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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 2024
394008077005601 CL Ad 47
Piedmont and Blue Ridge crystalline-rock aquifers
Marburg Formation
Marburg Formation
LOCATION - Lat 39°40'08", long 77°00'56" referenced to North American Datum of 1927, Carroll County, MD, Hydrologic Unit 02070009, at Union Mills Homestead Park.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 310 ft. Upper casing diameter 6 in; top of first opening 35 ft, bottom of last opening 310 ft. Drilled, observation, water-table well, open hole below 35 ft.
DATUM - Land-surface datum is 540 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of casing, 2.97 ft above land-surface datum, Aug. 7, 1985 to May. 30, 2012; Top of recorder shelter platform, 3.03 ft above land-surface datum, May. 29, 2012 to Sep. 15, 2022; Top of bottom half of locking cap, 2.91 ft above land-surface datum, Sep. 15, 2022 to present.
PERIOD OF RECORD - August 1985 to current year.
GAGE - Water Years 2014 - 2023: Records good.
Water Year 2013 and prior years' accuracy statements can be found in Annual Water Data Reports.
Water-level measurements by U.S. Geological Survey personnel. Equipped with digital water-level recorder from May 2012 to current year.
Water-level measurements by U.S. Geological Survey personnel. Equipped with digital water-level recorder from May 2012 to current year.
REMARKS - Maryland Groundwater-Level Monitoring Network and Climate Response Network (CRN) observation well. U.S. Geological Survey satellite data-collection platform at well.
EXTREMES FOR PERIOD OF RECORD - Highest water level measured, 1.00 ft below land surface, February 25, 2003. Lowest measured, 4.95 ft below land surface, August 28, 2002.
WATER-QUALITY RECORDS
WELL CHARACTERISTICS - Depth 310 ft. Upper casing diameter 6 in; top of first opening 35 ft, bottom of last opening 310 ft. Drilled, observation, water-table well, open hole below 35 ft.
DATUM - Land-surface datum is 540 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of casing, 2.97 ft above land-surface datum, Aug. 7, 1985 to May. 30, 2012; Top of recorder shelter platform, 3.03 ft above land-surface datum, May. 29, 2012 to Sep. 15, 2022; Top of bottom half of locking cap, 2.91 ft above land-surface datum, Sep. 15, 2022 to present.
PERIOD OF RECORD - Intermittent water-quality records collected at this station since Water Year 2007.
