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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2025
434258103504201 4S 2E11DBBB (Hourglass Cave Lake)
LOCATION - Lat 43°42'58.30", long 103°50'42.39" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 NW 1/4 sec.11, T.4 S., R.2 E., Custer County, SD, Hydrologic Unit 10120107,
SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct. 2015 to current year, continuous water level record Mar. 2018 to current year.
GAGE - Submersible unvented transducer, 60 minute recording interval.
COOPERATION - Water level record is provided by National Park Service, Jewel Cave National Monument.
REMARKS - Water level in feet above sea level of subterranean lake surface. Water level corrected to local barometric pressure.
EXTREMES FOR PERIOD OF RECORD - Highest water level, 4688.9 ft, Apr. 29, 2016. Lowest water level, 4684.3 ft, May 7, 2018.
