U.S. Army Corps of Engineers St. Louis District » Directory U.S. Army Corps of Engineers St. Louis District » Directory Go back to directory. Add to Address Book. U.S. Army Corps of Engineers St. Louis District U.S. Army Corps of Engineers St. Louis District Contact: Jennifer Backer Work Email: jennifer.a.backer@usace.army.milINTERNET Categories: Federal Updated 4 months ago.