By A Mystery Man Writer
When it comes to the Charles, a lot depends on the weather. And Massachusetts saw record rainfall last year.
Scientific method - Wikipedia
Boston River Report Cards Reveal Grades Ranging from A to F
2021 Charles River Report Card — Charles River Watershed Association
Long-polluted parts of Boston's major rivers continue to fail
Water quality grades are in for Boston-area rivers: How did the
Diving into the Charles' Dirty History – The Register Forum
Three Boston Area Beaches Closed To Swimming Because Of Bacteria
2021 Charles River Report Card — Charles River Watershed Association
Announcing the 2022 Three Rivers Report Cards — Mystic River
A report card from the 1940's I found at a lake. : r/mildlyinteresting
Charles River cleanup improvements 'stalled,' says annual EPA
Is Charles River Water Quality Improving?