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Water-Year Summary for Site 364935116065401

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Available Parameters
72019 Water level, depth LSD(Mean)  

Water year 2025: 2025-10-01 to 2026-09-30
 
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USGS Water-Year Summary 2025
364935116065401 Pluto 4
Volcanic Rocks
LOCATION - Lat 36°49'35.17", long 116°06'56.73" referenced to North American Datum of 1983, S15 T13S R52E M, Nye County, NV, Hydrologic Unit 160600142301,
REVISIONS HISTORY - Revisions: Groundwater levels above NGVD of 1929 and NAVD of 1988 from June 29, 1962, to July 1, 2025, at 16:40 UTC were revised on July 17, 2025, because land-surface datum was resurveyed. The previous land-surface datum was 4,151.7 ft above NGVD of 1929. The current/updated land-surface datum is 4,153.92 ft above NAVD of 1988.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 261 ft. Upper casing diameter 4.5 in; top of first opening 51 ft, bottom of last opening 261 ft.
DATUM - Land-surface datum is 4,153.92 ft above North American Vertical Datum of 1988. Measuring point: Top of 4 1/2-in casing, 0 ft above land-surface datum, Jan. 7, 2009 to Apr. 4, 2019; Red mark on top of 4 1/2-inch (OD), 4-inch (ID) casing, north side, 1.97 ft above land-surface datum, Apr. 3, 2019 to present. The NAVD of 1988 datum was determined by a level 2 GNSS survey (Reference Frame NAD_83 (2011) (EPOCH:2010.0000), GEOID 18) by USGS on June 3, 2025, and tied to the land-surface reference mark on the well casing. Prior to June 3, 2025, the land-surface datum was 4,151.7 ft above NGVD of 1929 as reported in a USGS report.
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.