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Calcasieu Lock is located on the Gulf Intracoastal Waterway just north of Calcasieu Lake in Louisiana. Calcasieu Lock has three main purposes: facilitate navigation, provide flood relief during high flow events, and prevent saltwater intrusion into the Mermentau River Basin. During high flow events, the primary purpose of Calcasieu Lock is draining for flood relief. The upstream and downstream gates open to pass as much water as possible. When in draining mode, currents through the lock increase in strength and can cause eastbound traffic with smaller horsepower towboats to be unable to push upstream through the lock. This causes delays for the eastbound traffic. The US Army Corps of Engineers, New Orleans District (MVN), proposed a diversion channel to alleviate the amount of flow the lock must pass during these high flow events. In 2019, the US Army Engineer Research and Development Center Ship/Tow Simulator was used to perform a navigation study for the proposed diversion channel at Calcasieu Lock to assist MVN in verifying the proposed design. The final assessment of the diversion channel was accomplished through analysis of ship simulations completed by experienced pilots, discussions, track plots, run sheets, and final pilot surveys. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. ERDC/CHL TR-19-16 iii

Calcasieu Lock navigation study, Louisiana : Calcasieu Lock diversion channel ship simulation report