Power Plant Road Bridge

This project involved the construction of a 144′-6″ clear span steel multi-girder structure with a composite, reinforced deck. The original structure was a single lane, concrete arch bridge with concrete spandrel walls retaining the dirt roadway fill. The bridge was a dual span bridge with a center pier. The center pier was an obstruction to the flow of Two Lick Creek and collected debris, further restricting the waterway opening. This area of Two Lick Creek had constant flood problems. Indiana County, with the assistance of Gibson-Thomas Engineering Co., Inc. was able to obtain funding from the Pennsylvania Department of Transportation (PennDOT) under Act 26 for the replacement of this bridge. The new bridge design eliminated the need for a center pier by using 48-inch deep steel beams. The beam design was performed using PennDOT’s LRFD design criteria. The results of this design permitted the use of steel beams that were much lighter and more cost effective than designs using other criteria. The steel beams where manufactured using weathering steel, which will eliminate the need for any painting of the beams. The successful completion of this project has greatly improved the surrounding area by reducing the flooding occurrences of Two Lick Creek. The new bridge is relatively maintenance free and will serve the traveling public for many years.


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Gibson-Thomas Engineering Co., Inc. is a multi-discipline consulting engineering firm established in 1916 in Latrobe, Pennsylvania. Our past experience, key staff and commitment to total client satisfaction are the major factors that our clients consider when contracting with Gibson-Thomas Engineering.

724-539-8562
Corporate Office
  • Corporate Office
    • 1004 Ligonier Street
      Latrobe, PA 15650
    • P: 724-539-8562
Pennsylvania Offices
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    • East Brady, PA
    • P: 724-526-2190
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    • Indiana, PA
    • P: 724-471-2246
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