N3448 over Mill Creek
Johnston County, Oklahoma · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N3448 over Mill Creek in Johnston 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 1938 and reconstructed in 1986, making it 87 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 94 of the 154 inventoried bridges in Johnston County rated fair (61.0%); 6 (3.9%) 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 May 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 → (34.4245, -96.86618)
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 | Steel stringer or multi-beam girder |
| Length | about 22 ft |
| Location | 1.4N & 2.2W of Mill Creek |
| NBI structure number | 057160000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | May 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 7: scour countermeasures installed |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Oklahoma department of transportation.
Busiest bridges in Johnston County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| S.H. 22 over Pennington Creek | 1954 | 7,000 | Fair |
| S.H. 22 over Sand Creek | 1964 | 4,100 | Good |
| S.H. 22 over Rock Creek | 1964 | 3,700 | Fair |
| S.H. 22 over Little Sandy Creek | 1975 | 3,700 | Fair |
| S.H. 22 over Big Sandy Creek | 1975 | 3,700 | Fair |
| S.H. 199 over Camp Creek | 1959 | 3,500 | Fair |
All bridges nearby: Johnston County, OK bridge conditions · every bridge in Johnston County · Oklahoma bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.