Repairs will begin next month at a lock on the Mississippi River in southwest Wisconsin. The U-S Army Corps of Engineers plans to fix the armor plate and concrete in the lock chamber at Lock and Dam Number Ten between Glenhaven and Cassville in Grant County. Officials say the lock will close December 12th, or earlier if ice forms on the river by then.  Sam Mathiowetz of the Army Corps at Saint Paul says the project will result in safer passage by boats on the river — and it’s being done during the winter to reduce the impact on boat traffic. The lock is right next to Guttenberg, Iowa, and it’s expected to reopen March fourth.