Chartiers 12 (Canonsburg Lake) Bridge Replacement

Washington County, Pennsylvania
Canonsburg, Pennsylvania

SAI was responsible for the Preliminary Engineering, Final Design and Construction Consultation.

Physical Features:

  • Consists of a 164′-0″ two-span structure with weathering steel plate girders supported on integral abutments and a drilled shaft center pier. The bridge width was increased to two 10′-0″ lanes, a 4′-0″ right shoulder, and a 9′-0″ left shoulder that includes an additional 5′-0″ for a future sidewalk.
  • Replaced a unique 20′-0″ wide, 140′-0″ long, three-span concrete thru-girder structure constructed in 1943.
  • Approximately 1300′ of roadway approach and 400′ of widened causeway across the lake.
  • Constructed 500′ of new lake access.

Other Features:

  • Carries McDowell Lane (Township Road T-717) over Canonsburg Lake (Little Chartiers Creek) in Washington County, PA
  • The lake is owned by the Pennsylvania Fish and Boat Commission (PAFBC).
  • Provided aesthetic treatment to the exposed concrete barriers.
  • Required a Bald Eagle monitoring program and permit.
  • Construction was limited by trout stocking restrictions.
  • Improved pedestrian and bicycle connectivity with widened bridge.
  • Required deep water construction techniques and fill under water.
  • Replaced drainage system.
  • Complex staged demolition for existing structure.
  • Partnering with townships to include roadway preservation with this project to reduce costs.
  • Partnering with the PAFBC to rehabilitate one parking lot, provide lake access for the physically impaired, and improved lake access.

Client Owner: Washington County Planning Commission
Completion: 2021
Construction Cost: $3,000,000