Description: The Montour Run Watershed is located in western Allegheny County, Pennsylvania within portions of Findlay, Moon, Robinson, and North Fayette Townships as well as Coraopolis Borough. Montour Run originates at the confluence of the North and South Forks and flows about 12.8 miles in a general northeasterly direction. Major tributaries of Montour Run include Enlow Run, McClarens Run, Milk Run, Meeks Run, Trout Run and Salamander Run. The approximately 36.6-square mile watershed has long been dominated by the Pittsburgh International Airport as well as by bituminous coal mining activities, woodlands, golf courses, small communities, and rural residential housing. In more recent years, however, development has occurred at a very rapid pace both within and adjacent to the watershed including the construction of housing plans, retail and office buildings, light industrial complexes and a major highway. Despite developmental pressures Montour Run is still largely a scenic, undeveloped, wooded, steep-sloped, flood-prone valley. An 11.5-mile long reach of the former Montour Railroad has been converted to a popular hiking trail and bikeway for recreational enjoyment of the watershed.