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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
291442081384201 M-0828 SILVER GLEN SPRINGS WELL NR ASTOR, FL
LOCATION - Lat 29°14'46.69", long 81°38'38.35" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 SE 1/4 sec.25, T.14 S., R.26 E., Marion County, FL, Hydrologic Unit 03080101, in the woods 100' north of spring pool, 0.5 mi upstream from Lake George, and 9.1 mi northwest of Astor, FL. Owner: St. Johns Water Management District
REVISIONS HISTORY -
Groundwater levels on June 6, 2017 were revised due to an incorrect reference datum, on April 12, 2021. Originally water level was recorded as referenced to NAVD88 when it was referenced to NGVD29.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 96 ft. Upper casing diameter 4 in; top of first opening 80 ft, bottom of last opening 96 ft. Drilled, observation, artesian well, cased to 80 ft.
DATUM - Land-surface datum is 18.68 ft above National Geodetic Vertical Datum of 1929. Measuring point: Black mark on NW top of 4 in pipe 3 ft above land-surface datum, 21.68 ft above National Geodetic Vertical Datum of 1929, Mar. 13, 2017 to present.
PERIOD OF RECORD - March 2017 to current year.
GAGE - Water-stage recorder and data-collection platform--15-minute interval.
COOPERATION - This gage is monitored in cooperation with the St. Johns Water Management District.
EXTREMES FOR PERIOD OF RECORD - Highest water level, 5.59 ft above NGVD of 1929, Nov. 10, 2022; lowest 0.88 ft above NGVD of 1929, May 13, 2017.
