Lake Warner & the Mill River has a rich history as it is one of the oldest historic landmarks in Hadley, Massachusetts. The Mill River was formed from a dam in 1670 and has been preserved and maintained for decades by a team of dedicated professionals. Our main goal in preservation and maintenance work was to have the area be an oasis for sightseers and bird watchers, foster outdoor recreation like canoeing, be a natural refuge for wildlife, and encourage nature education. We invite you to come visit Lake Warner and Choose Your Own Adventure: