USGS Water-Year Summary 2024
412458078324601 EK 108
Mississippian aquifers
Mississippian, Lower
LOCATION - Lat 41°24'58.3", long 78°32'42.7" referenced to North American Datum of 1983, Elk County, PA, Hydrologic Unit 05010005, at St. Marys.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 340 ft. Upper casing diameter 12 in; top of first opening 40 ft, bottom of last opening 340 ft. Drilled observation well, cased to 40 ft, open hole.
DATUM - Land-surface datum is 1,741 ft above North American Vertical Datum of 1988. Measuring point: TOP OF INSTRUMENT SHELF; VALUE FROM LATER MP RECORD; CREATED FOR AQ MIGR; MOD DATE; 11/18/1974, 2.65 ft above land-surface datum, Oct. 22, 1974 to Jul. 25, 2001; top of instrument shelf, 2.65 ft above land-surface datum, Jul. 25, 2001 to present. Prior to July 25, 2001, top of casing, 2.30 ft above land-surface datum. Elevation of land surface is from Lidar.
PERIOD OF RECORD - October 1974 to current year.
GAGE - Data collection platform with 15-minute recording interval. Cellular telemetry at station.
COOPERATION - Site maintained in cooperation with the Pennsylvania Department of Environmental Protection and the U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD - Prior to October 2000, the extremes were based on extremes of the daily maximum depth below land-surface datum. Since that date, the extremes are based on the instantaneous depth below land-surface datum.
Highest water level, 1.95 ft below land-surface datum, Mar 4, 1991.
Lowest water level, 9.24 ft below land-surface datum, Jan 21, 1996.