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USGS Water-Year Summary 2024
365705116424201 ER-OV-04a
Basin and Range basin-fill aquifers
Valley Fill
Valley Fill
LOCATION - Lat 36°57'05.07", long 116°42'45.19" referenced to North American Datum of 1983, in SE 1/4 SW 1/4 NW 1/4 sec.27, T.11 S., R.47 E., Nye County, NV, Hydrologic Unit 18090202,
REVISIONS HISTORY - Revisions: Groundwater levels above NGVD 1929 and NAVD 1988 from October 27, 1997, at 17:43 UTC to December 11, 2023, at 23:00 UTC were revised on December 20, 2023, because land-surface datum was resurveyed and the previous land-surface datum value was determined to be in error. The previous land-surface datum was 3,488.32 ft above NGVD 1929. The current/updated land-surface datum is 3,494.15 ft above NAVD 1988.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 151 ft. Upper casing diameter 2.5 in; top of first opening 89 ft, bottom of last opening 151 ft.
DATUM - Land-surface datum is 3,494.15 ft above North American Vertical Datum of 1988. Measuring point: Red mark on top of pvc casing, 2.3 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 25, 2023, and tied to the land-surface reference mark on the well casing. Prior to July 25, 2023, the land-surface datum was 3,488.32 ft above NGVD of 1929 as determined via level survey by
USGS in 1997. This reported land-surface datum value was found to be in error after a review of level notes was completed in 2023.
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.
