Joe Hardin Lock (No. 3) NM 50.2 at Altheimer will be closed to navigation traffic on the McClellan-Kerr Arkansas River Navigation System from 6 a.m. to 7:30 p.m. Friday, Sept. 20, and from 6 a.m. to 7:30 p.m. Sunday, Sept. 22.

The purpose is to replace sections of hydraulic piping. If the work is completed ahead of schedule, the lock will reopen earlier, however, unforeseen problems could require additional time, according to a news release.

Details: U.S. Army Corps of Engineers, Little Rock District Office, or 501-324-5739.