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).
- Brown to Walter
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.