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Kent’s Island Bridge Crossing and Salt Marsh Restoration

MA Division of Ecological Restoration - Newbury, MA

CLE Engineering provided the MA Division of Ecological Restoration (DER) structural engineering design services for the Kent’s Island Creek Restoration project. A replacement of the Kent’s Island Bridge off Hay Street in Newbury, MA is a component of the Kent’s Island Creek Salt Marsh Restoration Project. The site is an approximately 47 acre salt marsh located up-gradient from tributaries to the Little and Parker Rivers in Newbury, Massachusetts. The existing deteriorated bridge has been condemned and provides the only vehicular access to Kent’s Island. The new bridge will restore vehicular access to Kent’s Island and improved tidal flushing to the upper marsh while providing adequate storm and flood protection for the project site.

The location of the bridge in a salt marsh and the requirement that it be designed for the loads from haying and logging trucks provided challenging design constraints. CLE provided a structural engineering design for a pile supported bridge suited for heavy loads with sheet pile abutments to provide a wider channel for improved tidal exchange. Permit level plans were prepared to provide existing and proposed conditions views, excavation and grading details, soil erosion and sediment control, and a planting plan.  Additional construction details include the structural steel components, wood decking and railing, channel profile and recommended approaches for water control during construction, construction staging areas and construction sequencing. A material quantities list and  the construction cost estimate were also provided.