| Foster Run | |
| Name Other: | Tributary to East Branch Tunungwant Creek |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Map Caption: | Location of Foster Run mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | McKean |
| Subdivision Type4: | Borough |
| Subdivision Name4: | Lewis Run |
| Length: | 1.78miles[1] |
| Discharge1 Location: | East Branch Tunungwant Creek |
| Discharge1 Avg: | 2cuft/s at mouth with East Branch Tunungwant Creek[2] |
| Source1: | Kissem Run divide |
| Source1 Location: | about 1.5 miles northwest of Lewis Run, Pennsylvania |
| Source1 Coordinates: | 41.8811°N -78.6858°W[3] |
| Source1 Elevation: | 2180feet |
| Mouth: | East Branch Tunungwant Creek |
| Mouth Location: | Lewis Run, Pennsylvania |
| Mouth Coordinates: | 41.8767°N -78.6589°W |
| Mouth Elevation: | 1532feet |
| Progression: | East Branch Tunungwant Creek → Tunungwant Creek → Allegheny River → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Allegheny River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | unnamed road (x2), US 219, Cam-Hay Drive |
Foster Run is a 1.78miles long first-order tributary to East Branch Tunungwant Creek.[1]
Foster Run rises about northwest of Lewis Run, Pennsylvania, and then flows east-southeast to meet East Branch Tunungwant Creek at Lewis Run.
Foster Run drains of area, receives about of precipitation, and is about 85.27% forested.[2]