Charles River Watershed Association
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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accordance with the MA Department of Public Health (DPH), a cyanobacteria (blue-green algae) advisory has finally been rescinded for the Charles River between the Mass Ave Bridge and New Charles River Dam. This bloom persisted well into winter, almost 6 months in duration, with one week of dissipation in July. It was one of many impacts we saw on the river this year from drought and climate change.
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Charles River Watershed Association
190 Park Rd, Weston, MA 02493
t (781) 788-0007     e charles@crwa.org

​© 2021
Donate
  • About
    • Charles River
    • Staff and Board
    • Employment & Internships
    • Contact Us
  • Our Work
    • Blue Cities
    • Climate Change
    • River Science
    • Advocacy
    • CRWA Projects
    • Project Resources
  • News
    • River Current
    • Press
  • Education
    • Request a Visit
    • Classroom Resources
  • Get Involved
    • Virtual Events
    • Events
    • Volunteer
  • Donate
    • Support CRWA
    • Campaign for the Charles River
    • Planned Giving
    • Financial Information
    • Shop CRWA