The Charles River was historically used by Native Americans and later colonists for transportation, fishing, and industry. Through the 1800s and 1900s, the river became heavily polluted by factories dumping waste and sewage. Efforts in the late 20th century led to improved water quality and protection of wetlands. Today the river remains an important ecosystem and recreational area, though challenges from invasive species, development, and stormwater runoff persist.

1. Charles River Ecosystem Mark Thompson

3. Satellite Image of the Charles