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Montgomery County, MD


Design Completed 2012, Construction Ongoing


Maryland Transportation Authority MTA




Architecture Bridge Designer

The densely wooded site, at a confluence between Rock Creek Park and the historic Georgetown Branch Line rail line, the paired bridge design seeks to mediate between two distinct regional bridge typologies. Bridge types typical of Rock Creek Park, a flat-arch type and monumental-arch type, were merged with an historic through-truss rail typology identical to the Georgetown Branch Line. The final design pairs an arch girder LRT bridge and inverted bowed truss bridge for pedestrians and bicycles. The composition elegantly spans the creek, juxtaposing the weight and formal qualities of the complimentary vernaculars of both respective corridors at this point of convergence. In planning, KGP optimized vertical and horizontal alignments of the LRT and pedestrian and bicycle bridge to minimize the impacts on the delicate wooded hillside and maximize the view corridor along the existing Rock Creek Trail path below.

The Rock Creek Bridge for the Purple Line project undertook a meticulous design process to accommodate both the new Purple Line and a pedestrian bridge. Various alternatives were explored, employing curved shapes aligned with charge transfer and structural diagrams to optimize material efficiency. The study of different shapes allowed for the identification of the most suitable alternative, which was then implemented in the construction phase. This thoughtful approach not only ensured the structural integrity of the bridge but also exemplified a commitment to material efficiency and design optimization for the Rock Creek Bridge on the Purple Line.

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