Blackstone River

Blackstone River is a river in the United Sates. It forms in Worcester by the confluence of the Middle River and Mill Brook and flows south for 50 miles (80 km) through Worcester, Massachusetts, to Pawtucket, Rhode Island, where it forms Pawtucket Falls. From this point below it is called the Seekonk River which it flows into. It drains a watershed of approximately 540 sq. miles (1,400 sq km). The Blackstone Valley was a site of early US industrial development, and has left a legacy of pollution. It was characterized by the United States Environmental Protection Agency in 1990 as "the most polluted river in the country with respect to toxic sediments."