Spruce Run (Buffalo Creek)

Spruce Run
Spruce Run looking upstream
Basin features
Main source	narrow valley in eastern Hartley Township, Union County, Pennsylvania between 1,760 and 1,780 feet (536 and 543 m)
River mouth	Buffalo Creek on the border between Buffalo Township, Union County, Pennsylvania and Kelly Township, Union County, Pennsylvania 482 ft (147 m) 40°58′38″N 76°58′43″W / 40.97715°N 76.97849°W / 40.97715; -76.97849Coordinates: 40°58′38″N 76°58′43″W / 40.97715°N 76.97849°W / 40.97715; -76.97849
Progression	Buffalo Creek → West Branch Susquehanna River → Susquehanna River → Chesapeake Bay
Basin size	27.2 sq mi (70 km2)
Tributaries	Right: Black Run, Muddy Run
Physical characteristics
Length	14 mi (23 km)

Spruce Run is a tributary of Buffalo Creek in Union County, Pennsylvania, in the United States. It is approximately 14 miles (23 km) long and flows through Hartley Township, Lewis Township, West Buffalo Township, White Deer Township, Buffalo Township, and Kelly Township. The watershed of the stream has an area of 27.2 square miles (70 km²). The stream has two named tributaries: Black Run and Muddy Run. It is not designated as an impaired waterbody, but it is affected by sediment and nutrients.

Spruce Run mainly flows through mountainous terrain and the Spruce Run Reservoir is in its watershed. The watershed of its main stem is mostly forested. There used to be a mill near the stream's mouth and lumbering was done in the surrounding area. A number of bridges have been constructed across it. Part of the stream is designated as Exceptional Value waters and a Migratory Fishery, while the other part is a High-Quality Coldwater Fishery and a Migratory Fishery. The stream has been described as an "excellent" site for angling.

Spruce Run begins in a narrow valley in eastern Hartley Township. It flows east-northeast for a few miles, heading along the northern side of Sand Mountain and entering Lewis Township. The stream then turns north for several tenths of a mile and passes by Round Knob before turning east-northeast for several more miles. In this reach, the stream passes near Round Knob, Long Knob, Buffalo Mountain, and Catahannes Crown, while exiting Lewis Township and passing through West Buffalo Township. It eventually turns east and begins flowing along the border between Buffalo Township and White Deer Township. In this reach, it passes by the Spruce Run Reservoir. The stream then turns south-southwest for a few miles as its valley becomes much shallower. It begins flowing along the border between Buffalo Township and Kelly Township, where it receives Black Run, its first named tributary, from the . Several tenths of a mile after this, it turns southeast and receives Muddy Run, its second and final named tributary, from the right. A few tenths of a mile further downstream, the stream reaches its confluence with Buffalo Creek.