The S-197 structure is located upstream of the mouth of the C-111 canal, about three miles from the shore of Manatee Bay, and 750-ft east of US 1 in Miami-Dade County. The S-197 structure is a four-barrel, cast-in-place concrete box culvert with vertical slide gates. The gates were manually operated by field station staff. Real-time stage data is available through telemetry. S-197 was originally built in 1969 by the Corps of Engineers (COE) with three gates. In 1988, 10 additional culverts were constructed to increase total structure capacity to 2400 cfs. In 2012, the structure was replaced with a four-barrel box culvert. The design capacity of the replaced structure remains at 2400 cfs. The gate structures are now automated through provision of a new control and generator building, new SCADA system, removing existing upstream and downstream stilling wells that were located on the canal bank, and installing new stilling wells mounted on a galvanized steel platform with concrete piles.