N3150 over Thompson Creek
Kay County, Oklahoma · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N3150 over Thompson Creek in Kay 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 1978, making it 47 years old at the 2025 inventory.
- It carries about 75 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 268 of the 419 inventoried bridges in Kay County rated fair (64.0%); 22 (5.3%) 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 January 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 → (36.81791, -97.39086)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 20 ft |
| Location | 2.5W .5N of I-35/SH11 |
| NBI structure number | 193650000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 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 Kay County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-35 over Salt Fk Ark Rvr Oflow | 1959 | 17,500 | Good |
| I-35 over Salt Fk Ark Rvr Oflow | 1962 | 17,500 | Fair |
| I-35 over Salt Fk Ark Rvr Oflow | 1962 | 17,500 | Fair |
| I-35 over Creek | 1959 | 15,700 | Fair |
| I-35 over Creek | 1960 | 15,500 | Fair |
| I-35 over Dry Creek | 1959 | 14,300 | Fair |
All bridges nearby: Kay County, OK bridge conditions · every bridge in Kay County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.