Tydings Memorial Bridge Foundation and Subsurface Repairs


Maryland Transportation Authority


I-95 over the Susquehanna River Harford County, Maryland

Key Challenges & Project Details

  • Project required repairs to the under water foundation of the bridge:
    • Rehabilitation on bridge footings and sub-footings of 10 in-river piers
    • In-river excavation and cofferdam construction
    • Reinforced tremie concrete placement
    • Structural concrete repairs of the pier footings and columns.

Challenges overcome:

  • Remoteness of the site
  • Working in water up to 65 feet deep
  • Crews, equipment and materials transported by boat and barge up to 2 miles from shore
  • Massive fluctuations in river elevation
  • Flooding and hurricane weather conditions
  • Extreme winter weather conditions, with heavy ice packs and high winds
  • Erratic rock elevation
  • Manmade obstructions encountered during excavation
  • Environmental restrictions on work that would disturb the river bottom during the hibernation period of the map turtle
  • Environmental restrictions in place to protect and promote growth of underwater vegetation

Awards Received

  • 2014 MdQI Award of Excellence -Gold Partnering Award
  • 2014 MdQI Award of Excellence -MTA Modal Project Over $5 Million
  • 2014 Pile Driver Contractors Association (PDCA) Project of the Year -Over $5 Million
  • 2014 American Concrete Institute (ACI) Maryland Chapter Excellence in Concrete Award