H&H is providing comprehensive engineering services for the rehabilitation of the East Haddam Swing Bridge (CTDOT Bridge 1138) for the Connecticut Department of Transportation. We are currently leading the design phase, developing bridge rehabilitation designs, including comprehensive structural, mechanical, and electrical repairs and upgrades to ensure the continued reliable service of this historically significant and iconic crossing of the Connecticut River.

We prepared a complete load rating for the swing and approach spans during the preliminary phase, including floor system and truss elements. LRFR load ratings of the as-built and as-inspected condition of the bridge in compliance with CTDOT and AASHTO Manual for Bridge Evaluation requirements. Unusual aspects of the structural system were incorporated into the structural assessment. These aspects included the floorbeam connections at non-nodal tie-in points and truss member load variations that are dependent upon swing span end-lift height,

Additional preliminary engineering services included a structural feasibility study for an external sidewalk’s addition to allow pedestrian access across the bridge, which has a narrow 24. 5-foot roadway. The bridge load rating was evaluated for the additional weight of the sidewalk structure and balance materials. Additional strengthening needs were also identified.

Located in East Haddam, CT, and originally constructed from plans dated 1912, the crossing is made using four-spans carrying two lanes of Route 82 traffic over the Connecticut River. Opened in 1913, the steel truss bridge is comprised of a single-span deck truss, a single-span through truss, and a two-span through truss swing span that a 200-foot clear channel for navigation in the main channel.