Trimountain

Trimountain
Trimountain west facing side
Highest point
Elevation	(est.) 760 ft (230 m)
Parent peak	41° 27' 37"N, 72° 44' 10"W
Coordinates	41°27′37″N 72°44′10″W / 41.46028°N 72.73611°W / 41.46028; -72.73611Coordinates: 41°27′37″N 72°44′10″W / 41.46028°N 72.73611°W / 41.46028; -72.73611
Geography
Location	Durham and Wallingford, Connecticut
Parent range	Metacomet Ridge
Geology
Age of rock	200 Ma
Mountain type	Fault-block; igneous
Climbing
Easiest route	Mattabesett Trail

Trimountain or Tri-mountain, est. 760 feet (230 m), is a traprock mountain located 6 miles (10 km) southeast of Meriden, Connecticut. It is part of the narrow, linear Metacomet Ridge that extends from Long Island Sound near New Haven, Connecticut, north through the Connecticut River Valley of Massachusetts to the Vermont border. Trimountain is known for its scenic cliff faces, unique microclimate ecosystems, and rare plant communities. The mountain is traversed by the 51-mile (82 km) Mattabesett Trail.

Trimountain is located in Durham and Wallingford, Connecticut. It takes its name from its overall triangular shape, its three southern pinnacles, and the three notches between the pinnacles. A prominent landscape feature that rises 500 feet (150 m) above the surrounding valleys, Trimountain is roughly 1.5 miles (2.4 km) long by 1 mile (1.6 km) wide, although the steepness of the terrain makes the actual square mileage much larger. Although Trimountain has been subject to intensive quarrying, which has obliterated much of the northwestern face of the mountain, the Mattabesett Trail still traverses the southern pinnacles and the wooded eastern side of the mountain.

The Metacomet Ridge continues north from Trimountain as Besek Mountain and south as Fowler Mountain. The east side of Trimountain drains into the Coginchaug River, thence to the Connecticut River and Long Island Sound; the west side drains into the Muddy River, thence into the Quinnipiac River and Long Island Sound.