USGS Water-Year Summary 2021
07019130 MERAMEC RIVER AT VALLEY PARK, MO
LOCATION - Lat 38°32'47.8", long 90°29'06.1" referenced to North American Datum of 1983, in T.44 N., R.5 E., St. Louis County, MO, Hydrologic Unit 07140102, 0.5 mi north of I-44, 0.7 mile downstream of Highway 141 at river access on River Drive and at river mile 21.4.
DRAINAGE AREA - 3,850 mi².
PERIOD OF RECORD - Dec 17, 2002 to current year.
GAGE - Water-stage recorder. Datum of gage is 391.22 ft above North American Vertical Datum of 1988. Prior to Dec 17, 2002, wire-weight readings taken from Hwy 141, 2,860 ft upstream, at a datum 1.38 ft lower than present datum.