Knowlton Road over Chester Creek / 3696-c10
Delaware County, Pennsylvania · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Knowlton Road over Chester Creek / 3696-c10 in Delaware County, Pennsylvania, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1850 and reconstructed in 2014, making it 175 years old at the 2025 inventory.
- It carries about 5,295 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 249 of the 389 inventoried bridges in Delaware County rated fair (64.0%); 43 (11.1%) are rated poor.
- 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 → (39.87717, -75.41919)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Masonry deck arch |
| Length | about 82 ft |
| Location | Aston Industr.pk. 33h13 |
| NBI structure number | 000000000015325 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Pennsylvania department of transportation.
Busiest bridges in Delaware County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Interstate 95 over Ridley Creek & Sun Drive | 1965 | 218,717 | Fair |
| Interstate 95 over Bullens Lane (turnback) | 1975 | 218,717 | Fair |
| Interstate 95 over Darby Creek | 1975 | 161,622 | Fair |
| Interstate 95 over Ramp E &ramp F to Barry | 1977 | 135,104 | Fair |
| Interstate 95 over Septa (not Active) | 1964 | 135,104 | Fair |
| Interstate 95 over Kerlin Street | 1964 | 135,104 | Fair |
All bridges nearby: Delaware County, PA bridge conditions · every bridge in Delaware County · Pennsylvania bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.