Point Marion Lock and Dam

Point Marion Lock and Dam, previously known as Lock and Dam Number 8, is one of nine navigational structures on the Monongahela River between Pittsburgh, Pennsylvania and Fairmont, West Virginia. Maintained and built by the U.S. Army Corps of Engineers, the gated dam forms an upstream pool that is 11.2 miles (18.0 km) long, stretching to the base of the Morgantown Lock and Dam. It is located at river mile 90.5 (river kilometer 145.6).

Point Marion Lock and Dam
Looking downstream at Point Marion Lock and Dam.
Location	Dunkard / Springhill townships, Greene County, near Point Marion, Pennsylvania
Coordinates	39°43′38″N 79°54′39″W
Construction began	1923
Opening date	1926
Operator(s)	U.S. Army Corps of Engineers, Pittsburgh District
Dam and spillways
Impounds	Monongahela River
Height	15 ft (4.6 m)
Length	638 ft (194 m)
Reservoir
Total capacity	11,500 acre⋅ft (14,200,000 m3)
Catchment area	2,751 sq mi (7,130 km2)
Surface area	704 acres (285 ha)

There is one lock chamber on the left descending bank of the river at the dam, 84 feet (26 m) wide and 720 feet (220 m) long. The reservoir formed by the dam is also a municipal and industrial water supply.^[1]

Point Marion Lock and Dam Entrance, with the Fort Martin Power Station in the distance.

See also

List of crossings of the Monongahela River