Peters Creek Watershed General DescriptionThe Peters Creek Watershed encompasses an area of approximately 50 square miles in southwestern Allegheny County and northeastern Washington County. Peters Creek, the major surface stream in the watershed, is 16.2 miles long. Its elevation is about 1200 feet above sea level at its headwaters near Thomas in Washington County and 719 feet at Clairton in Allegheny County where it discharges into the Monongahela River. Rocky Point is the highest elevation in the watershed at 1378 feet above sea level. It is located in the northwest corner of the watershed in Bethel Park and is also the highest point in Allegheny County.
Peters Creek flows basically from west to east along the steeply sloped southern border of the watershed. Most of the watershed's area and all of Peters Creek's major tributaries occur north of the mainstem. These tributaries flow generally north to south; creating a series of steep ridges and valleys from the Mon River west. This land pattern has had a tremendous influence on transportation and development within the watershed. Notice that most of the roads in the watershed run north to south and that very few run east to west. The steep slopes and narrow valleys have made development difficult in many areas. Most development has occurred in the stream floodplains and on the ridges separating the subwatersheds.