Darke-Mercer over Niswonger Dt
GoodDarke County, Ohio · .5 MI E Coates RD · Structure no. 1954873
- Built
- 2006
- 19 years old
- Condition
- Good
- inspected September 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 42 ft
- 1 main span
- Daily traffic
- 1,220
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Darke-Mercer over Niswonger Dt is a prestressed concrete box beam or girders - multiple carrying Darke-Mercer over Niswonger Dt in Darke County, Ohio. It was built in 2006, so it is 19 years old, younger than the Ohio average of 47.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 1,220 vehicles a day, roughly 8% of them trucks, projected to reach 1,693 by 2035. The structure is 42 ft (12.8 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Darke-Mercer over Niswonger Dt built?
It was built in 2006, making it 19 years old in 2025.
What condition is Darke-Mercer over Niswonger Dt in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.
How much traffic does Darke-Mercer over Niswonger Dt carry?
About 1,220 vehicles per day (2015 count), of which roughly 8% are trucks.
How long is Darke-Mercer over Niswonger Dt?
The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 28 ft wide.
Who owns Darke-Mercer over Niswonger Dt?
It is owned by the County Highway Agency.