| Thoms Run | |
| Name Other: | Tributary to Chartiers Creek |
| Map Size: | 300 |
| Pushpin Map: | USA Pennsylvania#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Thoms Run mouth |
| Pushpin Map Alt: | Map of Thoms Run mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | Allegheny |
| Length: | 3.05miles[1] |
| Discharge1 Location: | Chartiers Creek |
| Discharge1 Avg: | 3.64cuft/s at mouth with Chartiers Creek[2] |
| Source1: | Robinson Run divide |
| Source1 Location: | about 0.25 miles north of Beechmont, Pennsylvania |
| Source1 Coordinates: | 40.3978°N -80.1639°W[3] |
| Source1 Elevation: | 1110feet[4] |
| Mouth: | Chartiers Creek |
| Mouth Location: | Presto, Pennsylvania |
| Mouth Coordinates: | 40.3719°N -80.12°W |
| Mouth Elevation: | 801feet[5] |
| Progression: | Chartiers Creek → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Ohio River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | Nike Site Road, Thomas Run and Oakdale Road, Summerfield Estates Drive, Walnut Lane, Thomas Run and Oakdale Road, Monteverdi Drive, Thoms Run Road, Pinch Road, Bridge Street, Presto-Sygan Road |
Thoms Run is a 3.05miles long 2nd order tributary to Chartiers Creek in Allegheny County, Pennsylvania.
Thoms Run rises about 0.25 miles north of Beechmont, Pennsylvania and then flows southeasterly to join Chartiers Creek at Presto.[5]
Thoms Run drains of area, receives about 38.4 in/year of precipitation, has a wetness index of 308.49, and is about 43% forested.[2]