Sector Upper Mississippi River (UMR) is located on the 7th floor of the Robert A. Young Federal Building in downtown St. Louis, Missouri. The Sector is the parent command to three Marine Safety Detachments, five River Buoy Tenders, and a boat forces unit with 5 response boats. Together, the Sector and it's subordinate units directly support the Coast Guard's five main mission areas; including maritime security, maritime safety, protection of natural resources, maritime mobility, and national defense across a geographically expansive area of responsibility encompassing the Upper Mississippi, Illinois, and Missouri Rivers and their navigable tributaries.