Irr N4520 over Creek
Ottawa County, Oklahoma · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr N4520 over Creek in Ottawa County, Oklahoma, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1935 and reconstructed in 2004, making it 90 years old at the 2025 inventory.
- It carries about 125 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 108 of the 271 inventoried bridges in Ottawa County rated fair (39.9%); 59 (21.8%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (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 → (36.67374, -94.94536)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Concrete slab |
| Length | about 21 ft |
| Location | 1.0 E. & 1.4 S. of Afton |
| NBI structure number | 042480000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | September 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oklahoma department of transportation.
Busiest bridges in Ottawa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Old S.H. 137 over Will Rogers Tp I-44 Und | 1956 | 21,000 | Fair |
| Will Rogers Tpi-44 over Creek | 1957 | 19,900 | Good |
| Will Rogers Tpi-44 over Horse Creek | 1957 | 19,900 | Good |
| Will Rogers Tpi-44 over BNSF R.R. Under | 1957 | 19,900 | Good |
| Will Rogers Tpi-44 over Creek | 1957 | 19,000 | Good |
| Will Rogers Tpi-44 over Creek | 1957 | 19,000 | Good |
All bridges nearby: Ottawa County, OK bridge conditions · every bridge in Ottawa County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.