LNM08G-603E3B
Received 23 Sept 2026, 00:00 UTC
Warning text
NEW ORLEANS PORT ARTHUR
General / MSIB
--- MSIB 19-26: Calcasieu Lock GIWW Navigational Considerations --- Due to a collision with the Black Bayou Bridge causing significant structural damage, and several documented near-miss situations at the Grand Lake Bridge investigated by MSU Lake Charles, this Marine Safety Information Bulletin (MSIB) brings heightened awareness to all commercial vessels with anticipated voyages in the GIWW east of the Calcasieu Locks, specifically between Miles 229.0 and 239.0, WHL. Mariners are advised that this waterway features a narrow channel, two swing bridges, and the Calcasieu Lock, which is currently undergoing maintenance and is closed to marine traffic from 7:00 a.m. to 7:00 p.m., Monday through Friday, through September 2026. These characteristics may present navigational challenges for transiting vessels and tows. Furthermore, mariners are advised that contact with the fendering systems of the Grand Lake Bridge should be avoided at all costs. Damage to these fenders could result in enforcement action by U.S. Coast Guard MSU Lake Charles. For all commercial vessels transiting this area, consideration should be given to voyage planning, navigational assessments, posting suitable lookouts, and maintaining a safe speed to allow for timely and effective maneuvers. These considerations are not exhaustive and do not supersede navigation rules, sound mariner judgment, or good seamanship. Compliance with a vessel’s Towing Safety Management System (TSMS), where applicable, remains essential. All commercial vessel operators are strongly encouraged to share this MSIB with their vessel crews during voyage planning for transits through this area. For questions about this MSIB, mariners can contact the U.S. Coast Guard MSU Lake Charles Waterways Department at: [email protected].
USCG Heartland (Gulf) District Local Notice to Mariners 45/2026