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 SUNDAY: MAY 10 , 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 7.4 9.1 81 24.1 25.1 96
COTTONWOOD CREEK 7670 24.9 16.6 150 38.5 33.1 116
GRAND TARGHEE 9260 55.5 -M * 42.3 -M *
GRANITE CREEK 6770 9.3 10.1 92 25.4 23.1 110
GRASSY LAKE 7265 30.1 29.8 101 42.7 42.0 102
GROS VENTRE SUMMIT 8750 13.1 11.6 113 19.3 15.9 121
GUNSIGHT PASS 9820 18.4 -M * 20.6 -M *
LEWIS LAKE DIVIDE 7850 37.0 31.8 116 41.3 42.7 97
PHILLIPS BENCH 8200 30.4 26.8 113 35.8 34.1 105
SALT RIVER SUMMIT 7760 11.1 7.6 146 20.4 22.3 91
SNAKE RIVER STATION 6920 10.8 8.7 124 28.5 26.3 108
SPRING CREEK DIVIDE 9000 32.8 26.9 122 32.6 31.0 105
THUMB DIVIDE 7980 20.2 12.1 167 26.8 22.8 118
TOGWOTEE PASS 9580 33.0 28.0 118 36.1 30.0 120
TWO OCEAN PLATEAU 9240 47.7 31.5 151 36.9 33.3 111
WILLOW CREEK 8380 34.9 28.1 124 48.3 39.1 124
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Basin wide percent of average 123 109
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9360 28.4 25.9 110 26.3 24.5 107
BLACK BEAR 8170 43.8 38.3 114 44.8 47.1 95
CANYON 7870 15.2 8.9 171 19.9 18.4 108
FISHER CREEK 9100 44.1 37.5 118 43.6 43.2 101
MADISON PLATEAU 7750 25.5 21.9 116 31.6 31.4 101
NORTHEAST ENTRANCE 7350 2.8 5.2 54 17.3 15.5 112
PARKER PEAK 9400 33.7 24.4 138 23.9 20.5 117
SYLVAN LAKE 8420 23.7 22.1 107 29.8 25.8 116
THUMB DIVIDE 7980 20.2 12.1 167 26.8 22.8 118
TWO OCEAN PLATEAU 9240 47.7 31.5 151 36.9 33.3 111
WHISKEY CREEK 6800 18.1 12.4 146 26.4 25.0 106
WHITE MILL 8700 30.6 25.9 118 30.7 32.3 95
WOLVERINE 7650 7.4 5.1 145 16.4 16.0 102
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Basin wide percent of average 126 105
WIND RIVER
BURROUGHS CREEK 8750 18.8 11.6 162 21.7 20.2 107
COLD SPRINGS 9630 7.8 4.4 177 15.7 14.9 105
DEER PARK 9700 15.1 16.4 92 23.0 28.0 82
HOBBS PARK 10100 18.2 17.4 105 20.7 18.1 114
LITTLE WARM 9370 12.9 9.1 142 19.6 17.8 110
SOUTH PASS 9040 14.3 16.0 89 20.1 23.8 84
ST. LAWRENCE ALT 8620 -M 4.9 * -M 13.1 *
TOGWOTEE PASS 9580 33.0 28.0 118 36.1 30.0 120
TOWNSEND CREEK 8700 9.5 7.2 132 17.3 16.5 105
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Basin wide percent of average 118 103
BIGHORN BASIN
BALD MTN. 9380 22.0 23.5 94 19.5 22.5 87
BEAR TRAP MEADOW 8200 3.4 1.6 212 12.3 11.8 104
BLACKWATER 9780 32.3 28.7 113 29.5 25.8 114
BONE SPRINGS DIV 9350 19.2 17.3 111 18.5 19.4 95
EVENING STAR 9200 34.9 33.2 105 38.9 31.1 125
GRAVE SPRINGS 8550 8.3 9.8 85 12.4 14.1 88
KIRWIN 9550 15.7 12.3 128 19.5 15.1 129
MARQUETTE 8760 8.3 10.1 82 12.8 14.9 86
MIDDLE POWDER 7760 11.2 12.7 88 13.2 16.8 79
OWL CREEK 8975 2.0 3.2 62 10.2 8.9 115
POWDER RIVER PASS 9480 13.3 9.3 143 19.2 16.9 114
SHELL CREEK 9580 19.8 16.8 118 20.0 17.9 112
SYLVAN LAKE 8420 23.7 22.1 107 29.8 25.8 116
SYLVAN ROAD 7120 3.4 5.3 64 24.4 21.3 115
TIMBER CREEK 7950 3.5 3.5 100 12.1 11.6 104
YOUNTS PEAK 8350 21.0 17.0 124 20.4 19.6 104
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Basin wide percent of average 107 107
SHOSHONE RIVER
BLACKWATER 9780 32.3 28.7 113 29.5 25.8 114
EVENING STAR 9200 34.9 33.2 105 38.9 31.1 125
KIRWIN 9550 15.7 12.3 128 19.5 15.1 129
MARQUETTE 8760 8.3 10.1 82 12.8 14.9 86
SYLVAN LAKE 8420 23.7 22.1 107 29.8 25.8 116
SYLVAN ROAD 7120 3.4 5.3 64 24.4 21.3 115
YOUNTS PEAK 8350 21.0 17.0 124 20.4 19.6 104
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Basin wide percent of average 108 114
POWDER-TONGUE
BEAR TRAP MEADOW 8200 3.4 1.6 212 12.3 11.8 104
BIG GOOSE 7990 10.3 10.3 100 16.2 14.1 115
BONE SPRINGS DIV 9350 19.2 17.3 111 18.5 19.4 95
BURGESS JUNCTION 7880 12.8 11.9 108 15.8 16.4 96
CLOUD PEAK RESERVOIR 9860 20.1 15.6 129 21.2 18.4 115
DOME LAKE 8880 11.8 11.8 100 19.5 18.0 108
GRAVE SPRINGS 8550 8.3 9.8 85 12.4 14.1 88
HANSEN SAWMILL 8360 1.7 3.7 46 13.1 11.8 111
MIDDLE POWDER 7760 11.2 12.7 88 13.2 16.8 79
POWDER RIVER PASS 9480 13.3 9.3 143 19.2 16.9 114
SUCKER CREEK 8880 15.5 11.6 134 21.0 18.6 113
TIE CREEK 6870 1.4 2.7 52 17.6 14.6 121
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Basin wide percent of average 109 105
BELLE FOURCHE
BLIND PARK 6890 -M 1.8 * 17.8 15.2 117
COLE CANYON 5910 1.2 1.8 67 15.1 10.5 144
NORTH RAPID CREEK 6130 .0 1.4 0 17.2 12.2 141
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Basin wide percent of average 37 132
UPPER N. PLATTE RIVER
COLUMBINE 9160 11.8 16.9 70 33.1 30.1 110
DIVIDE PEAK 8880 22.8 16.0 142 33.4 25.2 133
ELK RIVER 8700 6.1 10.9 56 25.8 23.9 108
JOE WRIGHT 10120 26.5 24.8 107 34.9 31.5 111
NORTH FRENCH CREEK 10130 40.1 34.3 117 39.7 31.1 128
OLD BATTLE 10000 40.9 37.0 111 47.3 41.2 115
SAGE CREEK BASIN 7850 2.4 9.3 26 19.5 14.6 134
SOUTH BRUSH CREEK 8440 4.9 8.6 57 22.8 21.2 108
TOWER 10500 50.7 52.4 97 50.8 46.8 109
WEBBER SPRINGS 9250 20.7 21.8 95 35.7 32.2 111
WILLOW CREEK PASS 9540 11.7 13.1 89 15.9 16.5 96
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Basin wide percent of average 97 114
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 24.5 26.1 94 28.3 28.3 100
CASPER MTN. 7900 11.8 14.5 81 17.6 20.9 84
DEADMAN HILL 10220 21.4 19.2 111 23.8 22.1 108
DEER PARK 9700 15.1 16.4 92 23.0 28.0 82
LAPRELE CREEK 8375 6.0 5.1 118 16.7 17.5 95
RENO HILL 8400 13.2 12.2 108 21.3 21.6 99
ROACH 9700 15.2 16.1 94 24.2 23.6 103
SAND LAKE 10050 36.6 36.7 100 36.8 30.8 119
SOUTH PASS 9040 14.3 16.0 89 20.1 23.8 84
WINDY PEAK 7900 5.4 3.0 180 15.0 14.5 103
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Basin wide percent of average 99 98
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 .0 2.3 0 23.0 19.3 119
DIVIDE PEAK 8880 22.8 16.0 142 33.4 25.2 133
OLD BATTLE 10000 40.9 37.0 111 47.3 41.2 115
SANDSTONE RS 8150 6.0 6.2 97 25.4 22.8 111
WHISKEY PARK 8950 29.4 29.0 101 40.8 35.2 116
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Basin wide percent of average 110 118
UPPER GREEN RIVER
BIG SANDY OPENING 9080 11.6 11.2 104 16.7 16.7 100
BLIND BULL SUM 8650 32.3 26.5 122 25.4 26.0 98
EAST RIM DIVIDE 7930 1.2 11.2 11 14.6 14.4 101
ELKHART PARK G.S. 9400 14.6 11.1 132 18.9 16.8 112
GROS VENTRE SUMMIT 8750 13.1 11.6 113 19.3 15.9 121
GUNSIGHT PASS 9820 18.4 -M * 20.6 -M *
KENDALL R.S. 7740 2.7 6.7 40 17.3 17.1 101
LOOMIS PARK 8240 11.2 11.9 94 22.3 20.6 108
NEW FORK LAKE 8340 6.5 6.0 108 14.1 14.0 101
SNIDER BASIN 8060 9.9 10.1 98 18.1 19.1 95
SPRING CREEK DIVIDE 9000 32.8 26.9 122 32.6 31.0 105
TRIPLE PEAK 8500 23.4 20.4 115 33.5 29.6 113
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Basin wide percent of average 104 105
LOWER GREEN RIVER
HAMS FORK 7840 1.3 3.3 39 15.9 15.4 103
HEWINTA 9519 .0 6.6 0 17.2 18.6 92
HICKERSON PARK 9145 .0 3.6 0 13.3 10.9 122
HOLE-IN-ROCK 9150 .3 3.0 10 12.8 10.4 123
INDIAN CREEK 9425 -M 26.1 * 27.4 30.4 90
KELLEY R.S. 8180 12.6 11.4 111 22.1 24.3 91
STEEL CREEK PARK 10200 16.2 18.9 86 21.0 21.1 100
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Basin wide percent of average 65 99
UPPER BEAR RIVER
BUG LAKE 7950 13.8 14.2 97 21.9 23.2 94
HAYDEN FORK 9212 3.6 9.9 36 27.3 26.1 105
KELLEY R.S. 8180 12.6 11.4 111 22.1 24.3 91
LILY LAKE 9156 5.2 8.5 61 21.5 22.0 98
MONTE CRISTO 8960 23.6 25.5 93 32.0 31.4 102
SALT RIVER SUMMIT 7760 11.1 7.6 146 20.4 22.3 91
TRIAL LAKE 9992 23.5 25.2 93 29.8 30.5 98
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Basin wide percent of average 91 97
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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.