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  • Warning Horn Below Table Rock Dam Not Operational

    The U.S. Army Corps of Engineers advises all individuals downstream of Table Rock Dam that the warning horn, which typically signals changes in water levels, is not operational. While the horn at the dam continues to function and will sound before any water level changes, those farther downstream may not hear it.

  • Single lane closure scheduled for Highway 177 across Norfork Dam

    – The U.S. Army Corps of Engineers is scheduling a single lane closure of Highway 177 across Norfork Dam starting at 6 a.m. March 26, 2025, and continuing through late July 2025, for routine maintenance.

  • USACE lifts small craft advisory for Arkansas River

    – The U.S. Army Corps of Engineers is lifting the small craft advisory for the Arkansas River. Small craft advisories are issued when flows reach 70,000 cubic feet per second.

  • MKARNS Nav Notice No. SWL 25-17 Lock 2 Tow Haulage Return to Service

    The tow haulage equipment at Lock No. 2 (NM 13.3) has been repaired and returned to service.

  • USACE issues small craft advisory for Arkansas River

    The U.S. Army Corps of Engineers is issuing a small craft advisory for the McClellan-Kerr Arkansas River Navigation System in Arkansas. Heavy rainfall in eastern Oklahoma and western Arkansas over the last 24 hours has resulted in Arkansas River flows exceeding 70,000 cubic feet per second at Trimble Lock and Dam.

  • MKARNS Nav Notice No. SWL 25-16 Lock 2 Tow Haulage Out of Service

    The tow haulage equipment at Lock No. 2 (NM 13.3) is currently out of service. Double cut tows will have to be locked the conventional way (without the use of tow haulage). A follow up notice will be distributed when the tow haulage equipment is back in service.

  • MKARNS Annual Navigation Notice No. 1-2025

    As a result of partnering efforts with navigation stakeholders, the attached consolidated Notice to Navigation Interests has been prepared for the McClellan-Kerr Arkansas River Navigation System (MKARNS). The intent is to provide consistency by reviewing and informing current district regulations with a joint notice that will be updated annually. The notice is applicable to the Little Rock (SWL) and Tulsa (SWT) Districts.

  • MKARNS Nav Notice No. SWL 25-14 Lock 3 Unscheduled Closure

    Due to issues with the Tainter valve equipment, Joe Hardin Lock (No. 3) NM 50.2 is currently closed to traffic. Crews are onsite and will have the Lock reopened as soon as the repairs are completed. A subsequent Navigation Notice will be issued once the Lock has been opened to traffic.

  • MKARNS Nav Notice No. SWL 25-13 Lock 3 Intermittent Delays 

    Mariners should expect to experience intermittent delays at Joe Hardin Lock (No. 3) NM 50.2 on February 27, 2025, between the hours of 6:00 a.m. and 6:00 p.m. The intermittent delays are required to facilitate work on the hydraulic system.

  • USACE lifts small craft advisory for Arkansas River

    LITTLE ROCK, Ark. – The U.S. Army Corps of Engineers is lifting the small craft advisory for the Arkansas River. Small craft advisories are issued when flows reach 70,000 cubic feet per second.