US Bridges

Darke-Mercer over Wabash River

Fair

Darke County, Ohio · .16 MI W Light-Northern · Structure no. 1951939

Built
1925
100 years old
Condition
Fair
inspected July 2024
Type
Truss - Thru
Concrete
Length
35 ft
1 main span
Daily traffic
674
2015 count
Owner
County
County Highway Agency

About this bridge

Darke-Mercer over Wabash River is a concrete truss - thru carrying Darke-Mercer over Wabash River in Darke County, Ohio. It was built in 1925, so it is 100 years old, older than the Ohio average of 47.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 674 vehicles a day, roughly 8% of them trucks, projected to reach 936 by 2035. The structure is 35 ft (10.7 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesDarke-Mercer
CrossesWabash River
Location.16 MI W Light-Northern
RouteCounty Highway C0007
CountyDarke County
StateOhio
Coordinates40.3521, -84.71283
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.9 US tons
Inventory rating25 US tons

Structure

Structure typeTruss - Thru
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span30 ft (9.1 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic674 (2015)
Projected traffic936 by 2035
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Darke-Mercer over Wabash River built?

It was built in 1925, making it 100 years old in 2025.

What condition is Darke-Mercer over Wabash River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

How much traffic does Darke-Mercer over Wabash River carry?

About 674 vehicles per day (2015 count), of which roughly 8% are trucks.

How long is Darke-Mercer over Wabash River?

The structure is 35 ft (10.7 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.

Who owns Darke-Mercer over Wabash River?

It is owned by the County Highway Agency.