OZARK-JETA TAYLOR L&D and JAMES W. TRIMBLE L&D - Effective 01 October 2012, Ozark-Jeta Taylor Lock and Dam (No. 12) NM 256.8 and James W. Trimble Lock and Dam (No. 13) NM 292.8 will be taken out of service daily for a 4-hour maintenance period. The maintenance period is scheduled to begin at 8 a.m. each day, but may be delayed to complete a lockage that is underway, or to lock a commercial vessel that is within the arrival area before 8 a.m. Once begun, the maintenance period will continue for a full 4 hours.