The project, located approximately 2 miles northwest of the Borough of Homer City in Center Township, Indiana County, involved the construction of a 35â€™-2â€ clear span, spread prestressed box beam structure with a composite reinforced concrete deck. The existing single lane, 30â€™-0â€ single span, steel beam bridge was structurally deficient and functionally obsolete while the narrow roadway vertical geometry was also deficient with inadequate sight distance.
Gibson-Thomas Engineering proposed roadway work which included improvements to the vertical alignment by reducing the roadway grades and increasing sight distances to meet Department design criteria. By increasing the clear span, it was possible to minimize the effects of backwater caused by raising the approach roadways and reduce design storm elevations in the vicinity of the structure. This reduced the risk of over topping of the roadway. A natural, low flow channel to contain a small tributary was provided on the far left approach due to the presence of macroinvertebrate. The channel also has rock-lined banks above the natural channel to contain floodwaters. The resultant design allowed for a cost-effective bridge replacement with little environmental impacts, which was extremely important since the Department had purchased land in the far, right quadrant of the project to relocate wetlands affected during the construction of the S.R. 0422 Bypass of Indiana Borough.
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