US Bridges

SR-185 over Stillwater River

Good

Darke County, Ohio · 2.13MI.SE. of Jct. SR-121 · Structure no. 1902903

Built
1993
32 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete Continuous
Length
183 ft
4 main spans
Daily traffic
4,097
2015 count
Owner
State
State Highway Agency

About this bridge

SR-185 over Stillwater River is a concrete continuous slab carrying SR-185 over Stillwater River in Darke County, Ohio. It was built in 1993, so it is 32 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 4,097 vehicles a day, roughly 5% of them trucks, projected to reach 5,687 by 2035. The structure is 183 ft (55.8 m) long and 40 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesSR-185
CrossesStillwater River
Location2.13MI.SE. of Jct. SR-121
RouteState Highway 185
CountyDarke County
StateOhio
Coordinates40.18951, -84.47868
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length183 ft (55.8 m)
Longest span50 ft (15.2 m)
Deck width40 ft (12.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,097 (2015)
Projected traffic5,687 by 2035
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SR-185 over Stillwater River built?

It was built in 1993, making it 32 years old in 2025.

What condition is SR-185 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 July 2023.

How much traffic does SR-185 over Stillwater River carry?

About 4,097 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is SR-185 over Stillwater River?

The structure is 183 ft (55.8 m) long with a longest span of 50 ft (15.2 m) and a deck 40 ft wide.

Who owns SR-185 over Stillwater River?

It is owned by the State Highway Agency.