The first segment of MD Route 200, the Intercounty Connector (ICC) project, is under construction to connect development areas between the I-270/I-370 and I-95/ US-1 corridors in Montgomery County, Maryland. This first phase, a $460 million highway project, consists of approximately 7.2 miles of six-lane tolled roadway with the construction of ramps, bridges, retaining walls, drainage and stormwater facilities.
in significant scheduling and cost
The purpose of the federally funded ICC project is to increase community mobility and safety, provide cost effective transportation infrastructure, help restore the natural, human and cultural environments and advance homeland security. Sponsored by the Maryland State Highway Administration and Maryland Transportation Authority, this design-build project will result savings and have minimal impact on the local community.
“Protecting the environment is a first-order priority of the ICC project” said State Highway Administrator Neil J. Pedersen. “Every activity is assessed through the potential impact on the environment”
With this goal of protecting the environment from developmental impacts, bridges that would reduce ground level effects and protect the streams, wetlands and flood plains were essential as was the need to create animal crossings to reduce the impact on wildlife.
Two 228’ long BEBO® precast concrete arch structures with precast headwalls and wingwalls were utilized as stream crossings. The shape of the BEBO structures produces large, open bottoms to span the wetlands and streams with little or no impact to the river bed or surrounding environment. MULTI-PLATE® structures were also used for stream crossings with adjacent cells utilized as deer and wildlife passages. The wildlife tunnels will serve as protection for the animals as well as improving the safety of traveling motorists.
The project runs through one of the most undeveloped areas in
Central Maryland. Therefore, a major requirement for the state
was to ensure effective stormwater management. To address
water quantity requirements, an underground, large-diameter
corrugated metal pipe (CMP) detention system was installed. The
system temporarily detains, and then slowly releases runoff from
the bridge. Water quantity requirements were met by installing
an 8’ x 24’ precast vault configuration of the Stormwater
Management StormFilter®. This is one of the first instances that
the StormFilter was approved for use on a SHA project and it has
paved the way for future State Highway facilities.
Tensar geogrid was used to enhance subgrade strength, support
the extreme loads and help prevent rutting from the constant
passage of equipment on the haul roads. In addition, thousands
of feet of CMP and ULTRA FLO® SRP were utilized as temporary
and permanent culvert crossings beneath the haul roads and for
parallel animal crossings.
ICC is well on its way towards achieving their goals. The first
phase of this project is slated to open in late 2010 and the
remaining phases should be complete in 2012.