SR 18 over Noel Mercer Ditch
Seneca County, Ohio · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 18 over Noel Mercer Ditch in Seneca County, Ohio, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 1961, making it 64 years old at the 2025 inventory.
- It carries about 2,148 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 205 of the 278 inventoried bridges in Seneca County rated good (73.7%); 4 (1.4%) 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 April 2023, on a 24-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 → (41.19082, -82.95774)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 39 ft |
| Location | 100 Ft. N. of CR 46 |
| NBI structure number | 7400812 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 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 Ohio department of transportation.
Busiest bridges in Seneca County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Usr 224 over Sandusky River | 1956 | 10,539 | Good |
| SR 18 over Sandusky River | 1994 | 8,029 | Good |
| SR-53|JFK Memorial over CSX & Now RR | 1965 | 7,742 | Fair |
| SR 18D Perry St over Sandusky River | 1997 | 7,708 | Good |
| SR100 Washingtonst over Sandusky River | 1997 | 7,278 | Good |
| Hop CR 26 over Branch of Wolf Creek Ho | 1968 | 6,639 | Good |
All bridges nearby: Seneca County, OH bridge conditions · every bridge in Seneca County · Ohio bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.