Trimountain or Tri-mountain, est. , is a

traprock mountain Traprock or trap rock may refer to: * Trap rock, form of igneous rock exhibiting polygonal vertical fractures * Traprock Important Bird Area, Queensland, Australia * Trap Rock River, Michigan, USA * Walter E. Traprock, pseudonym of American archi ...

located southeast of

Meriden, Connecticut Meriden is a city in New Haven County, Connecticut, United States, located halfway between the regional cities of New Haven, Connecticut, New Haven and Hartford, Connecticut, Hartford. In 2020, the population of the city was 60,850.Metacomet Ridge that extends from

Long Island Sound Long Island Sound is a marine sound and tidal estuary of the Atlantic Ocean. It lies predominantly between the U.S. state of Connecticut to the north and Long Island in New York to the south. From west to east, the sound stretches from the Eas ...

near

New Haven, Connecticut New Haven is a city in the U.S. state of Connecticut. It is located on New Haven Harbor on the northern shore of Long Island Sound in New Haven County, Connecticut and is part of the New York City metropolitan area. With a population of 134,02 ...

, north through the Connecticut River Valley of

Massachusetts Massachusetts (Massachusett language, Massachusett: ''Muhsachuweesut assachusett writing systems, məhswatʃəwiːsət'' English: , ), officially the Commonwealth of Massachusetts, is the most populous U.S. state, state in the New England ...

to the

Vermont Vermont () is a state in the northeast New England region of the United States. Vermont is bordered by the states of Massachusetts to the south, New Hampshire to the east, and New York to the west, and the Canadian province of Quebec to ...

border. Trimountain is known for its scenic cliff faces, unique

microclimate A microclimate (or micro-climate) is a local set of atmospheric conditions that differ from those in the surrounding areas, often with a slight difference but sometimes with a substantial one. The term may refer to areas as small as a few squ ...

ecosystems, and rare plant communities. The mountain is traversed by the

Mattabesett Trail The Mattabesett Trail is a long, hook-shaped Blue-Blazed Trails, blue-blazed hiking trail in central Connecticut and a part of the New England National Scenic Trail. One half of the trail follows the high traprock ridges of the Metacomet Ridge, ...

Geography

Trimountain is located in Durham and

Wallingford, Connecticut Wallingford is a town in New Haven County, Connecticut, United States, centrally located between New Haven and Hartford, and Boston and New York City. The population was 44,396 at the 2020 census. The community was named after Wallingford, in En ...

. 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 above the surrounding valleys, Trimountain is roughly long by 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

still traverses the southern pinnacles and the wooded eastern side of the mountain. The Metacomet Ridge continues north from Trimountain as

Besek Mountain Besek Mountain (Alternate spelling: Bessic Mountain) also known as Black Mountain, est. , is a traprock mountain ridge located southeast of Meriden, Connecticut. It is part of the narrow, linear Metacomet Ridge that extends from Long Island Soun ...

and south as

Fowler Mountain Fowler Mountain, est. , is a traprock mountain located southeast of the center 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 Connect ...

. The east side of Trimountain drains into the

Coginchaug River The Coginchaug River in Connecticut, with a watershed including 39 sq mi of forests, pastures, farmland, industrial, and commercial areas, is the main tributary of the Mattabesset River. It is 16.1 mi long, and the river flows northwards fro ...

, thence to the

Connecticut River The Connecticut River is the longest river in the New England region of the United States, flowing roughly southward for through four states. It rises 300 yards (270 m) south of the U.S. border with Quebec, Canada, and discharges at Long Island ...

and Long Island Sound; the west side drains into the Muddy River, thence into the Quinnipiac River and Long Island Sound.

Geology and ecology

Trimountain, like much of the Metacomet Ridge, is composed of

basalt Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial ...

, also called traprock, a

volcanic A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates a ...

rock. The mountain formed near the end of the

Triassic Period The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ...

with the rifting apart of the

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

n continent from

Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...

and

Eurasia Eurasia (, ) is the largest continental area on Earth, comprising all of Europe and Asia. Primarily in the Northern and Eastern Hemispheres, it spans from the British Isles and the Iberian Peninsula in the west to the Japanese archipelago a ...

Lava Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or un ...

welled up from the rift and solidified into sheets of strata hundreds of feet thick. Subsequent faulting and

earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

activity tilted the strata, creating the cliffs and ridgeline of Trimountain. Hot, dry upper slopes, cool, moist ravines, and mineral-rich ledges of basalt talus produce a combination of

ecosystems on the mountain that support plant and animal species uncommon in greater Connecticut. Trimountain is also an important

raptor Raptor or RAPTOR may refer to: Animals The word "raptor" refers to several groups of bird-like dinosaurs which primarily capture and subdue/kill prey with their talons. * Raptor (bird) or bird of prey, a bird that primarily hunts and feeds on v ...

migration path. (See Metacomet Ridge for more information on the geology and ecosystem of Trimountain).

Conservation and Recreation

Trimountain is used for

hiking Hiking is a long, vigorous walk, usually on trails or footpaths in the countryside. Walking for pleasure developed in Europe during the eighteenth century.AMATO, JOSEPH A. "Mind over Foot: Romantic Walking and Rambling." In ''On Foot: A Histor ...

, cross country skiing, and

snowshoeing Snowshoes are specialized outdoor gear for walking over snow. Their large footprint spreads the user's weight out and allows them to travel largely on top of rather than through snow. Adjustable bindings attach them to appropriate winter footwe ...

. The mountain is traversed by the Mattabesett Trail (maintained by the Connecticut Forest and Park Association), which stretches from the northern end of

Lamentation Mountain Lamentation Mountain, or Mount Lamentation, , is a traprock mountain located north 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 Con ...

, south to

Totoket Mountain Totoket Mountain, with a high point of (est.) above sea level, is a traprock massif with several distinct summits, located northeast of New Haven, Connecticut. It is part of the Metacomet Ridge that extends from the Long Island Sound near New ...

and north again to the Connecticut River. Trimountain State Park, and undeveloped property, is located on the southeastern side of the mountain. A trailhead for the Mattabesett Trail on Trimountain is located at the junction of

Connecticut Route 68 Route 68 is an east–west state highway in the U.S. state of Connecticut connecting the towns of Durham and Naugatuck. Route description Route 68 begins at Route 63 in Naugatuck. After crossing the Naugatuck River, it overpasses the Route ...

and

Connecticut Route 157 Route 157 is a state highway in central Connecticut from northwestern Durham, through Middlefield to Middletown. Route description Route 157 begins as Skeet Club Road at an intersection with Route 68 in the northwestern corner of Durham. It he ...

in Reeds Gap between Trimountain and Besek Mountain, west of Durham center. The ridgeline of Trimountain and its ecosystem is most threatened by quarrying and suburban development. The quarry on the western side of the mountain was approximately as of 2007. In 2000, Trimountain was included in a study by the

National Park Service The National Park Service (NPS) is an agency of the United States federal government within the U.S. Department of the Interior that manages all national parks, most national monuments, and other natural, historical, and recreational propertie ...

for the designation of a new National Scenic Trail now tentatively called the

New England National Scenic Trail The New England National Scenic Trail (NET) is a National Scenic Trail in southern New England, which includes most of the three single trails Metacomet-Monadnock Trail, Mattabesett Trail and Metacomet Trail. After the Metacomet-Monadnock-Mattabe ...

, which would include the

Metacomet-Monadnock Trail The Metacomet-Monadnock Trail (M&M Trail) is a hiking trail that traverses the Metacomet Ridge of the Pioneer Valley region of Massachusetts and the central uplands of Massachusetts and southern New Hampshire. Although less than from Boston and ...

in Massachusetts and the

and

Metacomet Trail The Metacomet Trail is a '' Blue-Blazed'' hiking trail that traverses the Metacomet Ridge of central Connecticut and is a part of the newly designated New England National Scenic Trail. Despite being easily accessible and close to large populatio ...

trails in Connecticut. The Wallingford Land Trust and the Middlesex Land Trust have been active in conserving the viewshed of Trimountain.

References

* Farnsworth, Elizabeth J.
Metacomet-Mattabesett Trail Natural Resource Assessment.
2004. PDF wefile cited November 1, 2007. * ''Connecticut Walk Book: A Trail Guide to the Connecticut Outdoors.'' 17th Edition. The Connecticut Forest and Park Association. Rockfall, Connecticut. Undated. * Raymo, Chet and

Raymo, Maureen E. Maureen E. "Mo" Raymo (born 1959) is an American paleoclimatologist and marine geologist. She is the Co-Founding Dean of the Columbia Climate School, Director of the Lamont–Doherty Earth Observatory of Columbia University, the G. Unger Vetl ...

''Written in Stone: A Geologic History of the Northeastern United States''. Globe Pequot, Chester, Connecticut, 1989.
U.S. Congress ''New England National Scenic Trail Designation Act.''

External links

Connecticut Forest and Park Association

U.S. Congress ''New England National Scenic Trail Designation Act.''

NPS brochure for National Scenic Trail proposal.

{{Mountains of Connecticut Mountains of Connecticut Wallingford, Connecticut Durham, Connecticut Metacomet Ridge, Connecticut Landforms of Middlesex County, Connecticut

Geography

Geology and ecology

Conservation and Recreation

See also

References

External links