| Dennison Fork | |
| Name Other: | Tributary to Fish Dam Run |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Map Caption: | Location of Dennison Fork mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Clinton |
| Length: | 3.03miles[1] |
| Discharge1 Location: | Fish Dam Run |
| Discharge1 Avg: | 5.24cuft/s at mouth with Fish Dam Run[2] |
| Source1: | divide of East Branch Big Run and Swamp Branch |
| Source1 Location: | about 6 miles south-southwest of Renovo, Pennsylvania |
| Source1 Coordinates: | 41.2345°N -77.7844°W[3] |
| Source1 Elevation: | 2070feet |
| Mouth: | Fish Dam Run |
| Mouth Location: | about 6 miles southwest of Renovo, Pennsylvania |
| Mouth Coordinates: | 41.2506°N -77.8369°W |
| Mouth Elevation: | 1037feet |
| Progression: | Fish Dam Run → West Branch Susquehanna River → Susquehanna River → Chesapeake Bay → Atlantic Ocean |
| River System: | West Branch Susquehanna River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | none |
Dennison Fork is a stream located northwest of Lock Haven, about 6.9 miles from Renovo in Noyes Township, Pennsylvania, in the United States.[4] The stream is located south east of Cooks Run.[4] The Dennison Fork branches off from the Fish Dam Run stream, which branches off from the south side of the West Branch Susquehanna River.
The Dennison Fork is located along the Chuck Keiper Trail within the Sproul State Forest.[5]
On May 31, 1985, a tornado ripped through North Central Pennsylvania. As a result, over 8,000 acres of forest land in the Sproul State Forest was flattened. The Dennison Fork Trail, located on the Chuck Keiper Trail was damaged severely. As a result, the trail in this area has been relocated.[5] The only access to the Chuck Keiper Trail is via Pennsylvania Route 144, through the vastly underpopulated and lonely plateau between Renovo and Snow Shoe, Pennsylvania.
The Dennison Fork was most likely named after the Dennison family that settled and resided in Clinton County, Pennsylvania as early as the 1840s. The Dennison family moved between Leidy, Keating and Noyes Townships in Clinton County, but maintained possession of a parcel of land on the banks of the West Branch Susquehanna River in Noyes Township, known as the Dennison tract.[6]