Pearce Mill Road Shared Use

Allegheny County, Pennsylvania

SAI was responsible for the preliminary engineering and final design for the widening of Pearce Mill Road (a shared-use roadway with a pedestrian/bicycle lane) in Allegheny County, Pennsylvania. This project involved heavy coordination with the Allegheny County Department of Public Works and the Allegheny County Parks Department to develop a “green” solution to this shared-use roadway widening.

Physical Features:

  • Approximately 2.25 miles of roadway widening on a two-lane urban minor collector road with an ADT of 2,613.
  • Roadway includes:
    • Brown to Walter
      • Two 5′ bike lanes.
      • Two 10′ vehicle lanes.
      • No shoulders.
    • Walter to Babcock
      • One 5′ bike lane (lake side).
      • One 7′ pedestrian lane.
      • Two 10′ vehicle lanes.
      • Shoulder on non-lake side varies from 1′ to 4′ (approximately).

 Other Features:

  • Tangent and curved geometry both on and off existing alignment.
  • Alignment was adjusted to limit impacts to adjacent wetland, North Park Lake, and Marshall Lake.
  • Traffic maintained via phased construction with partial detours.
  • Green infrastructure such as bioswales and other potential green design solutions.
  • Preliminary alignment study.
  • Hydraulic design and hydrologic studies.
  • Permit acquisition and agency coordination.
  • Erosion and sediment pollution control plan.
  • Signing and pavement marking plan.
  • Community involvement.

Project Owner: Allegheny County Department of Public Works

Completion Date: 2021

Cost: $7,200,000

Images after improvement project.