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USGS Water-Year Summary 2024
07385700 BAYOU TECHE AT KEYSTONE LOCK AND DAM NEAR ST. MARTINVILLE, LA
LOCATION - Lat 30°04'15", long 91°49'45" referenced to North American Datum of 1927, in sec.17, T.11 S., R.6 E., St. Martin Parish, LA, Hydrologic Unit 08080102, on right bank of concrete lock and dam, 3.5 mi south of St. Martinville, and 11 mi upstream from Loreauville Canal.
DRAINAGE AREA - Indeterminate.
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1959 to current year. Daily gage heights since July 1913 in reports of Corps of Engineers.
GAGE -
Water-stage recorder and concrete dam.
Datum of gage is 2.12 feet below NAVD88 GEOID12b EPOCH 2010.0000.
Water-stage recorder for Bayou Teche at Keystone Lock lower gage (station 07385702) used as auxiliary gage for this station.
REMARKS - Records good. Bayou Teche heads in Bayou Courtableau at Port Barre. At high stages,
considerable flow bypasses station by way of Bayou Courtableau at weirs near Krotz Springs. There is controlled diversion to
or from Red River and Old River overflow area through Bayou des Glaises floodgates and to or from West Atchafalaya Floodway
through Big D'Arbonne Bayou Culvert and since April 1956 through Bayou Courtableau Drainage Structure. Since April 1952,
floodflow is diverted from Bayou Rapides (drainage area, 76.1 mi²) into Bayou Boeuf when stages of Red River make it
necessary to close gates at mouth of Bayou Rapides. Teche-Vermilion freshwater diversion operational during the year anytime
the flow in Bayou Courtableau does not bypass by way of Courtableau weirs near Krotz Springs. Dependent upon its gradient,
Bayou Fusilier interchanges flow between Bayou Teche and Vermilion River. Water from irrigation is diverted through Ruth
Canal (Station 07386700) into Vermilion River. Crest of dam raised from 8.0 ft to 9.47 ft in June 1957.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum gage height since July 1913, 24.30 ft, May 27, 1927; minimum gage height, 0.75 ft, July 18, 1918.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 4,430 ft³/s, Aug. 13, 2016, maximum gage height, 16.66 ft, Aug. 13, 2016; minimum discharge, no flow at times in 1962-64, 1972, 1988, and 2015.
