DGL has one of the largest transportation engineering groups in Northwest Ohio. We provide professional services on a wide variety of projects, including everything from simple roadway widening to complex major interchange construction. Our knowledge in the development of transportation projects allows us to perform a full range of services which include:


  • Erosion / Sediment Control Design and Inspection Services
  • Floodplain and Hydraulic Analysis
  • Highway / Railroad Grade Separations
  • Hydrology and Drainage Design
  • Interchange Design
  • Transportation Master Planning
  • Pavement Evaluation and Rehabilitation
  • Retaining Walls
  • Street and Roadway Design
  • Stormwater Pollution Prevention Plans, Installation Inspection and Monitoring
  • Post-construction Best Management Practices
  • Design / Build
  • Grant Writing


  • Bridge Design
  • Culvert Design
  • Retaining Wall Design
  • Structural Engineering
  • Historic and Non-historic Bridge Rehabilitation
  • Inspections
  • Load Ratings
  • Construction Support
  • Grant Writing
David Leigh Root Bridge