USGS Water-Year Summary 2020
07017200 BIG RIVER AT IRONDALE, MO
LOCATION - Lat 37°49'48.0", long 90°41'27.2" referenced to North American Datum of 1983, in SE 1/4 SW 1/4 sec.15, T.36 N., R.3 E., Washington County, MO, Hydrologic Unit 07140104, on left downstream wing wall of bridge on State Highway U, 0.2 mi upstream from Mill Creek, and 0.8 mi west of Irondale.
DRAINAGE AREA - 175 mi².
PERIOD OF RECORD -
Jul 1965 to current year.
Water-stage recorder and crest-stage gage. Datum of gage is 753.28 ft above National Geodetic Vertical Datum of 1929 (Missouri State Highway and Transportation Commission bench mark).