US Bridges

SR-55 over Stillwater River

Good

Miami County, Ohio · 1.06MI.E. of Jct. SR-48 · Structure no. 5501245

Built
1984
41 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
377 ft
4 main spans
Daily traffic
6,881
2015 count
Owner
State
State Highway Agency

About this bridge

SR-55 over Stillwater River is a steel continuous stringer/multi-beam or girder carrying SR-55 over Stillwater River in Miami County, Ohio. It was built in 1984, so it is 41 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 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 6,881 vehicles a day, roughly 3% of them trucks, projected to reach 9,551 by 2035. The structure is 377 ft (114.9 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSR-55
CrossesStillwater River
Location1.06MI.E. of Jct. SR-48
RouteState Highway 55
CountyMiami County
StateOhio
Coordinates39.99457, -84.3151
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating50.4 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length377 ft (114.9 m)
Longest span110 ft (33.5 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,881 (2015)
Projected traffic9,551 by 2035
Trucks3%
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

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-55 over Stillwater River built?

It was built in 1984, making it 41 years old in 2025.

What condition is SR-55 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 May 2024.

How much traffic does SR-55 over Stillwater River carry?

About 6,881 vehicles per day (2015 count), of which roughly 3% are trucks.

How long is SR-55 over Stillwater River?

The structure is 377 ft (114.9 m) long with a longest span of 110 ft (33.5 m) and a deck 30 ft wide.

Who owns SR-55 over Stillwater River?

It is owned by the State Highway Agency.