Black Rock Lake, Thomaston, Conn.

Black Rock Lake, Thomaston

ANNOUNCEMENT: U.S. Army Corps of Engineers, New England District Recreation Sites Mask Policy

The mask policy at U.S. Army Corps of Engineers, New England District recreation sites is based on local and state-specific guidance and requirements. Visitors to our parks and facilities need to ensure they are following the latest applicable local and state guidance.

Recreation Facilities/Activities

The U.S. Army Corps of Engineers and State of Connecticut Department of Energy and Environmental Protection (DEEP) welcome you to Black Rock Lake. An estimated 150,000 visitors annually enjoy hiking, fishing and hunting on the 319 acres of land and water at Black Rock Lake.

Opportunities for recreation at Black Rock Lake include a 21-acre recreation pool that is open seasonally for fishing and non-motorized boating. Coast Guard approved life jackets are required.

The lake and brook are stocked with brown, rainbow and brook trout by the State of Connecticut. The lake also contains largemouth and smallmouth bass, pickerel, perch, bullhead and bluegill.

Reservoir lands offer the public opportunities for hunting. Refer to the Connecticut hunting guide for more information. A portion of the 35-mile long Mattatuck Blue Trail System crosses through the reservoir land.

An overlook area is provided at the top of the dam. Camping, swimming and day use activities are available at the nearby Black Rock State Park on U.S. Route 6.

Visitors spend an estimated $0.95 million within 30 miles of the lake each year. And, an estimated 27 jobs in the local community are supported by visitors to Black Rock Lake.

Updated: May 25, 2021




  • Please obey posted hours of operation, which change seasonally.
  • All pets must be in the owner's control and on a leash of six feet or physically restrained.           
  • Please, no parking in front of yellow gates.
  • Black Rock Lake is Federally owned/operated by the U.S. Army Corps of Engineers and does not offer recreational swimming. However, Black Rock State Park, owned/operated by the State of Connecticut, does.  
  • Help keep Black Rock Lake clean, Carry-out what you Carry-in.

- Updated: October 24, 2022




Black Rock Lake Office
350 Old Branch Road
Thomaston, CT 06787
Phone: (860) 283-4900
Fax: (860) 283-1078
Black Rock Lake Directions