This project involved the construction of a 50′-0″ clear span steel multi-girder structure with a composite, reinforced deck. The existing structure, built in 1914, was a single lane, concrete arch bridge with concrete spandrel walls retaining the dirt roadway fill. The bridge was determined to be an historic structure and recordation was performed for the Pennsylvania Historical & Museum Commission, before final design was completed. The width of the hydraulic opening was inadequate to ensure that flooding would not occur, since floodplain on either side of the channel is not present. Due to the location of the roadway, moving the bridge was not possible, and increasing the span as needed (80â€™ was determined necessary) made each approach a 90â€™ turn. Close cooperation with the Army Corps of Engineers was necessary to obtain dispensation for an interim solution, since the site is in the backwater area of the Conemaugh River Lake Dam. The structure span was increased from 39â€™-0â€ to 50â€™-0â€ and the far approach was depressed to create a channel for floodwaters without overtopping or increasing backwater. The depression of the far approach and location made an advisory speed limit necessary, as well as an extreme super elevation of the roadway and bridge.
Indiana County Transit Authority City of Indiana, Indiana County, PA
St. Vincent College Unity Township, Westmoreland County, PA
Indian Ridge – Residential Land Development North Strabane Township, Washington County, PA
Arbor Trail – Residential Land Development Robinson Township, Allegheny County, PA
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