Pennbrook Run is a long second-order tributary to Foster Brook. This is the only stream of this name in the United States.

Variant names According to the Geographic Names Information System, it has also been known historically as: Foster Brook

Course Pennbrook Run rises about 0.5 miles southwest of Nichols Run, New York and then flows southwest to meet Foster Brook at Gilmore, Pennsylvania.

Watershed Pennbrook Run drains of area, receives about of precipitation, and is about 93.93% forested.

See also List of rivers of Pennsylvania

References