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In November 2005, the City of Langley awarded the Langley Road and Bridge partnership, of which ISL was a member, the design build contract for the new 204th Street overpass. The project scope called for a four-lane grade separated structure over the Langley Bypass, CP Railway, and Southern Railway spur line with approach roads including accommodation for pedestrians and cyclists.

ISLs assignment included the design of roadways, utility relocations, traffic analysis, coordination with other disciplines, and construction supervision. The project schedule as established meant that both design and construction occurred simultaneously.

The efforts to put a railway overpass in Langley date back 20 years or more. The increasing rail activity due to the Port expansions meant longer waits for drivers and emergency services. The solution was to build an overpass that started at Logan Avenue in the south and ended at 62nd Avenue in the north. The project was funded by four levels of government and crossed through three jurisdictions.

The overpass is a twelve span, 420 meter long bridge structure with lightweight fill bridge abutments to minimize long term settlements. Bicycle lanes in each direction were provided on the overpass and a separate bridge structure accommodated pedestrians. Right-in-right-out access was provided from the Langley Bypass to 62nd Avenue utilizing at grade one-way lanes on either side of the bridge abutment. Similarly right-in-rightout access from Logan Avenue to Duncan Way was provided to maintain access to adjacent private developments. In fact, Duncan Way is underneath and parallel to the 204th Street overpass for several bridge spans.

The project was completed approximately $1 million under the $36.9 million budget and four months ahead of schedule when it was opened in May 2007. The overpass forms an integral part of the regional road and transit network in Langley. It also served to reduce traffic congestion on 200th Street, improved capacity and safety of the Langley Bypass, and provided emergency vehicles unobstructed access caused by railway activity.