Client
Pickaway County
Location
Circleville/Walnut Township, Ohio
Services Provided
Roadway Design
Roundabout Design
Intersection Improvement
Lighting
MOT
Safety Analysis
Storm Sewer Design
Culvert Design
Curb Design
Data Collection
Drainage Improvements
Survey Services
Traffic Analysis
Traffic Control
Utility Coordination
Walnut Creek Pike & Bell Station Road Roundabout
Pickaway County secured CEAO HSIP funding for a safety study at the intersection of Walnut Creek Pike and Bell Station Road, and CM was selected to complete the study. CM collected traffic data, performed capacity and safety analyses, developed short- and long-term countermeasures, and prepared concept plans, cost estimates, and benefit-cost analyses. CM assisted the County in obtaining formal HSIP funding to construct a roundabout, was subsequently selected for final design.
Construction plans were prepared for a single-lane roundabout with single-lane approaches over approximately 0.25 miles. During final design, the roundabout was shifted approximately 75’ north to avoid recently installed high-voltage poles. Superelevation was added on Bell Station Road to accommodate the revised alignment.
Due to the 45/55 mph approach speeds, splitter islands ranged from 175’ to 200’ to enhance deflection and safety. An outside truck apron (4.8’ maximum) was incorporated along the southern leg of Walnut Creek Pike to accommodate the WB-62 design vehicle and farm equipment.
Drainage improvements included shallow ditches, catch basins, and storm sewer along the eastern portion of the project, transitioning to open ditches beyond curb and gutter limits. 3’ curb cuts with tied concrete block mats conveyed runoff to adjacent ditches. Two new cross pipes were installed under Bell Station Road, and the existing 42” pipe on the north leg was extended for roadway widening. Post-construction BMPs were provided through vegetated filter strips and biofilters, and undercut was performed where unsuitable subgrade was encountered.
The project was constructed under a single-phase detour. Public involvement was conducted through County-hosted online presentations with supporting exhibits. The project was built at a final cost of $1.93 million.
