Duncanson RD #139 over Flat Run
Highland County, Ohio · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Duncanson RD #139 over Flat Run in Highland County, Ohio, 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 1984 and reconstructed in 2002, making it 41 years old at the 2025 inventory.
- It carries about 324 vehicles a day (traffic count year 2015).
- Its listed owner is the county highway agency.
- It is one of 175 of the 245 inventoried bridges in Highland County rated good (71.4%); 5 (2.0%) 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 March 2024, on a 12-month routine inspection cycle.
- 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 → (39.04132, -83.81578)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 33 ft |
| Location | South of CR.#2 |
| NBI structure number | 3633756 |
| Condition class | Good |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | March 2024 |
| Inspection interval (item 91) | 12 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 Ohio department of transportation.
Busiest bridges in Highland County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 62 over Moberly Branch | 1993 | 9,359 | Good |
| SR 73 over Moberly Branch | 1984 | 8,583 | Good |
| SR 32 over N.fork of White Oak Cree | 1980 | 7,173 | Good |
| SR 32 over N Fork of White Oak Cree | 1980 | 7,173 | Fair |
| US 62 over Clear Creek | 1934 | 7,161 | Poor |
| SR 28 over Paint Creek & R.R. | 1963 | 6,362 | Good |
All bridges nearby: Highland County, OH bridge conditions · every bridge in Highland County · Ohio bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.