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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
132624144452771 A-20, Ordot, Guam
Other aquifers
LOCATION - Lat 13°26'30.3", long -144°45'34.7" referenced to North American Datum of 1983, Guam County, GM, Hydrologic Unit 22010000, at Ordot-Chalan Pago Elementary School, about half a mile south of the intersection of Dero Drive and Guam Route 4/North Chalan Kanton Tasi in Ordot, Guam.
REVISIONS HISTORY - Elevation data was revised for the periods January 26 to May 7, 2024 and October 22, 2024 to January 8, 2025 on March 18, 2025.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 120 ft. Upper casing diameter undefined; top of first opening undefined, bottom of last opening undefined. Drilled water-table well, depth reported 116 ft (2017), inner casing diameter 4 in.
DATUM - Land-surface datum is 140.42 ft above undefined vertical datum. Measuring point: top of steel casing, 141.74 ft above Local Mean Sea Level, Jan. 31, 1975 to May 29, 2008; top of steel casing, south-southwest side, painted blue, 141.71 ft above Guam Vertical Datum of 2004, May 29, 2008 to present; Top of PVC casing, black ink triangle on non-locking tab side, east side of casing, 141.57 ft above Guam Vertical Datum of 2004, Aug. 16, 2021 to present. Water level elevations are referenced to the Guam Vertical Datum of 2004 (GUVD04) beginning June 2, 2008.
PERIOD OF RECORD - January 1974 to current year.
EXTREMES FOR PERIOD OF RECORD - Highest recorded water level, 62.60 feet above mean sea level, September 14, 2004; lowest recorded water level, 32.87 feet above mean sea level, intermittent readings July 11-13, 2009.
