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USGS Water-Year Summary 2024
07381482 Old River Outflow Channel below Hydropower Channel
LOCATION - Lat 31°04'00.3", long 91°38'53.8" referenced to North American Datum of 1983, Concordia Parish, LA, Hydrologic Unit 08040301, located approx. 1 mile downstream of the confluence of the Old River Auxiliary Structure channel, Old River Low Sill Control Structure channel and the Sidney A. Murray Jr. Hydroelectric Plant channel; approx. 4 miles upstream of the confluence of the Red River, Atchafalaya River and the Outflow Channel.
DRAINAGE AREA - Indeterminate.
REVISIONS HISTORY -
Parameter codes 80154 (suspended sediment concentration, mg/L), 80155 (suspended sediment discharge, tons/day), and 70331 (suspended sediment sieve diameter percent <0.0625 mm) were revised in November 2018, as described in USGS SIR 2018-5147 (https://pubs.er.usgs.gov/publication/sir20185147) for the period Oct. 2, 1989 to February 3, 2015.
SURFACE-WATER RECORDS
PERIOD OF RECORD - February 28, 2009 to current year.
GAGE - Water-stage recorder and acoustic velocity meter. Datum of gage is 0.57 ft below NAVD 88.
REMARKS - Site affected by regulations from Old River Auxiliary Control Structure, Old River Lowsill Control Structure and and the Sidney A. Murray Jr. Hydroelectric Plant.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 730,000 ft³/s, May 20, 2011; maximum gage height, 49.82 ft, May 24, 2011; minimum discharge, 11,100 ft³/s, Nov. 16, 2022; minimum gage height, e3.52 ft, Aug. 29, 2012.
