SR 646-pa 646 over Pennbrook Run
McKean County, Pennsylvania · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 646-pa 646 over Pennbrook Run in McKean County, Pennsylvania, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1930, making it 95 years old at the 2025 inventory.
- It carries about 1,044 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 85 of the 226 inventoried bridges in McKean County rated fair (37.6%); 40 (17.7%) 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 September 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 → (41.97318, -78.5645)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Concrete slab |
| Length | about 40 ft |
| Location | Gilmore |
| NBI structure number | 000000000025458 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 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 McKean County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 219-us 219 over SR 346 and SR 4013 | 1977 | 11,194 | Fair |
| SR 219-us 219 over SR 4002 | 2003 | 9,406 | Good |
| SR 219-us 219 over Sheppard Run | 1992 | 8,523 | Good |
| SR 219-us 219 over Mill St - B&p Railroad | 2006 | 8,482 | Good |
| SR 346-pa 346 over Tunungwant Creek | 1997 | 8,402 | Fair |
| SR 346-pa 346 over West Branch Tunungwant C | 1905 | 7,876 | Fair |
All bridges nearby: McKean County, PA bridge conditions · every bridge in McKean County · Pennsylvania bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.