The replacement of the Neil R. Underwood Bridge is a major infrastructure project aimed at improving transportation and navigation along NH 1A in Hampton, New Hampshire. The existing bridge, constructed in 1949, is listed on the State Red List due to structural deficiencies. The new bridge will enhance roadway capacity, improve access for bicyclists and pedestrians, and provide greater clearance for maritime traffic.
The new bridge will be a fixed high-level steel girder structure situated west of the existing bridge on a horizontally curved alignment. It will span 1,300 feet with seven spans and feature a wider roadway—38 feet between curbs, including two 11-foot travel lanes and 8-foot shoulders. The bridge will also incorporate two 6-foot sidewalks with designated overlooks, enhancing pedestrian access. Importantly, it will maintain the full 150-foot-wide federal navigational channel with a vertical under-clearance of approximately 48 feet, allowing unhindered passage for all regular maritime users, including dredging equipment from the US Army Corps of Engineers.
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