Low clearance bridges in Blair County, Pennsylvania
12 spots where an interstate or US highway in Blair County has less than 16 ft of clearance, lowest first. The lowest is 14 ft 7 in on I-99, .25 mi S.Of Altoona. 7 are under 15 ft.
Posted signs and your permit come first. These are the clearances Pennsylvania reported to the federal National Bridge Inventory in 2025. Repaving, snow and new work can lower them.
| Clearance | Where | Highway |
|---|---|---|
| 14 ft 7 in | Under SR 1009 · .25 mi S.Of Altoona · Map | I-99 |
| 14 ft 7 in | Under SR 4001(WMPENN HW) · .1 mi S.Of Tunnel Hill · Map | US-22 |
| 14 ft 7 in | Under SR 3013 · 1 mi S.Of Newry · Map | US-220 |
| 14 ft 7 in | Under SR 1009 · .25 mi S.Of Altoona · Map | US-220 |
| 14 ft 9 in | Under SR 8025 @ Exit 23 · 2 mi S.Of Newry · Map | I-99 |
| 14 ft 9 in | Under SR 8025 @ Exit 23 · 2 mi S.Of Newry · Map | US-220 |
| 14 ft 11 in | Under I-99 / US 220 SBL · .5 mi S.Of Altoona · Map | US-220 |
| 15 ft 5 in | Under I-99 / US 220 NBL · .5 mi S.Of Altoona · Map | US-220 |
| 15 ft 9 in | Under SR 2024 · 1 mi S.Of Sproul · Map | I-99 |
| 15 ft 9 in | Under US 22 EBL · 2.5 mi N.Of Duncansville · Map | US-22 |
| 15 ft 9 in | Under SR 2024 · 1 mi S.Of Sproul · Map | US-220 |
| 15 ft 9 in | Over Norfolk Southern Railroad · 0.4 Mile South of SR 4025 · Map | US-220 |