Navy Run is a 4.59 mi (7.39 km) long 1st order tributary to Muddy Creek in Crawford County, Pennsylvania.

[1] Navy Run rises about 0.25 miles southwest of Steuben Corners, Pennsylvania, and then flows north and northwest to join Muddy Creek about 2 miles southeast of Little Cooley, Pennsylvania.

[3] Navy Run drains 3.70 square miles (9.6 km2) of area, receives about 45.2 in/year of precipitation, has a wetness index of 446.28, and is about 41% forested.

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