160 18.3 15.7 117 28.5 30.3 94
DIVIDE PEAK 8880 20.9 15.0 139 29.2 25.4 115
ELK RIVER 8700 14.4 9.8 147 25.3 24.1 105
JOE WRIGHT 10120 24.2 24.6 98 28.8 31.8 91
NORTH FRENCH CREEK 10130 43.0 34.0 126 43.0 31.4 137
OLD BATTLE 10000 41.8 36.6 114 44.7 41.6 107
SAGE CREEK BASIN 7850 5.2 8.7 60 15.9 14.8 107
SOUTH BRUSH CREEK 8440 12.3 7.9 156 24.5 21.4 114
TOWER 10500 42.1 52.2 81 40.6 47.1 86
WEBBER SPRINGS 9250 24.2 20.6 117 35.0 32.5 108
WILLOW CREEK PASS 9540 13.1 12.6 104 16.4 16.7 98
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Basin wide percent of average 109 105
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 25.6 25.3 101 28.8 28.6 101
CASPER MTN. 7900 16.4 13.7 120 19.4 21.2 92
DEADMAN HILL 10220 -M 18.9 * -M 22.4 *
DEER PARK 9700 21.8 16.8 130 26.8 28.3 95
LAPRELE CREEK 8375 6.4 4.6 139 17.7 17.8 99
RENO HILL 8400 17.1 11.4 150 24.0 21.9 110
ROACH 9700 22.1 15.3 144 28.1 23.9 118
SAND LAKE 10050 39.3 36.4 108 39.0 31.2 125
SOUTH PASS 9040 18.7 15.5 121 24.6 24.1 102
WINDY PEAK 7900 7.2 2.5 288 16.9 14.7 115
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Basin wide percent of average 123 106
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 .1 1.7 6 18.8 19.5 96
DIVIDE PEAK 8880 20.9 15.0 139 29.2 25.4 115
OLD BATTLE 10000 41.8 36.6 114 44.7 41.6 107
SANDSTONE RS 8150 6.6 5.3 125 21.8 23.0 95
WHISKEY PARK 8950 27.8 28.3 98 38.4 35.5 108
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Basin wide percent of average 112 105
UPPER GREEN RIVER
BIG SANDY OPENING 9080 8.2 10.5 78 12.4 16.9 73
BLIND BULL SUM 8650 20.7 26.0 80 16.6 26.2 63
EAST RIM DIVIDE 7930 .3 10.6 3 9.1 14.6 62
ELKHART PARK G.S. 9400 7.8 10.6 74 11.5 17.0 68
GROS VENTRE SUMMIT 8750 9.0 11.0 82 11.6 16.1 72
GUNSIGHT PASS 9820 11.7 -M * 14.7 -M *
KENDALL R.S. 7740 .2 5.7 4 10.7 17.2 62
LOOMIS PARK 8240 4.5 11.2 40 13.0 20.8 63
NEW FORK LAKE 8340 1.4 5.3 26 8.4 14.2 59
POCKET CREEK 9360 8.6 -M * 14.1 -M *
SNIDER BASIN 8060 -M 9.3 * 15.7 19.2 82
SPRING CREEK DIVIDE 9000 22.9 26.2 87 22.9 31.2 73
TRIPLE PEAK 8500 -M 19.4 * 26.8 29.9 90
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Basin wide percent of average 64 71
LOWER GREEN RIVER
HAMS FORK 7840 -M 2.6 * 13.8 15.6 88
HEWINTA 9519 8.3 5.9 141 17.1 18.7 91
HICKERSON PARK 9145 -M 3.1 * 14.8 11.0 135
HOLE-IN-ROCK 9150 -M 2.5 * 14.2 10.6 134
INDIAN CREEK 9425 -M 25.4 * 22.0 30.6 72
KELLEY R.S. 8180 9.1 10.7 85 17.3 24.5 71
STEEL CREEK PARK 10200 20.3 18.7 109 21.4 21.3 100
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Basin wide percent of average 107* 91
UPPER BEAR RIVER
BUG LAKE 7950 11.9 13.1 91 18.9 23.4 81
HAYDEN FORK 9212 6.9 9.1 76 23.4 26.3 89
KELLEY R.S. 8180 9.1 10.7 85 17.3 24.5 71
LILY LAKE 9156 11.3 7.7 147 19.6 22.2 88
MONTE CRISTO 8960 18.3 24.6 74 24.0 31.7 76
SALT RIVER SUMMIT 7760 6.6 6.7 99 15.3 22.5 68
TRIAL LAKE 9992 20.3 24.6 83 21.0 30.8 68
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Basin wide percent of average 87 77
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-M = Missing data
* = Data may not provide a valid measure of conditions.
Units = inches for the Current and Average Snow Water Equivalent and
Total Precipitation values
If the Basin wide percent of average 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 Average represents the snow water
equivalent found at selected SNOTEL sites in or near the basin compared to
the average 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.
Reference period for average conditions is 1971-2000.
Provisional data, subject to revision.
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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.