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USGS Water-Year Summary 2024
133032144491871 M-10A, Harmon Loop School, Dededo, Guam
Other aquifers
LOCATION - Lat 13°30'38.2", long -144°49'26.9" referenced to North American Datum of 1983, Guam County, GM, Hydrologic Unit 22010000, Located on south side of Route 27 and on the northwest part of the campus of Juan M. Guerrero Elementary School, Dededo. The well shelter is near the intersection of Route 27 and the entrance of the school parking lot.
REVISIONS HISTORY - Discrete water level on April 27, 2017 was approved with an incorrect date of April 26, 2017. Date was corrected on May 24, 2018 by hajeppes.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth undefined. Upper casing diameter undefined; top of first opening undefined, bottom of last opening undefined. Drilled basal water-table well, depth reported 288 ft, casing diameter 8 in.
DATUM - Land-surface datum is 227.79 ft above undefined vertical datum. Measuring point: top of steel casing, 228.62 ft above Local Mean Sea Level, Nov. 30, 1973 to Feb. 17, 2006; top of steel casing, west-southwest side, 228.99 ft above Guam Vertical Datum of 2004, Feb. 17, 2006 to Apr. 8, 2021; Top of stainless steel well cap bracket over casing, tab side (not lock side), 229.28 ft above Guam Vertical Datum of 2004, Aug. 16, 2021 to Aug. 16, 2021; Top of stainless steel well cap bracket over casing, tab side (not lock side), 229.26 ft above Guam Vertical Datum of 2004, Aug. 17, 2021 to present. Water level elevations are referenced to the Guam Vertical Datum of 2004 (GUVD04) beginning February 17, 2006.
PERIOD OF RECORD - Water level recorder, January 1974 to current year.
EXTREMES FOR PERIOD OF RECORD -
Since the datum of the water-level record was changed to GUVD04 in Feb. 2006:
Highest water level in continuous record: 5.24 feet above GUVD04, Sep. 21 and 22, 2013.
Lowest water level in continuous record: 2.88 feet above GUVD04, Nov. 14, 15, 16, and 17, 2018.
Extremes prior to Feb. 2006 might be different. The analyst in 2014 noted a low water-level value of 1.94 feet above mean sea level, Feb. 10-12, 1983.
