I-35 over Bird Creek
Logan County, Oklahoma · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-35 over Bird Creek in Logan County, Oklahoma, 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 1959, making it 66 years old at the 2025 inventory.
- It carries about 25,900 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 169 of the 280 inventoried bridges in Logan County rated fair (60.4%); 55 (19.6%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated good in the 2024 inventory and is now fair (culvert 7 to 6).
- Its most recent inspection on record is dated September 2024, 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 → (35.87733, -97.39373)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 40 ft |
| Location | 300 Feet S. SH 33 |
| NBI structure number | 143240000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oklahoma department of transportation.
Busiest bridges in Logan County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-35 over Creek | 1959 | 33,500 | Fair |
| I-35 over Pin Creek | 1959 | 18,300 | Fair |
| I-35 NB over Creek | 1959 | 17,200 | Fair |
| I-35 S.B. over Creek | 1959 | 17,150 | Fair |
| SB I-35 over Triplett Rd. Under | 1998 | 16,900 | Fair |
| U.S. 77 over Creek | 1925 | 14,400 | Fair |
All bridges nearby: Logan County, OK bridge conditions · every bridge in Logan County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.