SR 504-pa 504 over Six Mile Run
Centre County, Pennsylvania · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 504-pa 504 over Six Mile Run in Centre County, Pennsylvania, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1998, making it 27 years old at the 2025 inventory.
- It carries about 558 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 168 of the 366 inventoried bridges in Centre County rated fair (45.9%); 22 (6.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (40.90897, -78.10453)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 41 ft |
| Location | Six Mile E. Philipsburg |
| NBI structure number | 000000000040185 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Pennsylvania department of transportation.
Busiest bridges in Centre County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 322-us 322 over Access Road #1 | 2001 | 38,785 | Good |
| SR 80-i 80 over South Fork Beech Creek | 1966 | 21,186 | Good |
| SR 3014-us 322 Bus over Slab Cabin Run | 1932 | 20,393 | Fair |
| SR 322-us 322 over Abandoned R.R. Bike Path | 1970 | 19,767 | Fair |
| SR 322-us 322 over SR 3005 | 2001 | 19,767 | Good |
| SR 322-us 322 over Abandoned R.R. Bike Path | 1970 | 19,018 | Fair |
All bridges nearby: Centre County, PA bridge conditions · every bridge in Centre County · Pennsylvania bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.