N3170 over Grassy Creek
Noble County, Oklahoma · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N3170 over Grassy Creek in Noble County, Oklahoma, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 2021, making it 4 years old at the 2025 inventory.
- It carries about 24 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 117 of the 342 inventoried bridges in Noble County rated good (34.2%); 12 (3.5%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (36.52972, -97.35444)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 80 ft |
| Location | 5E .5S of Billings |
| NBI structure number | 329840000000000 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oklahoma department of transportation.
Busiest bridges in Noble County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-35 over Creek | 1960 | 17,600 | Fair |
| I-35 over Hackberry Creek | 1960 | 17,600 | Fair |
| I-35 over Creek | 1960 | 17,100 | Good |
| I-35 over Creek | 1960 | 17,100 | Fair |
| I-35 over Red Rock CR Oflow & Rd | 1960 | 17,100 | Fair |
| I-35 over Doe Creek | 1960 | 17,100 | Fair |
All bridges nearby: Noble County, OK bridge conditions · every bridge in Noble County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.