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MKARNS Navigation Notices

Current navigation and sailing notices for the McClellan-Kerr Arkansas River Navigation System

18 Locks & Dams
10 Navigation Pools
445 Miles of Waterway
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David D. Terry L&D MRER

⚠ Important Navigation Information

Mariners: Check notices regularly for current channel conditions, restrictions, and safety information.

For the most up-to-date navigation information, visit the Notices To Navigation Interests (NTNI) website.

Navigation Notices

  • MKARNS Nav Notice No. SWL 25-48 Lock 1 Operational

    Due to tailwater elevations falling below 143.0 feet at Norrell Lock (No. 1) NM 10.3, the lock chamber is now operational for navigation.  All vessels are required to pass through lock. Vessels may contact Norrell Lock and Dam on Channel 16 for further information.

  • MKARNS Nav Notice No. SWL 25-42 Lock 9 Reopened

    Arthur V. Ormond Lock (No. 9) NM 176.9 has reopened to navigation traffic.

  • Single lane closure scheduled for Highway 187 across Beaver Dam

    The U.S. Army Corps of Engineers will be closing one lane of the Highway 187 bridge across Beaver Dam from 8 a.m. until 5 p.m. June 26, 2025, for a routine bridge inspection.

  • MKARNS Nav Notice No. SWL 25-46 SAILING INSTRUCTION NM 221.2 to NM 221.7

    Due to shoaling, mariners are advised that until further notice, both upbound and downbound tows should run the green line from NM 221.2 to 221.7.

  • MKARNS Nav Notice No. SWL 25-45 Lock 9 Closure - High flows

    Due to high flows on the McClellan-Kerr Arkansas River Navigation System, the Arthur V. Ormond Lock (No. 9) NM 176.9 is closed to traffic. The lock will reopen as the flows drop to safe navigation levels.

  • MKARNS Nav Notice No. SWL 25-44 Lock 5 Tow Haulage Out of Service

    The tow haulage equipment at Colonel Charles D. Maynard Lock (No. 5) NM 86.3 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 Nav Notice No. SWL 25-43 Lock 1 Navigation Pass Open (Through Lock)

    The tailwater elevation at Norrell Lock (No. 1) NM 10.3 has exceeded 143.0 feet. All vessels will be directed to transit through the lock chamber with pinned open gates while the tailwater elevation remains above 143.0 feet.

  • MKARNS Nav Notice No. SWL 25-41 Lock 9 Closure - High flows

    Due to high flows on the McClellan-Kerr Arkansas River Navigation System, the Arthur V. Ormond Lock (No. 9) NM 176.9 is closed to traffic. The lock will reopen as the flows drop to safe navigation levels.

  • MKARNS Nav Notice No. SWL 25-40 Lock 13 Closure Notice

    A partial lock closure is scheduled for James W. Trible Lock (No. 13) NM 292.8 beginning June 15th, 2025, through September 30th, 2025. During this time, the Lock will be closed daily between the hours of 7:00 a.m. and 7:00 p.m. The lock will be opened to traffic each night between the hours of 7:00 p.m. and 7:00 a.m., however a 70-ft width restriction will be in place.

  • MKARNS Nav Notice No. SWL 25-39 Lock 10 Closure Notice

    A partial lock closure is scheduled for Dardanelle Lock (No. 10) NM 205.5 beginning June 15th, 2025, through September 30th, 2025. During this time, the Lock will be closed daily between the hours of 7:00 a.m. and 7:00 p.m. The Lock will be opened to traffic each night between the hours of 7:00 p.m. and 7:00 a.m., however a 70-ft width restriction will be in place.

Navigation Notices Archive