Charles River Conservancy Floating Wetland Header Image

Floating Wetlands

The Charles River Floating Wetland explores an ecological intervention to reduce harmful algal blooms in the Charles, which threaten the river’s health and limit the feasibility of swimming. Reducing nutrient pollution remains a vital method for preventing blooms, but this approach depends on increasingly complex solutions. Ecological interventions, like the floating wetland, offer an alternative and complementary strategy. Experiments have shown that for water bodies like the Charles, algal blooms can be understood as a symptom of a broken food chain. Our project aims to strengthen the missing link–zooplankton populations–by providing additional wetland habitat.

We are continuing a multi-year partnership with Northeastern PhD student Max Rome on the research program, are grateful for the in-kind engineering services provided by Foth, and have collaborated with interpretative materials professional Penelope Taylor on engagement and signage. In partnership with MassDCR, we have installed a floating wetland in the Charles River in Cambridge downriver of the Longfellow Bridge. During the island’s two year installation, a Northeastern research group will collect data to understand if adding additional habitat has the hypothesized outcome on the local food chain. The CRC will use the wetland to help the public understand the ecology of the river and ways that we can help make it a healthy and vibrant ecosystem.

For more in-depth information, check out the project’s engagement & education page and research website.

Learn more about the Charles River Floating Wetland with a short introductory video.


The floating wetland is located in the Charles River along Cambridge Parkway, just downriver of the Longfellow Bridge near the mouth of the Broad Canal.

The Floating Wetland with the Cambridge Parkway in the background.
The Floating Wetland with the Longfellow Bridge in the background.


  • Heather and Robert Keane Family Foundation
  • Takeda
  • Metropolitan Area Planning Council
  • The Boston Foundation
  • Foth
  • William Procter Scientific Innovation Fund
  • The Horne Family Foundation
  • McKenzie Family Charitable Trust
  • The Sasaki Foundation  
  • Cell Signaling Technology, Inc.
  • BioMatrix Water
  • CHT Foundation
  • BSA Foundation
  • Paddle Boston

We are grateful to our early donors who made the design, permitting, installation and initial research on our floating wetland possible!  As a multi-year initiative, ongoing support for the research, maintenance and engagement has ensured this project has far ranging impacts—from developing a data-driven expansion of floating wetlands for a healthier river to STEAM educational enrichment activities with youth!

Interested in supporting the continuing impact of this project? Contact Laura Jasinski at


  1. Design, permit, and install a floating wetland to demonstrate the importance (and absence) of shoreline vegetation.
  2. Research the impact on local zooplankton populations and quantify the scale at which water quality could be affected and improved.
  3. Engage the public on the river’s health.
Rendering of floating wetland design by Sasaki.


This project kicked off in the Fall of 2018. Since then, the team has:

  • completed a 9-month residency at the Incubator at Sasaki (check out our storyboard and chapter of the Sasaki Foundation 2018-2019 Design Grant Research publication)
  • determined an optimal modular product for our purposes, manufactured by Biomatrix Water, a leader in the Living Waters Cities movement
  • partnered with an experienced marine engineer, Foth, on the anchoring and installation
  • navigated the complex permitting process that included an Order of Conditions from the Cambridge Conservation Commission, Construction Access and Research permits from MassDCR, a Chapter 91 permit from MassDEP, and submission to the Army Corps.
  • assembled the floating matrix, planted it with 19 species, and installed it into the Charles River (watch a time-lapse of the process!)
  • partnered with Northeastern University on their detailed two-year research program that will study the impacts the wetland has on the local ecology

Have a question or want to learn more? Contact Vanessa Nason,

Lead image by Sasaki and the Sasaki Foundation.