USGS Water-Year Summary 2020
06921720 BIG CREEK NEAR BLAIRSTOWN, MO
LOCATION - Lat 38°33'17.92", long 93°57'55.27" referenced to North American Datum of 1983, in sec.36, T.44 N., R.28 W., Henry County, MO, Hydrologic Unit 10290108, located on left downstream bridge abutment on County Road N about 1 mi east of Blairstown.
DRAINAGE AREA - 414 mi².
PERIOD OF RECORD - Aug 1960 to Sep 1974, May 2007 to current year. Aug 1960 to Sep 1974 published as "at Blairstown".
GAGE - Water stage-recorder and crest-stage gage. Datum of gage is 734.06 ft above National Geodetic Vertical Datum of 1929.
PERIOD OF RECORD - Oct 2008 to Sep 2014.