Federal Run is a 6.88 mi (11.07 km) long 3rd order tributary to Muddy Creek in Crawford County, Pennsylvania.

[1] Federal Run rises about 0.25 miles north-northwest of Kings Corners, Pennsylvania, and then flows southerly to join Muddy Creek about 0.5 miles north-northwest of Little Cooley, Pennsylvania.

[3] Federal Run drains 14.29 square miles (37.0 km2) of area, receives about 45.6 in/year of precipitation, has a wetness index of 442.71, and is about 43% forested.

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