Bridge over the Androscoggin River

Bethel, ME

Stephens Associates Consulting Engineers (SA) evaluated shore (abutment) and river (pier) geotechnical conditions and designed pile foundations for this 400-foot, 3-span river crossing bridge owned by the City of Bethel, and funded by Maine Department of Transportation, Multimodal Division. SA evaluated subsurface conditions at river piers using a barge-support drill rig and performed borings for the new abutments by truck-mounted drill rig. Using the data obtained, and AASHTO guidelines, SA designed foundations for this large bridge traversing the Androscoggin - one of Maine’s most destructive rivers - to resist scour and large ice forces. These issues governed design and construction recommendations. The Bridge is adjacent to the existing US Route 2 Bridge and carries an existing recreation (bicycle, pedestrian and snowmobile) trail over the Androscoggin River at this dangerous location, and also provides emergency vehicle access.