USGS Water-Year Summary 2021
07351500 Cypress Bayou near Keithville, LA
LOCATION - Lat 32°18'00", long 93°49'40" referenced to North American Datum of 1983, in SW 1/4 sec.8, T.15 N., R.14 W., Caddo Parish, LA, Hydrologic Unit 11140206, on downstream side of bridge on U.S. Highway 171, immediately downstream from Texas and Pacific Railroad bridge, 2.0 mi south of Keithville, and 6.0 mi upstream from mouth of Boggy Bayou.
DRAINAGE AREA - 66 mi².
- WSP 1211: Drainage area.
PERIOD OF RECORD - Sept. 26, 1938 to September 1957. October 1957 to September 1982 (annual maximum). Oct. 4, 1982, to current year.
GAGE - Water-stage recorder. Datum of gage is 162.63 ft above NAVD of 1988 (levels by Louisiana Dept. of Transportation and Development). Prior to Oct.
1, 2009 datum of gage was 162.13 ft above NGVD of 1929 (levels by Corps of Engineers).
EXTREMES OUTSIDE PERIOD OF RECORD - The flood of July 1933 reached a stage of 18.0 ft, from floodmark.