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 8 , 2009
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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 8.2 10.0 82 24.0 24.9 96
COTTONWOOD CREEK 7670 26.3 17.5 150 38.5 32.8 117
GRAND TARGHEE 9260 55.7 -M * 42.3 -M *
GRANITE CREEK 6770 10.3 10.8 95 25.4 22.9 111
GRASSY LAKE 7265 30.9 30.8 100 42.5 41.8 102
GROS VENTRE SUMMIT 8750 13.7 12.1 113 19.2 15.7 122
GUNSIGHT PASS 9820 18.4 -M * 20.6 -M *
LEWIS LAKE DIVIDE 7850 37.3 32.6 114 41.3 42.4 97
PHILLIPS BENCH 8200 31.0 27.6 112 35.8 33.8 106
SALT RIVER SUMMIT 7760 12.0 8.4 143 20.4 22.1 92
SNAKE RIVER STATION 6920 11.2 9.6 117 28.6 26.1 110
SPRING CREEK DIVIDE 9000 33.3 27.4 122 32.6 30.8 106
THUMB DIVIDE 7980 20.6 12.9 160 26.8 22.6 119
TOGWOTEE PASS 9580 33.0 28.1 117 36.1 29.8 121
TWO OCEAN PLATEAU 9240 47.4 31.6 150 37.0 33.0 112
WILLOW CREEK 8380 35.6 28.8 124 48.3 38.8 124
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Basin wide percent of average 122 109
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9360 28.2 25.9 109 26.2 24.2 108
BLACK BEAR 8170 44.1 38.8 114 44.8 46.8 96
CANYON 7870 15.1 9.5 159 19.7 18.2 108
FISHER CREEK 9100 43.8 37.7 116 42.9 42.9 100
MADISON PLATEAU 7750 25.5 22.4 114 31.6 31.1 102
NORTHEAST ENTRANCE 7350 3.5 5.6 62 17.3 15.3 113
PARKER PEAK 9400 33.9 24.5 138 23.8 20.2 118
SYLVAN LAKE 8420 23.9 22.6 106 29.9 25.5 117
THUMB DIVIDE 7980 20.6 12.9 160 26.8 22.6 119
TWO OCEAN PLATEAU 9240 47.4 31.6 150 37.0 33.0 112
WHISKEY CREEK 6800 18.5 13.1 141 26.4 24.8 106
WHITE MILL 8700 30.6 26.0 118 30.6 32.0 96
WOLVERINE 7650 8.1 5.7 142 16.3 15.8 103
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Basin wide percent of average 124 106
WIND RIVER
BURROUGHS CREEK 8750 18.9 12.0 158 21.6 20.0 108
COLD SPRINGS 9630 8.3 4.6 180 15.4 14.6 105
DEER PARK 9700 15.1 16.8 90 23.0 27.7 83
HOBBS PARK 10100 18.2 17.5 104 20.7 17.8 116
LITTLE WARM 9370 13.1 9.6 136 19.6 17.5 112
SOUTH PASS 9040 14.4 16.6 87 20.1 23.5 86
ST. LAWRENCE ALT 8620 5.5 5.2 106 14.6 12.8 114
TOGWOTEE PASS 9580 33.0 28.1 117 36.1 29.8 121
TOWNSEND CREEK 8700 9.8 7.6 129 17.3 16.3 106
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Basin wide percent of average 116 105
BIGHORN BASIN
BALD MTN. 9380 21.5 23.5 91 19.0 22.2 86
BEAR TRAP MEADOW 8200 4.2 1.7 247 12.2 11.6 105
BLACKWATER 9780 32.3 28.7 113 29.5 25.5 116
BONE SPRINGS DIV 9350 18.9 17.5 108 18.0 19.2 94
EVENING STAR 9200 34.9 33.3 105 38.7 30.8 126
GRAVE SPRINGS 8550 8.5 9.8 87 12.4 13.9 89
KIRWIN 9550 15.8 12.5 126 19.3 14.9 130
MARQUETTE 8760 8.4 10.3 82 12.7 14.6 87
MIDDLE POWDER 7760 10.9 13.1 83 12.9 16.5 78
OWL CREEK 8975 2.6 3.4 76 9.8 8.8 111
POWDER RIVER PASS 9480 13.0 9.5 137 19.0 16.6 114
SHELL CREEK 9580 19.4 16.8 115 19.6 17.6 111
SYLVAN LAKE 8420 23.9 22.6 106 29.9 25.5 117
SYLVAN ROAD 7120 4.9 6.0 82 24.5 21.1 116
TIMBER CREEK 7950 3.8 3.9 97 11.9 11.3 105
YOUNTS PEAK 8350 21.3 17.5 122 20.4 19.4 105
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Basin wide percent of average 106 107
SHOSHONE RIVER
BLACKWATER 9780 32.3 28.7 113 29.5 25.5 116
EVENING STAR 9200 34.9 33.3 105 38.7 30.8 126
KIRWIN 9550 15.8 12.5 126 19.3 14.9 130
MARQUETTE 8760 8.4 10.3 82 12.7 14.6 87
SYLVAN LAKE 8420 23.9 22.6 106 29.9 25.5 117
SYLVAN ROAD 7120 4.9 6.0 82 24.5 21.1 116
YOUNTS PEAK 8350 21.3 17.5 122 20.4 19.4 105
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Basin wide percent of average 108 115
POWDER-TONGUE
BEAR TRAP MEADOW 8200 4.2 1.7 247 12.2 11.6 105
BIG GOOSE 7990 10.1 10.6 95 16.1 13.8 117
BONE SPRINGS DIV 9350 18.9 17.5 108 18.0 19.2 94
BURGESS JUNCTION 7880 12.7 12.2 104 15.7 16.1 98
CLOUD PEAK RESERVOIR 9860 19.7 15.7 125 21.2 18.1 117
DOME LAKE 8880 12.1 12.1 100 19.3 17.7 109
GRAVE SPRINGS 8550 8.5 9.8 87 12.4 13.9 89
HANSEN SAWMILL 8360 2.0 3.9 51 13.0 11.6 112
MIDDLE POWDER 7760 10.9 13.1 83 12.9 16.5 78
POWDER RIVER PASS 9480 13.0 9.5 137 19.0 16.6 114
SUCKER CREEK 8880 15.5 11.8 131 20.9 18.4 114
TIE CREEK 6870 1.8 2.8 64 17.5 14.3 122
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Basin wide percent of average 107 106
BELLE FOURCHE
BLIND PARK 6890 -M 2.7 * 17.5 14.9 117
COLE CANYON 5910 2.1 2.5 84 15.3 10.3 149
NORTH RAPID CREEK 6130 .0 1.9 0 17.1 12.0 142
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Basin wide percent of average 48 134
UPPER N. PLATTE RIVER
COLUMBINE 9160 13.5 18.1 75 32.9 29.9 110
DIVIDE PEAK 8880 24.1 17.0 142 33.4 25.0 134
ELK RIVER 8700 8.2 12.0 68 25.8 23.7 109
JOE WRIGHT 10120 26.9 25.0 108 34.8 31.1 112
NORTH FRENCH CREEK 10130 40.4 34.4 117 39.7 30.8 129
OLD BATTLE 10000 41.3 37.2 111 47.3 40.9 116
SAGE CREEK BASIN 7850 5.4 9.9 55 19.5 14.5 134
SOUTH BRUSH CREEK 8440 6.6 9.3 71 22.8 20.9 109
TOWER 10500 50.9 52.4 97 50.7 46.4 109
WEBBER SPRINGS 9250 22.5 22.8 99 35.7 32.0 112
WILLOW CREEK PASS 9540 12.5 13.5 93 15.8 16.3 97
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Basin wide percent of average 100 115
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 25.5 26.9 95 28.2 28.0 101
CASPER MTN. 7900 12.3 15.3 80 17.5 20.6 85
DEADMAN HILL 10220 21.9 19.5 112 23.7 21.8 109
DEER PARK 9700 15.1 16.8 90 23.0 27.7 83
LAPRELE CREEK 8375 7.1 5.6 127 16.7 17.3 97
RENO HILL 8400 13.5 12.9 105 21.3 21.3 100
ROACH 9700 16.3 16.9 96 24.2 23.3 104
SAND LAKE 10050 37.0 36.9 100 36.8 30.5 121
SOUTH PASS 9040 14.4 16.6 87 20.1 23.5 86
WINDY PEAK 7900 6.2 3.5 177 15.0 14.2 106
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Basin wide percent of average 99 99
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 .0 2.9 0 23.0 19.1 120
DIVIDE PEAK 8880 24.1 17.0 142 33.4 25.0 134
OLD BATTLE 10000 41.3 37.2 111 47.3 40.9 116
SANDSTONE RS 8150 8.4 7.0 120 25.4 22.6 112
WHISKEY PARK 8950 29.9 29.5 101 40.8 34.9 117
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Basin wide percent of average 111 119
UPPER GREEN RIVER
BIG SANDY OPENING 9080 12.6 11.9 106 16.7 16.5 101
BLIND BULL SUM 8650 32.5 26.9 121 25.3 25.8 98
EAST RIM DIVIDE 7930 2.5 11.8 21 14.6 14.3 102
ELKHART PARK G.S. 9400 15.1 11.6 130 18.9 16.6 114
GROS VENTRE SUMMIT 8750 13.7 12.1 113 19.2 15.7 122
GUNSIGHT PASS 9820 18.4 -M * 20.6 -M *
KENDALL R.S. 7740 3.8 7.6 50 17.3 17.0 102
LOOMIS PARK 8240 11.7 12.5 94 22.3 20.5 109
NEW FORK LAKE 8340 7.8 6.6 118 14.0 13.9 101
SNIDER BASIN 8060 10.8 10.8 100 18.1 18.9 96
SPRING CREEK DIVIDE 9000 33.3 27.4 122 32.6 30.8 106
TRIPLE PEAK 8500 24.0 21.4 112 33.5 29.4 114
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Basin wide percent of average 104 106
LOWER GREEN RIVER
HAMS FORK 7840 3.1 4.0 78 15.9 15.3 104
HEWINTA 9519 .0 7.3 0 17.3 18.4 94
HICKERSON PARK 9145 .0 4.1 0 13.4 10.7 125
HOLE-IN-ROCK 9150 .7 3.4 21 12.8 10.2 125
INDIAN CREEK 9425 -M 26.7 * 27.3 30.1 91
KELLEY R.S. 8180 14.0 12.2 115 22.2 24.1 92
STEEL CREEK PARK 10200 16.4 18.9 87 21.0 20.9 100
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Basin wide percent of average 69 100
UPPER BEAR RIVER
BUG LAKE 7950 14.9 15.2 98 22.0 23.0 96
HAYDEN FORK 9212 5.6 10.7 52 27.3 25.9 105
KELLEY R.S. 8180 14.0 12.2 115 22.2 24.1 92
LILY LAKE 9156 6.9 9.2 75 21.5 21.8 99
MONTE CRISTO 8960 24.9 26.3 95 31.9 31.2 102
SALT RIVER SUMMIT 7760 12.0 8.4 143 20.4 22.1 92
TRIAL LAKE 9992 24.9 25.7 97 29.8 30.3 98
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Basin wide percent of average 96 98
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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 1961-90.
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.