Castleman Run is a 7.54 mi (12.13 km) long 3rd order tributary to Buffalo Creek in Brooke County, West Virginia.

[1] Castleman Run Lake, an impoundment of this stream, is protected as Castleman Run Lake Wildlife Management Area by the State of West Virginia.

According to the Geographic Names Information System, it has also been known historically as:[1] Castleman Run rises about 1 mile north of West Alexander, Pennsylvania, in Washington County and then flows northwest into West Virginia and Ohio County and then Brooke County to join Buffalo Creek at Bethany, West Virginia.

[3] Castleman Run drains 17.04 square miles (44.1 km2) of area, receives about 40.5 in/year of precipitation, has a wetness index of 299.39, and is about 66% forested.

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