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 TUESDAY: MAY 4 , 1999
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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 15.4 9.5 162 29.7 25.5 117
COTTONWOOD CREEK 7600 22.5 18.9 120 33.3 28.5 117
GRANITE CREEK 6770 16.4 11.9 139 26.9 27.2 99
GRASSY LAKE 7265 39.2 32.5 121 47.2 42.4 112
GROS VENTRE SUMMIT 8775 16.4 13.1 126 18.7 18.4 102
LEWIS LAKE DIVIDE 7860 39.3 33.4 118 44.0 43.2 103
PHILLIPS BENCH 8200 35.3 28.7 123 36.2 34.0 107
SALT RIVER SUMMIT 7600 13.6 8.5 161 21.4 19.5 110
SNAKE RIVER STATION 6920 13.5 15.5 88 28.9 29.7 97
SPRING CREEK DIVIDE 9000 36.8 28.9 128 34.3 31.2 110
THUMB DIVIDE 7980 19.2 14.4 134 25.5 23.9 107
TOGWOTEE PASS 9580 -M 27.9 * 33.0 32.3 103
TWO OCEAN PLATEAU 9360 40.3 27.4 147 35.3 35.2 101
WILLOW CREEK 8450 31.2 31.2 101 45.3 36.7 124
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Basin wide percent of average 124 108
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9275 28.2 25.9 109 27.4 21.7 127
BLACK BEAR 7950 -M 39.3 * 51.3 46.9 110
CANYON 7940 14.6 10.0 146 21.2 16.7 128
FISHER CREEK 9100 -M 38.5 * 41.8 42.8 98
MADISON PLATEAU 7750 -M 22.9 * 36.3 30.4 120
NORTHEAST ENTRANCE 7350 4.8 5.3 91 16.4 14.2 115
PARKER PEAK 9400 26.7 23.5 114 -M 18.7 *
SYLVAN LAKE 8420 24.5 23.2 106 31.7 22.7 140
THUMB DIVIDE 7980 19.2 14.4 134 25.5 23.9 107
TWO OCEAN PLATEAU 9360 40.3 27.4 147 35.3 35.2 101
WHISKEY CREEK 6800 19.7 14.0 141 27.9 25.2 111
WHITE MILL 8700 30.4 26.2 117 28.5 33.0 87
WOLVERINE 7650 6.5 7.1 91 15.0 15.5 97
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Basin wide percent of average 122 110
WIND RIVER
BURROUGHS CREEK 8750 18.7 11.7 159 21.5 19.7 110
COLD SPRINGS 9630 19.4 6.0 324 -M 13.5 *
DEER PARK 9700 25.9 -M * 31.9 -M *
HOBBS PARK 10100 29.2 17.9 165 -M 17.7 *
LITTLE WARM 9620 -M 9.5 * 23.0 16.7 139
SOUTH PASS 9040 24.9 17.9 140 29.4 21.0 141
ST. LAWRENCE ALT 8620 14.1 4.8 294 20.7 12.9 161
TOGWOTEE PASS 9580 -M 27.9 * 33.0 32.3 103
TOWNSEND CREEK 8700 19.5 8.9 222 25.2 16.0 158
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Basin wide percent of average 188 129
BIGHORN BASIN
BALD MTN. 9375 21.9 24.2 91 21.9 21.4 103
BEAR TRAP MEADOW 7900 1.2 3.8 30 14.5 11.0 132
BLACKWATER 9780 35.0 25.7 137 28.9 21.0 138
BONE SPRINGS DIV 9350 19.9 18.2 110 21.4 18.5 116
EVENING STAR 9200 36.8 30.7 120 39.5 26.4 151
GRAVE SPRINGS 8550 10.7 11.5 94 16.9 12.9 132
KIRWIN 9550 16.5 11.5 145 19.4 13.6 142
MARQUETTE 8760 17.0 8.5 203 18.9 14.0 136
MIDDLE POWDER 7760 15.7 14.7 107 22.2 15.2 146
OWL CREEK 8975 10.1 2.9 349 12.2 8.5 146
POWDER RIVER PASS 9480 11.9 9.6 123 19.5 15.1 130
SHELL CREEK 9580 17.7 17.0 104 18.4 16.4 113
SYLVAN LAKE 8420 24.5 23.2 106 31.7 22.7 140
SYLVAN ROAD 8120 10.1 7.1 143 21.7 19.0 114
TIMBER CREEK 7950 10.1 5.3 191 15.5 10.5 150
YOUNTS PEAK 8350 21.4 17.9 121 21.4 19.7 109
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Basin wide percent of average 122 130
SHOSHONE RIVER
BLACKWATER 9780 35.0 25.7 137 28.9 21.0 138
EVENING STAR 9200 36.8 30.7 120 39.5 26.4 151
KIRWIN 9550 16.5 11.5 145 19.4 13.6 142
MARQUETTE 8760 17.0 8.5 203 18.9 14.0 136
SYLVAN LAKE 8420 24.5 23.2 106 31.7 22.7 140
SYLVAN ROAD 8120 10.1 7.1 143 21.7 19.0 114
YOUNTS PEAK 8350 21.4 17.9 121 21.4 19.7 109
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Basin wide percent of average 130 133
POWDER-TONGUE
BEAR TRAP MEADOW 7900 1.2 3.8 30 14.5 11.0 132
BIG GOOSE 7990 9.7 -M * 16.9 -M *
BONE SPRINGS DIV 9350 19.9 18.2 110 21.4 18.5 116
BURGESS JUNCTION 7880 10.2 13.0 79 15.6 14.9 106
CLOUD PEAK RESERVOIR 9860 23.9 17.4 137 23.4 17.7 133
DOME LAKE 8880 -M 14.0 * 16.5 16.9 99
GRAVE SPRINGS 8550 10.7 11.5 94 16.9 12.9 132
HANSEN SAWMILL 8760 5.5 6.3 88 15.4 10.6 145
MIDDLE POWDER 7760 15.7 14.7 107 22.2 15.2 146
POWDER RIVER PASS 9480 11.9 9.6 123 19.5 15.1 130
SUCKER CREEK 8880 13.6 13.1 104 19.2 16.9 114
TIE CREEK 6870 -M -M * -M 14.2 *
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Basin wide percent of average 105 124
BELLE FOURCHE
BLIND PARK 6890 .0 8.6 0 18.0 14.4 126
NORTH RAPID CREEK 6130 .5 -M * 16.5 -M *
WARREN PEAK 6520 3.8 8.6 45 13.2 10.6 125
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Basin wide percent of average 23 126
UPPER N. PLATTE RIVER
COLUMBINE 9400 16.7 20.4 82 27.9 28.4 99
DIVIDE PEAK 8800 21.5 17.9 121 30.7 27.7 111
ELK RIVER 8700 14.1 14.6 97 27.4 22.4 122
JOE WRIGHT 10120 23.2 24.5 95 31.4 30.9 102
NORTH FRENCH CREEK 10100 39.3 28.9 136 38.0 28.5 134
OLD BATTLE 10000 38.8 38.0 103 44.4 36.2 123
SOUTH BRUSH CREEK 8400 9.6 9.6 100 23.2 20.9 111
TOWER 10500 56.3 51.2 111 47.2 43.9 108
WEBBER SPRINGS 9200 21.9 24.9 88 32.5 31.0 105
WILLOW CREEK PASS 9540 15.6 13.0 121 15.0 15.7 95
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Basin wide percent of average 106 112
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 28.2 28.2 101 30.7 24.2 127
CASPER MTN. 7900 12.5 16.4 77 21.4 19.2 112
DEADMAN HILL 10220 21.7 19.0 115 23.2 21.5 108
DEER PARK 9700 25.9 -M * 31.9 -M *
LAPRELE CREEK 8320 .0 5.8 0 19.9 15.1 132
RENO HILL 8400 14.9 12.5 120 24.7 22.7 109
ROACH 9700 -M 17.7 * 25.4 26.4 97
SAND LAKE 10080 46.3 36.9 126 36.8 25.2 147
SOUTH PASS 9040 24.9 17.9 140 29.4 21.0 141
WINDY PEAK 7840 5.5 7.0 78 17.9 12.6 142
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Basin wide percent of average 108 123
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 1.7 3.8 43 22.0 18.9 118
DIVIDE PEAK 8800 21.5 17.9 121 30.7 27.7 111
OLD BATTLE 10000 38.8 38.0 103 44.4 36.2 123
SANDSTONE RS 8150 6.1 8.2 75 24.9 23.4 107
WHISKEY PARK 8950 31.5 28.7 110 36.4 34.5 106
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Basin wide percent of average 104 113
UPPER GREEN RIVER
BIG SANDY OPENING 9100 16.0 13.1 123 18.5 18.9 99
BLIND BULL SUM 8650 32.3 22.7 143 26.9 27.2 99
EAST RIM DIVIDE 7930 14.7 14.5 103 17.4 17.5 100
ELKHART PARK G.S. 9400 16.0 13.2 122 18.2 18.4 99
GROS VENTRE SUMMIT 8775 16.4 13.1 126 18.7 18.4 102
KENDALL R.S. 7740 11.5 8.5 137 19.2 17.9 108
LOOMIS PARK 8240 -M 14.4 * 23.9 21.7 111
NEW FORK LAKE 8340 12.0 8.5 142 15.1 16.7 91
SNIDER BASIN 8250 19.7 12.1 163 22.0 17.4 127
SPRING CREEK DIVIDE 9000 36.8 28.9 128 34.3 31.2 110
TRIPLE PEAK 8500 31.9 24.2 132 36.9 35.4 105
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Basin wide percent of average 131 105
LOWER GREEN RIVER
HAMS FORK 7840 10.0 4.5 221 17.4 15.5 113
HEWINTA 9500 13.0 4.3 310 18.4 16.7 111
HICKERSON PARK 9150 6.5 2.5 261 14.2 12.6 113
HOLE-IN-ROCK 9150 9.1 2.0 455 14.5 12.6 116
INDIAN CREEK 9425 37.5 28.2 134 32.7 29.5 111
KELLEY R.S. 8180 16.7 14.0 120 23.4 21.7 108
STEEL CREEK PARK 10100 20.9 18.5 113 22.2 16.5 135
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Basin wide percent of average 154 115
UPPER BEAR RIVER
BUG LAKE 7950 25.5 14.9 173 27.9 22.9 122
HAYDEN FORK 9400 14.1 5.5 262 25.9 23.4 111
KELLEY R.S. 8180 16.7 14.0 120 23.4 21.7 108
LILY LAKE 9050 13.9 8.1 171 23.4 18.4 127
MONTE CRISTO 8960 37.9 25.4 150 35.7 30.7 116
SALT RIVER SUMMIT 7600 13.6 8.5 161 21.4 19.5 110
TRIAL LAKE 9960 27.0 23.4 116 29.5 28.7 103
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Basin wide percent of average 150 114
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-M = Missing data
* = Data may not provide a valid measure of conditions.
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.