|The Assabet River is a small river about 20 miles (30 km) west of Boston, Massachusetts.|
The Assabet arises at a swampy area in Westborough and flows northeast 31 miles, falling 320 feet through the towns of Northborough, Marlborough, Berlin, Hudson, Stow, Maynard, Acton, and finally Concord where it merges with the Sudbury River at Egg Rock to form the Concord River. There are 9 dams along the Assabet, and over 40 bridges cross or once crossed the river. Its watershed covers 177 square miles (458 km²). The Assabet Marshes (in Stow) total about 900 acres (3.6 km²), and the Assabet River National Wildlife Refuge and environs (in Stow, Maynard, Sudbury, and Marlborough) totals about 2600 acres (11 km²).
Nathaniel Hawthorne wrote in its praise: "Rowing our boat against the current, between wide meadows, we turn aside into the Assabeth. A more lovely stream than this, for a mile above its junction with the Concord, has never flowed on earth."
Beginning in 2008, a group of local flyfishermen began stocking the river with German Brown trout in order to drum up local interest in the river and provide themselves with a place to fish.