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  • MKARNS Nav Notice 25-68 UPDATE: SCHEDULED LOCK 13 CLOSURE NOTICE

    Mariners are advised that the partial lock closure at James W. Trimble Lock (No. 13) NM 292.8 has been extended through October 18th, 2025. During this time, the Lock will be closed daily (Monday thru Saturday) 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., and all day on Sundays, however a 70-ft width restriction will be in place.

  • MKARNS Nav Notice 25-67 MPLD Nav Pass Closed

    Due to falling river elevations, the crest gate dam at Montgomery Point Lock and Dam (NM 0.5) is in operation and the navigation pass is closed. All vessels are required to pass through the lock until further notice.

  • MKARNS Nav Notice SWL 25-66 Lock 8 Tow Haulage Return to Service

    The tow haulage equipment at Toad Suck Lock (No. 8) NM 155.9 has returned to service.

  • MKARNS Nav Notice SWL 25-65 Caution Advisory NM 291.6 I-49 Bridge

    Mariners are advised that work/crane barges will be positioned outside the left descending navigation channel beginning on or around September 17, 2025, for the start of construction of the Interstate-49 Bridge at NM 291.6 just downstream of James W. Trimble Lock and Dam (No. 13).

  • MKARNS Nav Notice SWL 25-64 Sailing Instructions NM 237.1 to 238.1

    Due to shoaling, mariners are advised that until further notice, both upbound and downbound tows should favor the red buoys from NM 237.1 to 238.1.

  • MKARNS Nav Notice SWL 25-61 Lock 9 Sailing Instructions Lifted

    The sailing instructions for the downstream approach to Arthur V. Ormond Lock (No. 9) NM 176.9, noted in Nav Notice SWL 24-19 have been lifted.

  • MKARNS Nav Notice SWL 25-60 Lock 10 Reopened

    The mechanical issues at Dardanelle Lock (No. 10) NM 205.5 have been resolved and the lock is opened to traffic.

  • MKARNS Nav Notice SWL 25-58 Safety Zone Military Exercise NM 289.0 – NM 292.8

    To ensure the safety of life and property during the military river crossing exercise, a Safety Zone will be established by the U.S. Coast Guard for the Arkansas River from NM 289.0 to NM 292.8.

  • MKARNS Nav Notice 25-59 Lock 10 Unscheduled Closure

    Dardanelle Lock (No. 10) NM 205.5 is currently closed to traffic due to dangerous cross currents downstream of the dam. The spillway release configuration is currently restricted due to mechanical issues resulting in concentrated flows that present a danger to traffic in the downstream approach. Crews are onsite and an additional notice will be submitted when the issue is resolved.

  • MKARNS Nav Notice 25-57 Caution Advisory - HWY 64 Bridge NM 300.4

    Mariners are advised that a hydrodemolition project is scheduled over the navigation span of the HWY 64 Bridge, NM 300.4, from 7 p.m. on August 16, 2025 to 7 a.m. on August 17, 2025. During this time mariners should contact the onsite workboat at VHF Channel 16 or 68, or by phone at (479) 629-2996 prior to arrival to coordinate a work stoppage to allow for safe passage under the bridge.