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 SATURDAY: MAY 2 , 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 9.8 12.3 80 22.3 24.4 91
COTTONWOOD CREEK 7670 27.5 19.8 139 36.5 31.9 114
GRAND TARGHEE 9260 53.2 -M * 40.5 -M *
GRANITE CREEK 6770 11.9 12.8 93 23.7 22.4 106
GRASSY LAKE 7265 32.1 33.4 96 40.1 40.9 98
GROS VENTRE SUMMIT 8750 13.7 13.3 103 18.2 15.3 119
GUNSIGHT PASS 9820 16.9 -M * 19.3 -M *
LEWIS LAKE DIVIDE 7850 35.4 34.6 102 38.3 41.6 92
PHILLIPS BENCH 8200 30.8 29.4 105 34.2 33.1 103
SALT RIVER SUMMIT 7760 13.6 10.6 128 19.4 21.6 90
SNAKE RIVER STATION 6920 12.8 12.2 105 26.5 25.5 104
SPRING CREEK DIVIDE 9000 32.2 28.6 113 31.2 30.2 103
THUMB DIVIDE 7980 20.3 14.9 136 25.2 22.0 115
TOGWOTEE PASS 9580 31.4 27.9 113 34.4 29.0 119
TWO OCEAN PLATEAU 9240 44.4 31.8 140 34.3 32.1 107
WILLOW CREEK 8380 35.1 30.6 115 45.8 37.7 121
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Basin wide percent of average 112 105
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9360 26.6 25.9 103 24.5 23.5 104
BLACK BEAR 8170 40.3 39.9 101 41.3 45.8 90
CANYON 7870 14.6 11.3 129 18.5 17.7 105
FISHER CREEK 9100 40.0 37.8 106 40.3 41.9 96
MADISON PLATEAU 7750 25.5 24.2 105 29.3 30.4 96
NORTHEAST ENTRANCE 7350 5.8 7.1 82 15.9 14.8 107
PARKER PEAK 9400 32.0 24.5 131 22.4 19.5 115
SYLVAN LAKE 8420 21.9 23.8 92 27.7 24.7 112
THUMB DIVIDE 7980 20.3 14.9 136 25.2 22.0 115
TWO OCEAN PLATEAU 9240 44.4 31.8 140 34.3 32.1 107
WHISKEY CREEK 6800 18.7 15.2 123 24.4 24.2 101
WHITE MILL 8700 27.4 26.4 104 27.6 31.2 88
WOLVERINE 7650 9.5 7.2 132 15.0 15.2 99
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Basin wide percent of average 113 101
WIND RIVER
BURROUGHS CREEK 8750 18.3 13.6 135 20.4 19.3 106
COLD SPRINGS 9630 9.7 4.8 202 15.0 13.9 108
DEER PARK 9700 15.3 18.6 82 22.0 27.0 81
HOBBS PARK 10100 18.4 18.0 102 20.0 16.9 118
LITTLE WARM 9370 13.4 11.1 121 18.7 16.8 111
SOUTH PASS 9040 15.6 18.0 87 19.4 22.7 85
ST. LAWRENCE ALT 8620 8.0 6.1 131 14.3 12.1 118
TOGWOTEE PASS 9580 31.4 27.9 113 34.4 29.0 119
TOWNSEND CREEK 8700 11.5 9.1 126 17.1 15.5 110
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Basin wide percent of average 111 105
BIGHORN BASIN
BALD MTN. 9380 20.3 23.6 86 17.8 21.3 84
BEAR TRAP MEADOW 8200 5.8 2.5 232 11.8 10.9 108
BLACKWATER 9780 29.7 28.8 103 27.4 24.7 111
BONE SPRINGS DIV 9350 17.8 18.3 97 16.9 18.3 92
EVENING STAR 9200 32.4 33.3 97 35.8 29.9 120
GRAVE SPRINGS 8550 9.6 11.1 86 12.2 13.1 93
KIRWIN 9550 15.7 13.0 121 18.4 14.2 130
MARQUETTE 8760 9.0 11.3 80 12.5 13.7 91
MIDDLE POWDER 7760 12.2 14.3 85 12.5 15.8 79
OWL CREEK 8975 5.0 4.0 125 9.7 8.2 118
POWDER RIVER PASS 9480 12.6 10.7 118 18.1 15.8 115
SHELL CREEK 9580 18.4 16.8 110 18.3 16.8 109
SYLVAN LAKE 8420 21.9 23.8 92 27.7 24.7 112
SYLVAN ROAD 7120 6.8 8.1 84 22.3 20.5 109
TIMBER CREEK 7950 5.3 4.8 110 11.8 10.5 112
YOUNTS PEAK 8350 20.4 18.1 113 19.0 18.8 101
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Basin wide percent of average 100 105
SHOSHONE RIVER
BLACKWATER 9780 29.7 28.8 103 27.4 24.7 111
EVENING STAR 9200 32.4 33.3 97 35.8 29.9 120
KIRWIN 9550 15.7 13.0 121 18.4 14.2 130
MARQUETTE 8760 9.0 11.3 80 12.5 13.7 91
SYLVAN LAKE 8420 21.9 23.8 92 27.7 24.7 112
SYLVAN ROAD 7120 6.8 8.1 84 22.3 20.5 109
YOUNTS PEAK 8350 20.4 18.1 113 19.0 18.8 101
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Basin wide percent of average 100 111
POWDER-TONGUE
BEAR TRAP MEADOW 8200 5.8 2.5 232 11.8 10.9 108
BIG GOOSE 7990 10.8 11.6 93 15.6 12.9 121
BONE SPRINGS DIV 9350 17.8 18.3 97 16.9 18.3 92
BURGESS JUNCTION 7880 13.6 13.3 102 15.4 15.4 100
CLOUD PEAK RESERVOIR 9860 19.9 16.2 123 20.4 17.1 119
DOME LAKE 8880 12.8 13.5 95 18.5 16.8 110
GRAVE SPRINGS 8550 9.6 11.1 86 12.2 13.1 93
HANSEN SAWMILL 8360 4.1 4.9 84 12.7 11.0 115
MIDDLE POWDER 7760 12.2 14.3 85 12.5 15.8 79
POWDER RIVER PASS 9480 12.6 10.7 118 18.1 15.8 115
SUCKER CREEK 8880 15.9 13.1 121 20.3 17.4 117
TIE CREEK 6870 4.4 3.9 113 17.2 13.5 127
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Basin wide percent of average 105 108
BELLE FOURCHE
BLIND PARK 6890 -M 4.0 * 17.1 14.2 120
COLE CANYON 5910 5.0 5.0 100 14.7 9.5 155
NORTH RAPID CREEK 6130 2.4 3.8 63 16.7 11.4 146
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Basin wide percent of average 84 138
UPPER N. PLATTE RIVER
COLUMBINE 9160 18.3 20.9 88 31.4 29.2 108
DIVIDE PEAK 8880 26.4 19.3 137 32.2 24.3 133
ELK RIVER 8700 13.0 15.0 87 25.1 23.0 109
JOE WRIGHT 10120 26.3 25.1 105 33.3 30.1 111
NORTH FRENCH CREEK 10130 38.6 34.5 112 37.4 29.7 126
OLD BATTLE 10000 40.1 36.9 109 45.9 39.9 115
SAGE CREEK BASIN 7850 10.9 11.2 97 18.5 14.1 131
SOUTH BRUSH CREEK 8440 9.3 11.1 84 21.4 20.1 106
TOWER 10500 49.5 52.2 95 48.5 45.1 108
WEBBER SPRINGS 9250 24.3 25.1 97 34.8 31.1 112
WILLOW CREEK PASS 9540 13.2 14.2 93 15.1 15.7 96
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Basin wide percent of average 102 114
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 25.4 28.2 90 26.5 27.0 98
CASPER MTN. 7900 14.1 17.1 82 17.5 19.5 90
DEADMAN HILL 10220 21.7 19.7 110 22.7 21.0 108
DEER PARK 9700 15.3 18.6 82 22.0 27.0 81
LAPRELE CREEK 8375 8.7 7.1 123 16.5 16.5 100
RENO HILL 8400 15.6 14.7 106 21.1 20.2 104
ROACH 9700 17.9 18.5 97 23.3 22.4 104
SAND LAKE 10050 36.1 37.0 98 35.3 29.3 120
SOUTH PASS 9040 15.6 18.0 87 19.4 22.7 85
WINDY PEAK 7900 9.3 4.9 190 14.7 13.5 109
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Basin wide percent of average 98 100
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 3.2 4.6 70 21.8 18.6 117
DIVIDE PEAK 8880 26.4 19.3 137 32.2 24.3 133
OLD BATTLE 10000 40.1 36.9 109 45.9 39.9 115
SANDSTONE RS 8150 12.9 9.5 136 24.2 21.9 111
WHISKEY PARK 8950 31.3 30.5 103 39.2 33.8 116
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Basin wide percent of average 113 118
UPPER GREEN RIVER
BIG SANDY OPENING 9080 12.8 13.5 95 15.6 15.9 98
BLIND BULL SUM 8650 30.4 27.9 109 23.7 25.2 94
EAST RIM DIVIDE 7930 4.9 13.1 37 14.1 13.9 101
ELKHART PARK G.S. 9400 14.3 12.8 112 17.7 16.0 111
GROS VENTRE SUMMIT 8750 13.7 13.3 103 18.2 15.3 119
GUNSIGHT PASS 9820 16.9 -M * 19.3 -M *
KENDALL R.S. 7740 5.9 10.0 59 16.1 16.6 97
LOOMIS PARK 8240 13.1 14.3 92 21.4 19.9 108
NEW FORK LAKE 8340 8.6 8.4 102 13.1 13.4 98
SNIDER BASIN 8060 13.0 12.6 103 17.4 18.5 94
SPRING CREEK DIVIDE 9000 32.2 28.6 113 31.2 30.2 103
TRIPLE PEAK 8500 23.5 23.7 99 31.0 28.6 108
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Basin wide percent of average 97 103
LOWER GREEN RIVER
HAMS FORK 7840 6.2 6.0 103 14.9 14.7 101
HEWINTA 9519 5.3 9.3 57 16.9 17.8 95
HICKERSON PARK 9145 3.9 5.7 68 13.2 10.2 129
HOLE-IN-ROCK 9150 4.1 4.7 87 12.6 9.7 130
INDIAN CREEK 9425 -M 28.3 * 26.1 29.5 88
KELLEY R.S. 8180 14.6 14.1 104 21.2 23.6 90
STEEL CREEK PARK 10200 16.9 18.6 91 20.5 20.2 101
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Basin wide percent of average 87 100
UPPER BEAR RIVER
BUG LAKE 7950 17.5 18.0 97 21.0 22.4 94
HAYDEN FORK 9212 10.4 13.0 80 26.5 25.1 106
KELLEY R.S. 8180 14.6 14.1 104 21.2 23.6 90
LILY LAKE 9156 11.7 11.1 105 21.1 21.1 100
MONTE CRISTO 8960 26.5 28.3 94 31.3 30.3 103
SALT RIVER SUMMIT 7760 13.6 10.6 128 19.4 21.6 90
TRIAL LAKE 9992 25.2 26.5 95 28.2 29.4 96
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Basin wide percent of average 98 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.