SR 646 over Conotton CR
Harrison County, Ohio · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 646 over Conotton CR in Harrison County, Ohio, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 1955 and reconstructed in 1998, making it 70 years old at the 2025 inventory.
- It carries about 1,668 vehicles a day (traffic count year 2015).
- Its listed owner is the state highway agency.
- It is one of 54 of the 138 inventoried bridges in Harrison County rated good (39.1%); 20 (14.5%) 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 → (40.39396, -81.08438)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 133 ft |
| Location | 6.59 Mi E of US 22 |
| NBI structure number | 3402975 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Ohio department of transportation.
Busiest bridges in Harrison County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 250 over Col.& Ohio R.rr Spur | 1950 | 6,972 | Good |
| 00250 over Tappan Lake (willis Run) | 2024 | 6,500 | Good |
| SR 22 over W & Le RR. | 1962 | 6,200 | Good |
| US 250 over Plum Run | 1951 | 5,496 | Fair |
| US 250 over Beaver Dam Run Tappan Lk | 1946 | 4,914 | Good |
| US 250 over Clear Fork CR Tappan Lak | 1946 | 4,914 | Fair |
All bridges nearby: Harrison County, OH bridge conditions · every bridge in Harrison County · Ohio bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.