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Waterway mile markers. Update May 27, 2021 to Gulf Intracoastal Waterway - West from Mile Marker 289 to 667.
This data is provided by the U. S. Army Corps of Engineers (USACE), Institute for Water Resources (IWR), Navigations and Civil Works Decision Support (NDC). Also, includes Physical Characteristics of all Locks owned and operated by U. S. Army Corps of Engineers: built, maintained, location, site information, site characteristics