Gibson-Thomas was retained by Indiana County to design the replacement of the structure carrying T-469 (Fitzgerald Road) over Cherry Run. The project site is located approximately two miles northwest of Homer City in Center Township. The existing 30’-0” single span steel beam bridge was classified as structurally deficient and functionally obsolete. In addition, the existing narrow roadway had substandard vertical curves that did not provide adequate sight distance.
The proposed structure consisted of prestressed concrete spread box beams with a composite reinforced concrete deck. The span of the structure was increased to 35’-0” to decrease the regulatory flood elevations in the vicinity of the structure. The roadway approaches were reconstructed to modern design criteria to provide safe sight distances. A small unnamed tributary with macroinvertebrate species in the southwest quadrant was relocated and planted with shrubs and trees. Rock lining was provided along Cherry Run to protect against scouring of the stream banks and to contain flood waters. The roadway and structure were designed to minimize environmental impacts, especially due to the presence of a wetland mitigation cell in the southeast quadrant installed as part of a nearby SR 0422 construction project. Traffic was detoured around the site using the adjacent roadway network.
The Fitzgerald Bridge project was completed in 2005.