J.P. Murtha Lock & Dam aka Lock 4 (MR 41.5) – Lock 4 will be closed to navigation on Tuesdays, Wednesdays, and Thursdays from 0600 to 1600 from August 3rd through October 1st.
Emsworth Lock Closures (OR 6.2) – Beginning April 27th thru Sept. 4th, the auxiliary chamber will be closed daily from 0600 to 2359, and the primary chamber will have intermittent closures for filling valve maintenance. Primary chamber tow restriction: max tow width of 78 feet.
Pike Island Lock Closure (OR 84.30) – Lock will be closed for repairs from 0800-1600 on August 5th and August 6th. On August 7th, closure will be in effect from 0900-1330.
Channel Closure (OR 498.0) – Intermittent river closures from 0700 – 1700 August 3rd-6th for aerial power line replacement
Chicago/Illinois/Upper Miss
Lock 25 (UM 241.40) – Lock will be closed daily for repairs from 0700 – 1900 on August 4th and August 6th.
Lock 19 (UM 364.40) – Daily lock closures from 0600 – 1800 on the following dates for work in preparation for the construction project this upcoming winter: August 3rd -7th, August 10th – 14th, August 17th -21st
Lower Miss/Gulf/Canals/Tenn Tom
Effective August 3, 2026, ACBL has implemented our low water protocol based on readings from the Memphis gauge reaching 0′. Please be advised that low water surcharges will be applied in accordance with the terms outlined in your contract.
Arkansas River Lock Closures (multiple locks) – Daily lock closures from 0700 – 1900 from June 15th through September 30th for work related to the 110-ft Stoplog Conversion project. These closures will occur at the following locations : Dardanelle Lock (No. 10) – AK 205.5, James W. Trimble Lock (No. 13) – AK 292.8, Murry Lock (No.7) – AK 125.4, Toad Suck Ferry Lock (No. 8) – AK155.9, Arthur V. Ormond Lock (No. 9) – AK 176.9, and Ozark Jetta-Taylor Lock (No. 12) – AK 256.9. Transit times will be substantially impacted.
Port Allen Lock Closure (LM 228.4) – Daily lock closures of up to 12 hours, during daylight hours only, August 4th through August 12th for dredging.
Brazos Lock Closure (WC 401) – As of July 6th, lock closures have shifted back to daytime. Restrictions will take place Monday-Friday, between 0700 and 1900 through August 28th to allow for repair work.
Calcasieu Lock North Chamber Wall Replacement (WC 238) – Beginning May 18th through approx. September 18th, the Calcasieu Lock will have daytime closures Monday through Friday from 0700-1900 for major repairs to the north chamber wall. The maritime industry anticipates these closures will result in significant delays of 3-5 days. ACBL will continue to monitor the situation closely and will provide updates and additional information as it becomes available.
