skip to content

InterCounty Connector Contract B

Environmental stewardship takes center stage in critical transportation project.
  • Heralded as the Best Transportation Project in the Mid-Atlantic.

    Smart transportation provides solutions for travelers and the environment.

Maryland State Highway Administration, Joint Venture with Kiewit Southern Company, G.A. & F.C Wagman, and Corman Construction

Parsons Transportation Group

Montgomery County, Maryland 

Our Role
Highway, Bridge, Traffic, Geotechnical.

7 miles
Construction Cost
$560 million
New Construction
3 years 6 months
  • Helps facilitate efficient travel for an additional 85,000 vehicles per day

  • Reduces average weekday traffic by more than 10 percent  

  • Dramatically reduces travel time by up to 70 percent

  • Provides safe passage for wildlife and protection for watersheds.

Undertaken by the Maryland State Highway Administration, the InterCounty Connector (ICC) is a $1.5 billion, 23-mile, multi-modal, limited access highway that connects I-270 in Montgomery County with I-95 in Prince Georges County, north of Washington, D.C. Constructed along environmentally critical areas, the ICC project aimed to increase community mobility and safety, facilitate the movement of goods and people to and from economic centers, provide cost-effective transportation infrastructure, and help restore the natural environment from previous development impacts.

A $560 million initiative, ICC Contract B was the then-largest contract ever awarded by the state of Maryland. It called for the design and construction of a seven-mile segment of a controlled access, six-lane tolled roadway along with interchanges at MD 182 and MD 650. Contract B included mainline ramps, crossroads, bridges, retaining walls, and more along the most environmentally sensitive areas on the entire ICC corridor. Accordingly, Contract B required substantial provision for the protection of these areas.

What We Did

Gannett Fleming’s dynamic team of design professionals provided innovative highway, bridge, geotechnical, and traffic engineering solutions for Contract B of the ICC project. We led the geotechnical and structure design for two steel overhead structures and two dual mainline structures. The mainline structures included a dual 1,140-foot-long, curved steel plate girder bridge and a dual 1,280-foot-long, pre-stressed concrete bulb-tee beam bridge. Limiting traffic interruptions, our firm also was responsible for the successful development, implementation, monitoring, and evaluation of the transportation management plan and multi-phased maintenance-of-traffic plans.

Gannett Fleming optimized our designs with a keen eye on avoiding or minimizing environmental issues at every step of the project. Key design elements helped reduce the project’s environmental impact and concerns were resolved during the proposal stage through our alternative technical concept process. For example, our highway team balanced earthwork from the large waste project, and our bridge and geotechnical teams used concrete drilled shafts for the bridges’ pier foundations and columns.

Key Features

  • Seven miles of controlled-access for six lanes of traffic

  • Five dual, multi-span mainline bridges

  • Four two-span overhead bridges

  • One overhead single-point urban interchange

  • Two roadway interchanges

  • Noise walls with architectural elements

  • Wildlife passage structures and control features.

Sustainability Features & Outcomes

  • Permanent 8-foot-high fence to protect deer

  • Extensive stormwater management design to protect watersheds traversed by roadway

  • Above ground retention basins designed to minimize thermal impact to native fish species when water is discharged

  • Escape ramps built for wildlife to escape highway right-of-way

  • Culverts designed for fish and small mammal passage.

Awards & Recognition

  • Silver Partnering Award, 2013, Maryland Quality Initiative, Awards of Excellence

  • Best Transportation Project, 2012, ENR MidAtlantic, Best Projects of 2012

  • Exemplary Ecosystem Initiatives Award, 2012, Federal Highway Administration, Environmental Excellence Awards

  • Environmental Excellence Award, 2012, American Road & Transportation Builders Association, Globe Awards.

Similar Projects: Transportation: Bridges, Project Delivery: Design-Build, Geotechnical, Transportation: Highways, Transportation: Operations, ITS & Traffic, Project Delivery, Transportation