Water Resources Data System & State Climate Office

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: APRIL 17 , 2018 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 -M 12.5 * -M 21.5 * Black Bear 8170 44.4 36.8 121 44.7 39.3 114 Blind Bull Sum 8650 -M 23.9 * -M 20.0 * Cottonwood Creek 7670 -M 19.3 * -M 25.3 * East Rim Divide 7930 -M 9.7 * -M 12.1 * Grand Targhee 9260 -M 41.5 * -M 32.3 * Granite Creek 6770 -M 11.7 * -M 20.1 * Grassy Lake 7265 -M 31.6 * -M 36.9 * Gros Ventre Summit 8750 -M 13.1 * -M 13.5 * Gunsight Pass 9820 -M 13.4 * -M 14.6 * Lewis Lake Divide 7850 -M 30.2 * -M 36.4 * Phillips Bench 8200 -M 25.9 * -M 28.8 * Salt River Summit 7640 -M 10.6 * -M 17.1 * Snake River Station 6920 -M 12.1 * -M 23.2 * Spring Creek Divide 9000 -M 23.4 * -M 24.4 * Thumb Divide 7980 -M 14.4 * -M 19.3 * Togwotee Pass 9580 -M 23.3 * -M 25.2 * Two Ocean Plateau 9240 -M 27.6 * -M 28.1 * Willow Creek 8080 -M 26.7 * -M 34.7 * Younts Peak 8350 -M 14.9 * -M 16.4 * ----- ----- Basin Index (%) 121* 114* MADISON-GALLATIN Black Bear 8170 44.4 36.8 121 44.7 39.3 114 Canyon 7870 18.4 12.4 148 21.2 16.8 126 Madison Plateau 7750 -M 22.7 * -M 27.1 * West Yellowstone 6700 12.0 8.1 148 18.4 14.7 125 Whiskey Creek 6800 -M 14.9 * -M 20.9 * ----- ----- Basin Index (%) 131 119 YELLOWSTONE Beartooth Lake 9360 -M 22.8 * -M 20.4 * Burnt Mtn 5880 7.4 .0 * 16.1 13.7 118 Canyon 7870 18.4 12.4 148 21.2 16.8 126 Cole Creek 7850 16.4 15.9 103 -M 14.2 * Evening Star 9200 -M 25.0 * -M 28.3 * Fisher Creek 9100 -M 32.1 * -M 32.9 * Northeast Entrance 7350 -M 7.6 * -M 12.7 * Parker Peak 9400 -M 20.7 * -M 18.4 * Sylvan Lake 8420 -M 20.2 * -M 23.2 * Thumb Divide 7980 -M 14.4 * -M 19.3 * Two Ocean Plateau 9240 -M 27.6 * -M 28.1 * White Mill 8700 -M 23.6 * -M 24.6 * Wolverine 7650 23.8 8.1 294 23.2 12.6 184 ----- ----- Basin Index (%) 181* 140* WIND RIVER Burroughs Creek 8750 -M -M * -M -M * Castle Creek 8400 -M -M * -M -M * Cold Springs 9630 9.7 5.4 180 10.9 10.6 103 Deer Park 9700 -M 16.0 * -M 21.0 * Hobbs Park 10100 -M 14.8 * -M 14.4 * Kirwin 9550 -M 10.0 * -M 12.2 * Little Warm 9370 -M 10.2 * -M 13.6 * Owl Creek 8975 -M 4.7 * -M 6.6 * South Pass 9040 -M 15.7 * -M 18.2 * St. Lawrence Alt 8620 -M 6.0 * -M 9.6 * Togwotee Pass 9580 -M 23.3 * -M 25.2 * Townsend Creek 8700 -M 9.8 * -M 12.9 * ----- ----- Basin Index (%) 180* 103* BIGHORN BASIN Bald Mtn. 9380 -M 19.5 * -M 17.9 * Bear Trap Meadow 8200 10.2 4.0 255 11.7 9.2 127 Bone Springs Div 9350 21.8 16.4 133 17.0 16.4 104 Grave Springs 8550 8.2 9.6 85 -M 11.3 * Kirwin 9550 -M 10.0 * -M 12.2 * Marquette 8760 -M -M * -M -M * Middle Powder 7760 10.2 12.5 82 -M 12.5 * Owl Creek 8975 -M 4.7 * -M 6.6 * Powder River Pass 9480 16.9 10.1 167 16.9 13.4 126 Shell Creek 9580 -M 15.3 * -M 14.5 * Timber Creek 7950 -M 5.1 * -M 8.1 * ----- ----- Basin Index (%) 128* 117* SHOSHONE RIVER Blackwater 9780 -M 23.7 * -M 21.5 * Evening Star 9200 -M 25.0 * -M 28.3 * Marquette 8760 -M -M * -M -M * Sylvan Road 7120 -M 10.2 * -M 17.2 * Younts Peak 8350 -M 14.9 * -M 16.4 * ----- ----- Basin Index (%) * * POWDER RIVER Bear Trap Meadow 8200 10.2 4.0 255 11.7 9.2 127 Cloud Peak Reservoir 9860 17.6 15.5 114 16.2 14.4 112 Grave Springs 8550 8.2 9.6 85 -M 11.3 * Hansen Sawmill 8360 9.8 5.4 181 11.9 9.3 128 Middle Powder 7760 10.2 12.5 82 -M 12.5 * Powder River Pass 9480 16.9 10.1 167 16.9 13.4 126 Soldier Park 8720 8.5 -M * 11.7 -M * ----- ----- Basin Index (%) 128 122 TONGUE RIVER Big Goose 7990 9.3 9.6 97 10.4 12.2 85 Bone Springs Div 9350 21.8 16.4 133 17.0 16.4 104 Burgess Junction 7880 -M 12.2 * -M 13.1 * Dome Lake 8880 16.6 11.9 139 14.1 14.5 97 Little Goose 8870 -M -M * -M -M * Sucker Creek 8880 -M 12.7 * -M 15.4 * Tie Creek 6870 5.3 4.5 118 10.8 12.4 87 ----- ----- Basin Index (%) 125 94 BELLE FOURCHE Cole Canyon 5910 7.5 2.6 288 12.0 10.1 119 ----- ----- Basin Index (%) 288 119 CHEYENNE RIVER BASIN Blind Park 6890 -M 4.6 * -M 12.5 * North Rapid Creek 6130 -M 4.8 * -M 10.5 * ----- ----- Basin Index (%) * * UPPER N. PLATTE Arapaho Ridge 10960 22.8 21.5 106 22.6 23.9 95 Blackhall Mtn 9820 -M -M * -M -M * Columbine 9160 24.7 21.2 117 27.9 26.6 105 Divide Peak 8880 -M 19.6 * -M 22.4 * Joe Wright 10120 -M 22.1 * -M 27.2 * Laprele Creek 8375 -M 8.8 * -M 13.3 * Med Bow 10500 -M -M * -M -M * North French Creek 10130 -M 32.0 * -M 28.0 * Never Summer 10280 -M 20.6 * -M -M * Old Battle 10000 -M 32.3 * -M 36.4 * Rawah 9020 -M 9.2 * -M 15.3 * Sage Creek Basin 7850 -M 7.6 * -M 15.0 * Sand Lake 10050 30.2 30.4 99 25.6 26.2 98 South Brush Creek 8440 -M 10.3 * -M 16.1 * Tower 10500 42.7 47.5 90 -M 41.4 * Webber Springs 9250 -M 22.8 * -M 27.9 * Willow Creek Pass 9540 14.4 12.7 113 15.6 14.1 111 Zirkel 9340 -M 23.2 * -M 29.5 * ----- ----- Basin Index (%) 101* 101* SWEETWATER Deer Park 9700 -M 16.0 * -M 21.0 * Larsen Creek 9000 -M 10.6 * -M -M * South Pass 9040 -M 15.7 * -M 18.2 * ----- ----- Basin Index (%) * * LOWER N. PLATTE Casper Mtn. 7900 -M 14.4 * -M 16.1 * Laprele Creek 8375 -M 8.8 * -M 13.3 * Reno Hill 8400 -M 14.1 * -M 16.6 * Windy Peak 7900 6.5 7.1 92 9.7 11.3 86 ----- ----- Basin Index (%) 92* 86* LARAMIE RIVER Brooklyn Lake 10240 -M 22.1 * -M 22.3 * Cinnabar Park 9574 -M 20.7 * -M 25.0 * Crow Creek 8330 3.0 2.3 130 12.1 11.7 103 Deadman Hill 10220 22.4 16.5 136 21.3 18.4 116 Rawah 9020 -M 9.2 * -M 15.3 * Roach 9700 -M 16.5 * -M 20.2 * ----- ----- Basin Index (%) 135* 111* S. PLATTE Black Mountain 8920 10.3 -M * 14.4 -M * Crow Creek 8330 3.0 2.3 130 12.1 11.7 103 Deadman Hill 10220 22.4 16.5 136 21.3 18.4 116 ----- ----- Basin Index (%) 135 111 LITTLE SNAKE RIVER Battle Mountain 7440 -M 5.8 * -M 15.7 * Divide Peak 8880 -M 19.6 * -M 22.4 * Elk River 8700 -M 16.5 * -M 20.9 * Little Snake River 8915 -M 25.3 * -M 30.9 * Old Battle 10000 -M 32.3 * -M 36.4 * Sage Creek Basin 7850 -M 7.6 * -M 15.0 * Sandstone RS 8150 -M 11.1 * -M 19.1 * Whiskey Park 8950 -M 26.5 * -M 29.1 * ----- ----- Basin Index (%) * * UPPER GREEN RIVER Big Sandy Opening 9080 -M 12.8 * -M 13.8 * Blind Bull Sum 8650 -M 23.9 * -M 20.0 * East Rim Divide 7930 -M 9.7 * -M 12.1 * Elkhart Park G.S. 9400 -M 12.0 * -M 13.8 * Gros Ventre Summit 8750 -M 13.1 * -M 13.5 * Gunsight Pass 9820 -M 13.4 * -M 14.6 * Kendall R.S. 7740 13.6 9.3 146 16.7 14.6 114 Loomis Park 8240 -M 13.3 * -M 17.7 * New Fork Lake 8340 -M 9.3 * -M 11.1 * Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 10.5 11.3 93 15.7 14.6 108 Spring Creek Divide 9000 -M 23.4 * -M 24.4 * Triple Peak 8500 -M 19.3 * -M 26.0 * ----- ----- Basin Index (%) 117* 111* LOWER GREEN RIVER Blacks Fork Jct 8869 -M -M * -M -M * Buck Pasture 9632 -M -M * -M -M * EF Blacks Fork GS 9360 -M -M * -M -M * Hams Fork 7840 7.7 7.8 99 10.4 11.8 88 Hewinta 9500 6.2 9.1 68 12.2 14.6 84 Hickerson Park 9122 -M 6.1 * -M 10.8 * Hole-in-Rock 9168 -M 6.4 * -M 10.3 * Indian Creek 9425 -M 23.5 * -M 23.2 * Kelley R.S. 8180 -M 13.4 * -M 18.6 * Spirit Lk 10235 -M -M * -M -M * Steel Creek Park 10158 -M 16.1 * -M 17.4 * ----- ----- Basin Index (%) 82* 86* UPPER BEAR RIVER Bear River RS 8777 -M -M * -M -M * Bug Lake 7987 -M 18.4 * -M 20.0 * Burts Miller Ranch 8000 .0 -M * 6.6 -M * Chalk Creek #1 9171 15.1 24.9 61 17.7 26.3 67 Hayden Fork 9130 -M 13.0 * -M 22.0 * Kelley R.S. 8180 -M 13.4 * -M 18.6 * Lily Lake 9133 9.0 11.7 77 12.2 17.9 68 Monte Cristo 8932 23.9 27.6 87 24.0 26.9 89 Salt River Summit 7640 -M 10.6 * -M 17.1 * ----- ----- Basin Index (%) 75* 76* ----------------------------------------------------------------------------- -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. ---------------------------------------------------------------------------- -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.