N3510 over Arkansas River Trib.
Pawnee County, Oklahoma · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N3510 over Arkansas River Trib. in Pawnee County, Oklahoma, 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 2010, making it 15 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 60 of the 174 inventoried bridges in Pawnee County rated fair (34.5%); 32 (18.4%) 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 August 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 → (36.50917, -96.74611)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 49 ft |
| Location | .9W .2N of Ralston |
| NBI structure number | 302740000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oklahoma department of transportation.
Busiest bridges in Pawnee County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| U.S. 64 over Arkansas River | 1963 | 16,000 | Fair |
| U.S. 64 over Cedar Creek | 2021 | 8,734 | Good |
| Cimarron Tp over Creek | 1973 | 8,600 | Good |
| Cimarron Tp over No Name Creek | 1973 | 8,600 | Fair |
| Cimarron Tp over BNSF R.R. | 1973 | 8,600 | Fair |
| Cimarron Tp over Cowskin Creek | 1973 | 8,600 | Good |
All bridges nearby: Pawnee County, OK bridge conditions · every bridge in Pawnee County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.