Rainbow Cove is a popular destination for boaters and anglers who want to enjoy the scenic beauty of Wachusett Reservoir. The cove is located near Gate 36, which provides access to the water and a parking area. The cove is named for the rainbow trout that are stocked in the reservoir.

Wachusett Reservoir, along with the Quabbin Reservoir and Ware River, is an unfiltered source of high-quality water for the Massachusetts Water Resources Authority water supply system. The 65-billion-gallon reservoir covers 108 square miles with 37 miles of shoreline. Recreational activities are regulated and limited to protect 3 million people’s drinking water.