USGS Water-Year Summary 2019
02233500 ECONLOCKHATCHEE RIVER NEAR CHULUOTA, FL
LOCATION - Lat 28°40'40", long 81°06'51" referenced to North American Datum of 1983, in SW 1/4 sec.10, T.21 S., R.32 E., Seminole County, FL, Hydrologic Unit 03080101, near right bank on downstream side of bridge on State Highway 13, 2.6 mi northeast of Chuluota, and 10 mi upstream from mouth.
DRAINAGE AREA - 241 mi².
PERIOD OF RECORD - April to September 1935 (miscellaneous discharge measurements only), October 1935 to current year. Monthly discharge only for October 1935, published in WSP 1304.
GAGE - Water-stage recorder and data-collection platform. Datum of gage is 2.14 ft above NGVD of 1929 (U.S. Army Corps of Engineers bench mark) and 0.84 ft above NAVD of 1988. Nov. 6, 1935, to May 17, 1939, and June 17, 1969, to July 21, 1971, nonrecording gage at same site and datum. Since Sept. 3, 1943, water-stage recorder for St. Johns River above Lake Harney near Geneva (station 02234000) used as auxiliary gage for this station.
COOPERATION - This gage is monitored in cooperation with the St. Johns River Water Management District.