US Bridges

SR-118 over St. Marys River

Fair

Mercer County, Ohio · .04MI N of JCT USR-33 · Structure no. 5401801

Built
1938
87 years old, rebuilt 1985
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
256 ft
4 main spans
Daily traffic
2,581
2015 count
Owner
State
State Highway Agency

About this bridge

SR-118 over St. Marys River is a steel continuous stringer/multi-beam or girder carrying SR-118 over St. Marys River in Mercer County, Ohio. It was built in 1938 and reconstructed in 1985, so it is 87 years old, older than the Ohio average of 47.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,581 vehicles a day, roughly 13% of them trucks, projected to reach 3,582 by 2035. The structure is 256 ft (78 m) long and 30 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesSR-118
CrossesSt. Marys River
Location.04MI N of JCT USR-33
RouteState Highway 118
CountyMercer County
StateOhio
Coordinates40.69448, -84.64648
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating37.1 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length256 ft (78 m)
Longest span70 ft (21.3 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,581 (2015)
Projected traffic3,582 by 2035
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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-118 over St. Marys River built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1985.

What condition is SR-118 over St. Marys River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does SR-118 over St. Marys River carry?

About 2,581 vehicles per day (2015 count), of which roughly 13% are trucks.

How long is SR-118 over St. Marys River?

The structure is 256 ft (78 m) long with a longest span of 70 ft (21.3 m) and a deck 30 ft wide.

Who owns SR-118 over St. Marys River?

It is owned by the State Highway Agency.