USGS Water-Year Summary 2023
471735114052701 18N20W25BDBC01
Glacial Colluvium
LOCATION - Lat 47°17'35", long 114°05'27" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 NW 1/4 sec.25, T.18 N., R.20 W., Lake County, MT, Hydrologic Unit 17010212,
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 14.55 ft. Upper casing diameter undefined; top of first opening undefined, bottom of last opening undefined.
DATUM - Land-surface datum is 3,045 ft above North American Vertical Datum of 1988. Measuring point: Top of PVC casing, 0.8 ft above land-surface datum, Mar. 21, 2014 to present.
PERIOD OF RECORD - May 2016 to current year. Prior to February 2017 published as 18N20W25BCAC01 Johnson MW11.
GAGE - Routine measurement with calibrated e-tape. Pressure transducer with data logger set to record every hour.
PERIOD OF DAILY RECORD - May 2016 to current year (seasonal records).
EXTREMES FOR PERIOD OF RECORD - Highest recorded instantaneous water level, 0.65 ft below land-surface datum, April 27, 2017; lowest instantaneous recorded, dry (greater than 14.53 ft below land-surface datum), May 4 to June 1, 2016.