US Bridges

Conover over Stillwater River

Good

Darke County, Ohio · .31 MI S Martz · Structure no. 1959298

Built
1982
43 years old
Condition
Good
inspected October 2024
Type
Truss - Thru
Steel
Length
141 ft
1 main span
Daily traffic
607
2015 count
Owner
County
County Highway Agency

About this bridge

Conover over Stillwater River is a steel truss - thru carrying Conover over Stillwater River in Darke County, Ohio. It was built in 1982, so it is 43 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 607 vehicles a day, roughly 8% of them trucks, projected to reach 843 by 2035. The structure is 141 ft (43 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesConover
CrossesStillwater River
Location.31 MI S Martz
RouteCounty Highway T0041
StateOhio
Coordinates40.19086, -84.51241
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.9 US tons
Inventory rating25 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20
Structure length141 ft (43 m)
Longest span135 ft (41.1 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic607 (2015)
Projected traffic843 by 2035
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Conover over Stillwater River built?

It was built in 1982, making it 43 years old in 2025.

What condition is Conover over Stillwater River 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 October 2024.

How much traffic does Conover over Stillwater River carry?

About 607 vehicles per day (2015 count), of which roughly 8% are trucks.

How long is Conover over Stillwater River?

The structure is 141 ft (43 m) long with a longest span of 135 ft (41.1 m) and a deck 24 ft wide.

Who owns Conover over Stillwater River?

It is owned by the County Highway Agency.