US Bridges

SR-707 over St. Marys River

Good

Mercer County, Ohio · 2.78MI.S.OF Jct. SR-117 · Structure no. 5404142

Built
1953
72 years old, rebuilt 1994
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
224 ft
3 main spans
Daily traffic
566
2015 count
Owner
State
State Highway Agency

About this bridge

SR-707 over St. Marys River is a steel continuous stringer/multi-beam or girder carrying SR-707 over St. Marys River in Mercer County, Ohio. It was built in 1953 and reconstructed in 1994, so it is 72 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 566 vehicles a day, roughly 4% of them trucks, projected to reach 786 by 2035. The structure is 224 ft (68.3 m) long and 36 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesSR-707
CrossesSt. Marys River
Location2.78MI.S.OF Jct. SR-117
RouteState Highway 707
StateOhio
Coordinates40.67671, -84.5187
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 protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.3 US tons
Inventory rating26.5 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length224 ft (68.3 m)
Longest span85 ft (25.9 m)
Deck width36 ft (11 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic566 (2015)
Projected traffic786 by 2035
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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-707 over St. Marys River built?

It was built in 1953, making it 72 years old in 2025. It was reconstructed in 1994.

What condition is SR-707 over St. Marys 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 August 2024.

How much traffic does SR-707 over St. Marys River carry?

About 566 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is SR-707 over St. Marys River?

The structure is 224 ft (68.3 m) long with a longest span of 85 ft (25.9 m) and a deck 36 ft wide.

Who owns SR-707 over St. Marys River?

It is owned by the State Highway Agency.