How healthy are your Sudbury, Assabet, & Concord Rivers?

Overall, the Sudbury-Assabet-Concord (SuAsCo) river system scored a B- in the 2023 River Report Card. The health of the rivers varies by section: the Upper Sudbury scored a C+, the Lower Sudbury scored a B, the Upper Assabet scored a B-, the Lower Assabet scored a B, the Upper Concord scored a B, and the Lower Concord scored a C+.