The Pleasant River is a 13.1mi tributary of the Presumpscot River in the U.S. state of Maine.The Pleasant River originates in the town of Gray and parallels U.S. Route 202 as it flows southwesterly through the town of Windham to discharge into the Presumpscot River upstream of the village of South Windham. With the exception of a few cascades over exposed bedrock, the river has a fairly low gradient through the Presumpscot Formation of silt and clay marine mud with localized sandy lenses. Through the center of Windham, the river cuts through end moraines of glacial till, sand and gravel.Little Sebago LakeLittle Sebago Lake extends from western Gray into northern Windham, and is fed by tributaries originating in eastern Raymond. Public access is available from Mount Hunger Road in Windham. The lake originally drained westerly into Sebago Lake through Boody Meadow and Outlet Brook, but was diverted into the Pleasant River for early water power projects. The lake offers good habitat for smallmouth bass, largemouth bass and chain pickerel. Deep water oxygen deficiencies limit summer habitat for trout; but brown trout are able to survive in the thermocline at a depth of approximately 7m.
