Sagadahoc Bridge, Road bridge in Bath, United States

The Sagadahoc Bridge is a road crossing that spans the Kennebec River between Bath and Woolwich in Maine. It has four traffic lanes and was designed to accommodate cargo and vessel traffic on the river below.

Construction began in October 1997 under Flatiron Structures/Figg Engineering Group and finished on August 1, 2000, about a month early, at a cost of $46.6 million. The 1927 Carlton Bridge stayed in place as a rail-only crossing, its road deck severed from land on the west side and gated at the east end. Federal funding had to be committed by October 1997, so the Maine Department of Transportation used a design/build process for the first time.

Residents of Bath and Woolwich each submitted suggested names to their town clerk; a committee of five people from each town narrowed these to six options, and residents voted by dropping a penny into jars placed in public buildings. The winning name, Sagadahoc, meaning 'mouth of river', was approved by the Maine Legislature.

The deck is 69 feet wide, with a 6-foot bicycle/breakdown lane and a 6-foot barrier-protected sidewalk on one side only. On the Woolwich side, a pedestrian underpass, added at public request, gives access to the bridge. US 1 traffic runs four lanes across the span.

The bridge uses precast concrete segments that are larger than what is typical in North America. This construction approach helped speed up the building process and reduce overall complexity.