ROBERT ST. MISSISSIPPI RIVER St. Paul District U.S. Army Corps of Engineers Visitor Instructions US Army Corps of Engineers 180 5th St E, Suite 700 St Paul, MN 55101 Instructions to USACE Visitors: Enter the building on the 5th street side, take 5th street elevators to the 7th floor, and report to the security guard. Note - if entering from the 4th street side, Jackson St Skyway, or 4th St Skyway there is no public access to USACE. Visitors must use the 5th street entrance for 7th floor access.