WALLISVILLE, Texas (May 24, 2012) – The U.S. Army Corps of Engineers Galveston District’s Wallisville Lake Project staff closed the salt water barrier navigation lock this morning to impede salinity intrusion on the Trinity River. The Corps will open the lock every hour on the hour from 7 a.m. to 8 p.m. daily if needed to allow recreational boaters to move up and down the river.