Lake Dennison is a section of the Army Corps of Engineers Birch Hill Flood Control Project. The DCR, via Otter River State Park staff, manages 4,221 acres of Corp land for recreational use. Located in Winchendon, the park has 150 campsites. There is a swimming beach on Lake Dennison.

great for horse's, wide clean, we'll marked. parking by the beach area is not allowed. best to go before Memorial day and after Labor day.