Navigation Notice for Upcoming Hannibal Work (NTNI 20684) June 3 – November 9, 2024

Notice Number: 206824
Date: 06/03/2024 10:00 thru 11/09/2024 05:00

1. To Whom It May Concern: Notice is given that the U.S Army Corps of Engineers Repair Fleet will be performing maintenance work on miter gates and the 110-ft x 1200-ft primary lock chamber at Hannibal L/D will be closed from 6:00 AM June 3, 2024, through 11:59 PM November 8, 2024. The 110-ft x 600-ft auxiliary chamber will remain open to navigation during this time except as noted below.

Throughout the progress of the work there will instances where both chambers will be closed to facilitate concrete placement. The closure of both chambers will be for up to 12 hours. Advanced notice will be provided to alert industry of the closure of both chambers.

2. Common terms used for this notice:

a. Primary Vessel: The vessel that is in control of the full tow in transit before and after being broken into smaller tows (strings) for lockage.

b. Helper Boat: Vessel used by towing company to perform lockage when the primary tow is broken into a series of smaller tows (strings).

c. Pull Boat: Vessel in queue designated by USACE to pull cuts from the chamber during self-help.

3. PROCEDURES FOR AUXILIARY CHAMBER OPERATIONS: The Corps will institute the following lockage procedure which has been developed in cooperation with the Waterway Association of Pittsburgh. Boat locking order will be determined by arrival time at Hannibal L/D, and all pilots should radio Hannibal L/D at normal arrival points. All tows must be ready to lock when added to the que. Red flag barges must be reported by the pilot during this radio call. All tows must be ready to lock when added to the tier sheet.

4. The Corps has installed a temporary tow haulage winch system in the auxiliary lock chamber to pull double cuts, as necessary. In an effort to reduce delay time at the locks, a program of “self-help” by navigation interests is necessary. A “self-help” program will allow waiting towboats to assist tows out of the lock chamber. The Lockmaster will designate the pull boats as tows arrive for position; all vessels including those with a red flag in tow can be designated as a helper boat. If a vessel refuses to be a helper boat, they must provide a replacement or go to the end of the queue. The second and third towboats in the first series of lockages in the opposite direction will be the designated pull boats. It will be necessary for all towboats to monitor their radios 24 hours a day. Due to the location of the tow haulage equipment, tow configurations of less than 104-ft in width will require self-help.

5. During the closure of the 110-ft x 1200-ft primary lock chamber, tows should move to the closest mooring cell for staging prior to their lockage turn. It will be necessary for tows, under normal river conditions, to follow one another on the wall when a series of lockages are being made in one direction. Each tow in the series should be aware of the tow that they follow and be on the wall as soon as that tow enters the lock chamber. While this practice will speed up the lockage process, it is imperative that tows exercise extreme caution when encountering outdraft or backlash conditions.

6. Other specific procedures to facilitate lockage operations through the auxiliary lock chamber have been developed in cooperation with the towing industry. The Corps is asking for everyone’s cooperation and help in making the locking operations go as smoothly as possible during the closure of the primary chamber.

a. All excess rigging will be removed prior to entering the lock chamber. Remaining rigging should be ready to be knocked loose after the cut is secured in the lock chamber.

b. All upbound lockages will require two locking lines, one on the head and one stern and must be available on each cut. All down bound lockages will require two locking lines, one head and one stern. Each line must be at least 75 feet long and 1- 1/2” in diameter. To minimize locking time, all lines will stay with each cut. Lines will not be permitted to be carried from one cut to another.

c. Three deckhands are required during multiple lockages.

7. Towboats are cautioned to use minimal power when operating over the lower sill to avoid forcing debris onto the miter sill. This debris could prevent the miter gates from closing and require stoppage of navigation until the material is removed by dredging or diving operations.

8. If critical industrial shipments are essential to sustain continued operation, the affected companies should immediately contact Shane Checkan of the Waterways Association of Pittsburgh ( at least 36 hours prior to the scheduled lockage. Only the designated cargo or barges will be given priority unless stated in the request that all barges in that tow be given priority. They will review all requests for priority before submitting them to the Corps for our consideration. If it becomes necessary to prioritize lockages through the auxiliary lock chamber, the Corps will make the final decision concerning lockage procedures as conditions and situations change. In accordance with standard Corps policy, the Lockmaster may also vary the locking procedure in an effort to equalize waiting times.

9. Recreation boaters are discouraged from locking through Hannibal L/D, Ohio River, during this unscheduled lock closure. Recreation boaters will encounter extremely long delays since priority will be given to scheduled commercial passenger vessels and commercial tows.

10. Information concerning lockages will be broadcast by radio on Channel 13 (155.65 MHz) and any towboat not answering a call from the locks will be dropped to the end of the waiting list.



Vincent DeCarlo, P.E. , Chief, Operations Division