18th Street Bridge, Quincy, Illinois
This project consisted of providing the design of a new bridge over the Burlington Northern Santa Fe (BNSF) Railroad tracks and over Cedar Creek on North 18th Street in Quincy, Illinois. This bridge measures 461 feet from back of abutment to back of abutment, with spans of 98 feet. The superstructure consists of 42” deep steel plate girders with a poured concrete deck.
The bridge has two 12 foot vehicle lanes with 5 foot bike lanes on both sides and a 6 foot sidewalk on the west side. At each abutment, a mechanically stabilized earth (M.S.E.) wall was utilized as a retaining structure to keep the bridge at an economical length.
New approach roadways and associated drainage design were also within the scope of this project. This project received innovative design funding for the use of galvanizing on all of the steel items including the plate girders, reinforcing steel, bearings and fencing and railing.
Bridge structure, roadway and all aspects of the project were completed in 2002.