Longfellow Bridge Wetland


Offshoots and Roux Associates were hired to create a highly aesthetic sedimentation management and constructed wetlands system that fits with the pastoral esplanade park context.

Offshoots, Inc was hired by MassDOT to address the interchanges that access the Longfellow Bridge in both Cambridge and Boston. Instead of marginalized landscapes, MassDOT desired productive phytoremediation landscapes that could cleanse the stormwater from the bridge while also creating a pastoral landscape experience in the context of the esplanade.

Offshoots and Roux Associates designed a highly aesthetic sedimentation management and constructed wetlands system that fits with the context of the historic linear park. The project reduces phosphorus loading in the Charles River Watershed, and utilizes innovative vegetated stormwater management systems for MassDOT to test the effectiveness of natural treatment. In looking to reduced phosphorus loading in the Charles River Watershed, MassDOT sought out a wetlands systems specialist to design a vegetated stormwater management system at the Longfellow Bridge in Boston. The project includes signage that describes how the system functions to remove not only phosphorus but heavy metals and other nutrients found in the bridge’s stormwater runoff. Since this project is highly visible and is a preliminary test for the effectiveness of natural treatment systems for Mass DOT, the contract includes ongoing monitoring and will serve as a model for future green infrastructure roadway improvements.

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