Reconstruction of the Humpback Bridge began in January 2008. The bridge, which had not been renovated since its construction, now carried 75,000 vehicles a day – far more than it was designed for. Improvements included widening the bridge, adding balustrades to separate the sidewalks from the vehicular traffic lanes, and building an underpass through the Columbia Island side landing to allow pedestrians and cyclists to pass through the bridge rather than crossing the parkway. The reconstruction also removed the notorious "hump" in the middle of the bridge. However, the masonry facing of the bridge was retained to protect the historic character of the bridge. The bridge reconstruction was complete in 2011, and the bike/pedestrian underpass opened in November. The underpass connected the Columbia Island Marina and the LBJ Memorial Grove with the Mt. Vernon Trail.