US Bridges

SR-185 over Stillwater River

Good

Miami County, Ohio · 1.6MI.E. of Darke County · Structure no. 5503485

Built
1963
62 years old, rebuilt 2008
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
239 ft
3 main spans
Daily traffic
2,844
2015 count
Owner
State
State Highway Agency

About this bridge

SR-185 over Stillwater River is a steel continuous stringer/multi-beam or girder carrying SR-185 over Stillwater River in Miami County, Ohio. It was built in 1963 and reconstructed in 2008, so it is 62 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,844 vehicles a day, roughly 7% of them trucks, projected to reach 3,947 by 2035. The structure is 239 ft (72.8 m) long and 31 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesSR-185
CrossesStillwater River
Location1.6MI.E. of Darke County
RouteState Highway 185
StateOhio
Coordinates40.16023, -84.40135
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length239 ft (72.8 m)
Longest span91 ft (27.6 m)
Deck width31 ft (9.6 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,844 (2015)
Projected traffic3,947 by 2035
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 1963, making it 62 years old in 2025. It was reconstructed in 2008.

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 June 2024.

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

About 2,844 vehicles per day (2015 count), of which roughly 7% are trucks.

How long is SR-185 over Stillwater River?

The structure is 239 ft (72.8 m) long with a longest span of 91 ft (27.6 m) and a deck 31 ft wide.

Who owns SR-185 over Stillwater River?

It is owned by the State Highway Agency.