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USGS Water-Year Summary 2024
370246116461901 ER-OV-05
Basin and Range basin-fill aquifers
Valley-Fill Deposits
Valley-Fill Deposits
LOCATION - Lat 37°02'45.91", long 116°46'22.13" referenced to North American Datum of 1983, in SE 1/4 SE 1/4 SE 1/4 sec.24, T.10 S., R.46 E., Nye County, NV, Hydrologic Unit 18090202,
REVISIONS HISTORY - Revisions: Groundwater levels above NGVD 1929 and NAVD 1988 from August 7, 2023, at 15:50 UTC to October 31, 2023, at 16:40 UTC were revised on November 29, 2023, because land-surface datum was resurveyed. The previous land-surface datum of 3,934.65 ft above NGVD 1929 was used from October 27, 1997, to July 19, 2023. The current/updated land-surface datum of 3,937.67 ft above NAVD 1988 is applied from July 20, 2023, to the present.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 200 ft. Upper casing diameter 2.5 in; top of first opening 136 ft, bottom of last opening 200 ft.
DATUM - Land-surface datum is 3,937.67 ft above North American Vertical Datum of 1988. Measuring point: Red mark on top of pvc casing, 1.3 ft above land-surface datum, Oct. 2, 1997 to present. The NAVD of 1988
datum was determined by a level 2 GNSS survey (Reference Frame
NAD_83 (2011) (EPOCH:2010.0000), GEOID18) by USGS on July 20, 2023, and tied to file mark on well casing. Prior to July 20, 2023, the land-surface datum was 3,934.65 ft above NGVD of 1929 as determined via level survey by
USGS on July 30, 1997.
COOPERATION - U.S. Department of Energy as part of the Nevada Environmental Management Operations Activity.
REMARKS - Periodic water-level measurements are made throughout the Nevada National Security Site (NNSS) and adjacent areas to aid in characterizing the local and regional groundwater flow systems. The following data have been collected and reviewed according to quality-assurance requirements specific to the NNSS.
