GAI, in partnership with A.L.L. Construction, Inc., is serving as the lead designer and engineer of record for the Kerens-to-Parsons segment (Section 3) of Appalachian Corridor H (US 48) in Tucker County, West Virginia. Delivered for the West Virginia Division of Highways (WVDOH), this approximately 3-mile design-build project advances a critical portion of the state’s east–west highway system through steep Appalachian terrain. It is also part of a broader multi-contract program establishing continuous four-lane connectivity along the proposed corridor, reflecting a highly integrated engineering approach that balances constructability, cost efficiency, and environmental stewardship in a geotechnically complex setting.

The design supports phased construction sequencing in a constrained, mountainous environment, addressing limited access, steep haul routes, and variable weather conditions, with careful consideration given to temporary drainage and slope stability during construction. During the pursuit and preliminary design phases, GAI developed alternative technical concepts (ATCs) that optimized horizontal and vertical alignments to reduce cut/fill imbalance, minimize mass excavation, and eliminate select major drainage structures. These refinements improved constructability, reduced overall project impacts, and enhanced the geometric design of local road connections, while maintaining compliance with project criteria. The project also incorporates complex hydraulic and drainage design tailored to steep terrain and high-velocity runoff conditions. Deep drainage systems utilizing specialty pipe installations, slope interceptors, and energy dissipation features manage peak flows, debris loading, and scour potential, allowing for the reduction of larger cross-drainage structures.

The Kerens-to-Parsons segment represents a key milestone toward completion of Corridor H, and will significantly improve regional mobility and economic connectivity while demonstrating innovative engineering solutions in complex Appalachian terrain.