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Gregs Run is a tributary of Muncy Creek in Lycoming County, Pennsylvania, in the United States. It is approximately 9.3 mi long and flows through Penn Township and Wolf Township.

Course
Gregs Run begins in a valley in Penn Township. It flows north-northeast for a few tenths of a mile before entering a wetland. From this wetland, it flows northwest for several tenths of a mile before turning southwest and passing through another wetland, where it receives an unnamed tributary from the right. From the southwestern edge of the wetland, the stream turns west-southwest for a few miles, passing through an unnamed pond and receiving several unnamed tributaries—one from the left and four from the right. It then turns south-southwest for more than a mile, receiving two unnamed tributaries from the left.

Gregs Run then turns southwest for several tenths of a mile, receiving an unnamed tributary from the right and turning south-southwest for a few miles. In this reach, the stream flows alongside the base of Frantz Hill, receiving two unnamed tributaries from the left and entering Wolf Township before leaving its valley and entering the floodplain of Muncy Creek. After briefly turning south, the stream continues flowing south-southwest, crossing Pennsylvania Route 118. It then turns south-southeast for a few tenths of a mile before receiving its only named tributary, Sugar Run, from the left. The stream then flows south-southeast for several tenths of a mile, receiving an unnamed tributary from the right and one from the left before reaching its confluence with Muncy Creek.

Gregs Run joins Muncy Creek 5.88 mi upstream of its mouth.

Tributaries
Gregs Run has one named tributary, which is known as Sugar Run. Sugar Run joins Gregs Run 0.64 mi upstream of its mouth and its watershed has an area of 9.50 sqmi.

Geography and geology
The elevation near the mouth of Gregs Run is 535 ft above sea level.

Watershed
The watershed of Gregs Run has an area of approximately 18 sqmi. The mouth of the stream is in the United States Geological Survey quadrangle of Hughesville. However, its source is in the quadrangle of Sonestown. The stream also flows through the Picture Rocks quadrangle. Its mouth is located at Hugesville.

History
Gregs Run was entered into the Geographic Names Information System on August 2, 1979. Its identifier in the Geographic Names Information System is 1192561.

A concrete frame bridge carrying township road T-250 over Gregs Run 1.0 mi east of Hughesville was built in 1919 and reconstructed in 1963. A concrete stringer/multi-beam or girder bridge carrying State Route 2073 over the stream 2 mi northeast of Hugesville was built in 1927. A concrete tee beam bridge carrying Pennsylvania Route 118 across the stream was built in 1930, 0.25 mi east of Hugesville, and was reconstructed in 2007. A steel stringer/multi-beam or girder bridge carrying township road T-557 over Gregs Run 0.9 mi east of Bryan Mills was reconstructed in 1970. A bridge of the same type, but carrying T-270 over the stream, was built 0.7 mi southeast of Hughesville in the same year. In 1986, another bridge of this type was built for T-652 1.3 mi southeast of Picture Rocks.

Biology
The drainage basin of Gregs Run is designated as a Coldwater Fishery and a Migratory Fishery.