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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
415104121232901 46.00N/05.00E-03P01M
Pacific Northwest volcanic-rock aquifers
Basalt
Basalt
LOCATION - Lat 41°51'04.5", long 121°23'33.7" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 SW 1/4 sec.03, T.4600 N., R.500 E., Modoc County, CA, Hydrologic Unit 18010204, within Lava Beds National Monument at Prisoner's Rock. The well is located approximately 1/4 mile west of Road 120 on an unnamed dirt road just to the north of Prisoner's Rock. From this unnamed dirt road, the well is 235 feet to the south.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 80 ft. Upper casing diameter 4.5 in; top of first opening 47.5 ft, bottom of last opening 88.8 ft. Well unused.
DATUM - Land-surface datum is 4,057.7 ft above National Geodetic Vertical Datum of 1929. Measuring point: Transfer MP created for migration, 0 ft above land-surface datum, May. 8, 1966 to Jun. 28, 2000; 'TOP EDGE OF CASING ON SW SIDE THROUGH CRACK BETWEEN LD AND TOP OF CASING', 1.75 ft above land-surface datum, Jun. 27, 2000 to Oct. 31, 2000; Top of plate on casing top, 1.75 ft above land-surface datum, Oct. 31, 2000 to present.
PERIOD OF RECORD - October 2000 to current year.
REMARKS - State well identification is unavailable.
EXTREMES FOR PERIOD OF RECORD - Highest water level, 27.83 ft below land-surface datum, Nov. 4, 2000; lowest water level, 57.94 ft below land-surface datum, May 27-31, June 1, 2, 2022.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - BAROMETRIC PRESSURE: October 2016 to current year.
INSTRUMENTATION - BAROMETRIC PRESSURE: Collection, computation, and publication of barometric pressure data do not necessarily conform to standards used by the National Weather Service. Records published in this report are for general scientific use.
EXTREMES FOR PERIOD OF RECORD - BAROMETRIC PRESSURE: Maximum, 672 mmHg Jan. 27, 28, Oct. 23, Dec. 7, 2017; minimum, 635 mmHg Nov. 27, 2019.
REMARKS - Meteorological monitor.
