Gridley Mountain, 2211 feet (673.9 m), is the third highest elevation in the state of Connecticut

Connecticut

Connecticut is a state in the New England region of the northeastern United States. It is bordered by Rhode Island to the east, Massachusetts to the north, and the state of New York to the west and the south .Connecticut is named for the Connecticut River, the major U.S. river that approximately...

. The mountain, part of the Taconic Range

Taconic Mountains

The Taconic Mountains or Taconic Range are a physiographic section of the larger New England province and part of the Appalachian Mountains, running along the eastern border of New York State and adjacent New England from northwest Connecticut to western Massachusetts, north to central western...

, has no official trail and is located on private property. The Mount Washington

Mount Washington, Massachusetts

Mount Washington is a town in Berkshire County, Massachusetts, United States. It is part of the Pittsfield, Massachusetts Metropolitan Statistical Area. The population was 130 at the 2000 census, making it the smallest town in Berkshire County and, after Gosnold and Monroe, the third smallest in...

 Road passes the mountain from the west.

Gridley Mountain is located in Salisbury, Connecticut

Salisbury, Connecticut

Salisbury is a town in Litchfield County, Connecticut, United States. The town is the northwest-most in the State of Connecticut. The MA-NY-CT Tri-State Marker is located just on the border of Salisbury...

. It is flanked to the northwest by Round Mountain

Round Mountain

-United States:Communities*Round Mountain, California*Round Mountain, Nevada*Round Mountain, TexasMountains*Round Mountain *Round Mountain * Round Mountain in Gallatin County, Montana* Round Mountain in Mineral County, Montana...

, to the northeast by Bear Mountain

Bear Mountain (Connecticut)

Bear Mountain, is prominent peak of the southern Taconic Mountains. It lies within the town of Salisbury, Connecticut, in the United States, and is the highest mountain summit in the state of Connecticut. The highest point in the state, however, is located on the south slope of Mount Frissell to...

, and to the west by Brace Mountain

Brace Mountain

Brace Mountain is the peak of a ridge in the southern Taconic Mountains, near the tripoint of the U.S. states of New York, Connecticut and Massachusetts...

. The west side of the mountain drains into Riga Lake and South Pond, then into Wachocostinook Brook, Salmon Creek, the Housatonic River

Housatonic River

The Housatonic River is a river, approximately long, in western Massachusetts and western Connecticut in the United States. It flows south to southeast, and drains about of southwestern New England into Long Island Sound...

, and Long Island Sound

Long Island Sound

Long Island Sound is an estuary of the Atlantic Ocean, located in the United States between Connecticut to the north and Long Island, New York to the south. The mouth of the Connecticut River at Old Saybrook, Connecticut, empties into the sound. On its western end the sound is bounded by the Bronx...

. The east side drains into Brassie Brook, Ball Brook, Moore Brook, then into the Housatonic River.