The U.S. Army Corps of Engineers is hosting four public workshops for the Melvin Price Locks and Dam water control manual revision. Workshops will be held Tuesday, Dec. 13 from 1–3 p.m. and from 6–8 p.m. at the National Great Rivers Museum located at #2 Locks and Dam Way in Alton, Illinois, and Thursday, Dec. 15 from 1–3 p.m. and from 6–8 p.m. at the Grafton City Hall located at 118 E Main St. in Grafton, Illinois.