24th Street Bridge (Adams County, Illinois)
Built 1936Concrete bridge over Cedar Creek on IL 96 (24th Street) in QuincyOpen to traffic
Curtis Creek Bridge (Adams County, Illinois)
Built 1899; rehabilitated 1995Stone arch bridge over Curtis Creek on South 8th Street in QuincyOpen to two-lane traffic
Pier Restaurant Bridge (Adams County, Illinois)
Lost bridge over Quincy Bay at the Quincy riverfrontBridge no longer standing, but one pier used as foundation for the "Pier Restaurant"
Quincy Bay Railroad Bridge (Adams County, Illinois)
Plate girder bridge over Quincy Bay on the BNSF Railroad in QuincyOpen to railroad traffic
Quincy Bayview Bridge (Adams County, Illinois)
Built 1986 at a cost of $17,230,000Cable-stayed bridge over the Mississippi River on westbound US 24 at QuincyOpen to two lanes of westbound traffic
Quincy Memorial Bridge (Adams County, Illinois)
Built 1928-1930; rehabilitated 1981Cantilevered through truss bridge over the Mississippi River on eastbound US 24 at QuincyOpen to two lanes of eastbound traffic
Quincy Railroad Bridge (Adams County, Illinois)
Originally opened Nov. 9, 1868; later rebuiltThrough truss bridge over the Mississippi River on the BNSF Railroad (formerly CB&Q) at QuincyOpen to railroad traffic
Quinsippi Island Bridge (Adams County, Illinois)
Possibly built 1868 by the CB&Q Railroad; later retrofitted for vehicle trafficPlate girder swing bridge over Quincy Bay providing access to Quinsippi Island Park in QuincyOpen to one-lane traffic