Friday, September 25, 2020. The Friends of the Cobbossee Watershed was founded in 2001 by a group of local residents who were concerned about declining water quality in their lakes. Fun for the whole “family bubble”! Up to 6 guests who live in the same household can board the Tadpole Patrol for an unforgettable excursion. “Kids” of all ages can observe wildlife above and below the water, share lake trivia, and experience water monitoring with professional equipment. $50.00 Cobbosseecontee Lake , also known as Cobbossee Lake , is a lake located in the towns of Litchfield , Manchester , Monmouth , West Gardiner , and Winthrop Maine . It is the largest lake in the Winthrop Lakes Region at 100 feet (30 m) deep, covering about 8.7 square miles (23 km 2 ) in surface area, a length of 9 miles (14 km), and a shoreline of 62 miles (100 km). The word Cobbosseecontee translates to "plenty of sturgeon" in Wabanaki . [2] Cobbossee Lake is known for its coves, inlets, and