MKARNS Navigation Notices

21 Aug 2026

MKARNS Nav Notice SWL 26-31 Channel Obstruction Cleared NM 119

The river obstruction at NM 119 (between Broadway and Main Street Bridges) has been removed. The area is clear for all transit. Ref: Navigation Notice SWL 26-30.

19 Aug 2026

MKARNS Nav Notice SWL 26-30 Caution Advisory NM 119

Mariners are advised that there is an obstruction in the river near the left descending side of the navigation channel at NM 119, between the Broadway and Main Street Bridges. The obstruction appears to be a derelict wooden pile protruding just above the waterline. Crews are mobilizing to investigate the obstruction and will attempt to remove it tomorrow, August 20, 2026.

18 Aug 2026

MKARNS Nav Notice SWL 26-29 Lock 10 Early Closure

Mariners are advised that due to a critical construction activity related to the 110 ft. stoplog conversions, the daytime closure at Dardanelle Lock (No. 10) NM 205.5 will begin at 3:00 a.m. on Thursday August 20th, 2026, and end at 3:00 p.m. on Thursday August 20th, 2026. To offset the early closure start, the lock will open early to traffic at 4:00 p.m. on Wednesday August 19th, 2026.

28 Jul 2026

MKARNS Nav Notice SWL 26-27 Lock 13 Early Closure

Mariners are advised that due to a critical construction activity related to the 110 ft. stoplog conversions, the daytime closure at James W. Trimble Lock (No. 13) NM 292.8 will begin at 5:00 a.m. on Monday August 3rd, 2026, and Friday August 7th, 2026.

22 Jul 2026

MKARNS Nav Notice SWL 26-26 Lock 1 Repair Closure

Mariners are advised that Norrell Lock (No. 1) NM 10.3 will be closed to traffic beginning at 6:00 a.m. until 2:00 p.m. on July 29th, 2026. The lock closure is required to facilitate concrete repair of the lock parapet wall.

22 Jul 2026

MKARNS Nav Not 26-25 Lock 13 Early Closure

Mariners are advised that due to a critical construction activity related to the 110 ft. stoplog conversions, the daytime closure at James A. Trimble Lock (No. 13) NM 292.8 will begin at 5:00 a.m. on Wednesday July 29th, 2026.

22 Jul 2026

MKARNS Nav Notice 26-24 Multiple Location Locking Instructions

SPECIAL LOCKING INSTRUCTIONS MULTIPLE LOCATONS MCCLELLAN-KERR ARKANSAS RIVER NAVIGATION SYSTEM Due to ongoing construction at the following locations on the McClellan-Kerr Arkansas River Navigation System •Murry Lock (No.7) NM 125.4 •Toad Suck Ferry Lock (No. 8) NM 155.9 •Arthur V. Ormond Lock (No. 9) NM 176.9 •Dardanelle Lock (No. 10) NM 205.5 •Ozark Jetta-Taylor Lock (No. 12) NM 256.9 •James W. Trimble Lock (No. 13) NM 292.8

13 Jul 2026

MKARNS Nav Notice 26-23 Lock 1 Intermittent Delays

Mariners should expect to experience intermittent delays at Norrell Lock (No. 1) NM 10.3 July 13, 2026 – July 17, 2026, 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.

22 Jun 2026

MKARNS Nav Notice 26-22 Intermittent Delays (Clinton Presidential Park Bridge NM 118.2)

Mariners may experience intermittent delays at the Clinton Presidential Park Bridge (NM 118.2). These delays are necessary to facilitate the reconstruction of an upstream bridge pier protection cell. The contractor is expected to begin mobilizing equipment this week with construction beginning in roughly 10 days. The project is expected to take up to six months to complete.

13 Jun 2026

MKARNS Nav Notice SWL 26-21 Lock Cutoff Times for Towing Configurations

Mariners are advised that starting June 15th, 2026, and continuing until this Navigation Notice is rescinded, the following lockage cutoff times with corresponding tow configurations will be in place at Murray Lock (No. 7) NM 125.0, Toad Suck Lock (No. 8) NM 155.9, Arthur V. Ormond Lock (No. 9) NM 176.9, Dardanelle Lock (No. 10) NM 205.5, Ozark - Jeta Taylor Lock (No. 12) NM 256.8, and James W. Trimble Lock (No. 13) NM 292.8.