Flagging Program
CRWA’s Flagging program notifies boaters of current river health during peak recreational season from Watertown to Boston. River health is determined based on bacteria level models and sample results, notification of combined sewer overflows, and presence of cyanobacteria blooms.
CRWA’s Flagging Program has ended for the 2020 season and will resume in 2021. View data.
In accordance with the MA Department of Public Health (DPH), a cyanobacteria (blue-green algae) advisory has been posted for the Charles River between the Mass Ave Bridge and New Charles River Dam. Red flags are being flown at Charles River Yacht Club, Union Boat Club, Community Boating, and Paddle Boston at Kendall Square. Public health officials recommend that people and pets avoid contact in areas of algae concentration and rinse thoroughly in the event of contact. The advisory cannot be rescinded until the Department of Public Health collects two consecutive samples, a week apart, with cyanobacteria levels below the DPH threshold.
This page will be updated weekly on Thursdays until the advisory has been lifted. Last updated: 11/19/20.
CRWA’s Flagging Program has ended for the 2020 season and will resume in 2021. View data.
In accordance with the MA Department of Public Health (DPH), a cyanobacteria (blue-green algae) advisory has been posted for the Charles River between the Mass Ave Bridge and New Charles River Dam. Red flags are being flown at Charles River Yacht Club, Union Boat Club, Community Boating, and Paddle Boston at Kendall Square. Public health officials recommend that people and pets avoid contact in areas of algae concentration and rinse thoroughly in the event of contact. The advisory cannot be rescinded until the Department of Public Health collects two consecutive samples, a week apart, with cyanobacteria levels below the DPH threshold.
This page will be updated weekly on Thursdays until the advisory has been lifted. Last updated: 11/19/20.
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