The Saint Croix River was an early trade corridor to interior Maine and New Brunswick from the Atlantic coast.

Ocean ships could navigate upstream to Calais and St. Stephen; although tidal fluctuation made Eastport a preferred port for deeper draft vessels.

During this conflict Maine, Massachusetts and New Brunswick continued to issue some lumbering permits to the disputed territory.

Dynamite was used as a tool of sabotage to blow up some of the log booms that were strung across the river to catch the recently cut trees.

USGS also maintains a water chemistry monitor at Milltown, Maine (45°10′11″N 67°17′50″W / 45.16972°N 67.29722°W / 45.16972; -67.29722) where the rivershed is 1,455 square miles (3,768 km2).

Currently, New Brunswick Power stakeholders, government officials, the Peskotomuhkati Tribe, locals, and the public are examining this proposed dam removal.

Milltown Dam was built in 1881 by New Brunswick Power and is the oldest operating hydro facility in Canada.

Atlantic Salmon, shad, eels, and alewives would all benefit from this dam's removal and ongoing habitat restoration.