Ralston Run is a 1.68 mi (2.70 km) long 1st order tributary to Dutch Fork in Washington County, Pennsylvania.

Ralston Run rises about 2 miles southwest of Budaville, Pennsylvania, in Washington County and then flows southeast then northeast to join Dutch Fork about 1 mile south-southwest of Budaville.

[3] Ralston Run drains 1.64 square miles (4.2 km2) of area, receives about 40.4 in/year of precipitation, has a wetness index of 286.81, and is about 68% forested.

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