US Bridges

Boyer Road over Stillwater River

Good

Darke County, Ohio · .2 Mi.S. Martz Rd. · Structure no. 1959271

Built
1991
34 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
151 ft
3 main spans
Daily traffic
477
2015 count
Owner
County
County Highway Agency

About this bridge

Boyer Road over Stillwater River is a prestressed concrete box beam or girders - multiple carrying Boyer Road over Stillwater River in Darke County, Ohio. It was built in 1991, so it is 34 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 477 vehicles a day, roughly 8% of them trucks, projected to reach 662 by 2035. The structure is 151 ft (46 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesBoyer Road
CrossesStillwater River
Location.2 Mi.S. Martz Rd.
RouteCounty Highway C0100
CountyDarke County
StateOhio
Coordinates40.19087, -84.50175
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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.9 US tons
Inventory rating39.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20 + Mod
Structure length151 ft (46 m)
Longest span80 ft (24.4 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic477 (2015)
Projected traffic662 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 Boyer Road over Stillwater River built?

It was built in 1991, making it 34 years old in 2025.

What condition is Boyer Road 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 2023.

How much traffic does Boyer Road over Stillwater River carry?

About 477 vehicles per day (2015 count), of which roughly 8% are trucks.

How long is Boyer Road over Stillwater River?

The structure is 151 ft (46 m) long with a longest span of 80 ft (24.4 m) and a deck 28 ft wide.

Who owns Boyer Road over Stillwater River?

It is owned by the County Highway Agency.