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Allen Road Grade Separation Project

The project consisted of relocating Allen Road and creating an underpass crossing for CN Railroad north of Van Horn Road. Hennessey Engineers was tasked with relocating a 42-inch DWSD transmission water main, a 12-inch City of Woodhaven water main, and a 24-inch sanitary sewer main. Hennessey also designed a temporary bypass roadway and provided topographic survey, x-sections, easement and boundary preparation.

Hennessey Engineers led the coordination of all utility relocations including DTE, Buckeye Gas, Plains Gas, Marathon, Centurylink, and Qwest Communications.

The temporary road bypass was designed to accommodate Allen Road traffic during construction and involved temporary road closures, detour routes, signage, flag persons, and traffic control devices.

Civil Engineering Civil Engineering

Land Surveying Land Surveying

Construction Engineering Construction Engineering

Key Facts
  • Multi-firm design team relocated Allen Road and created an underpass crossing for CN Railroad.
  • Relocated 42" DWSD transmission water main, 12" Woodhaven water main, and 24" sanitary sewer main.
  • Coordinated all utility relocations.
  • Designed temporary Allen Road bypass during construction to accommodate traffic.

City of Woodhaven, MI


Allen Road

Project Date

Est. Completion 2023

Project Costs

$4M / $39M