Boathouses

Flags

In accordance with the MA Dept. of Public Health (DPH), a cyanobacteria (blue-green algae) advisory has been posted in the Charles River downstream of Massachusetts Avenue (a.k.a. the Harvard Bridge). Red flags are being flown at the Charles River Yacht Club, Union Boat Club, Paddle Boston at Kendall Square, and the Charlesgate Yacht Club. Public health officials recommend that people and pets avoid contact in areas of algae concentration and rinse thoroughly in the event of contact.

For additional information on cyanobacteria blooms, we encourage you to visit the following websites:

https://www.mass.gov/lists/algae-information

https://www.mass.gov/guides/cyanobacterial-harmful-algal-blooms-cyanohabs-water

https://www.cdc.gov/habs/index.html

https://www.epa.gov/cyanohabs

Current Cyanobacteria Bloom Advisories - https://www.mass.gov/alerts/harmful-cyanobacterial-bloom-advisories-in-massachusetts

At this time, it is recommended that you avoid contact with the water. People should rinse off with fresh water immediately if they or their pet comes into contact with the water. If you believe you or your pet is experiencing adverse health effects, contact your doctor or veterinarian immediately. Blue-green algae is extremely toxic to pets.

CRWA’s water quality models are predicting blue flags at all other boathouses, based only on E. coli bacteria predictions.

Blue flag for Community Rowing, Inc.
Community Rowing, Inc.
Blue flag for Newton Yacht Club
Newton Yacht Club
Blue flag for Northeastern's Henderson Boathouse
Northeastern's Henderson Boathouse
Blue flag for Paddle Boston at Herter Park
Paddle Boston at Herter Park
Blue flag for Watertown Yacht Club
Watertown Yacht Club
Blue flag for Cambridge Boat Club
Cambridge Boat Club
Blue flag for Harvard's Weld Boathouse
Harvard's Weld Boathouse
Blue flag for Boston University DeWolfe Boathouse
Boston University DeWolfe Boathouse
Blue flag for Riverside Boat Club
Riverside Boat Club
Red flag for Charlesgate Yacht Club
Charlesgate Yacht Club
Red flag for Charles River Yacht Club
Charles River Yacht Club
Red flag for Paddle Boston at Kendall Square
Paddle Boston at Kendall Square
Red flag for Union Boat Club
Union Boat Club

Map

Below is a map showing the Charles River boathouses with their current flag statuses. Clicking on a flag will show the name of the boathouse.

( Last updated: August 22, 2025 at 11:00 PM )