US Bridges

Gallman RD over ST Marys River

FairPosted for load

Mercer County, Ohio · 0.5 Mi. N. of Mercer Road · Structure no. 5457475

Built
2001
24 years old
Condition
Fair
inspected December 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
132 ft
1 main span
Daily traffic
213
2015 count
Owner
County
County Highway Agency

About this bridge

Gallman RD over ST Marys River is a prestressed concrete box beam or girders - multiple carrying Gallman RD over ST Marys River in Mercer County, Ohio. It was built in 2001, so it is 24 years old, younger 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. Its operating status is: posted for load restriction.

It carries about 213 vehicles a day, roughly 8% of them trucks, projected to reach 296 by 2035. The structure is 132 ft (40.2 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesGallman RD
CrossesST Marys River
Location0.5 Mi. N. of Mercer Road
RouteCounty Highway C175C
StateOhio
Coordinates40.66449, -84.46563
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length132 ft (40.2 m)
Longest span131 ft (39.9 m)
Deck width32 ft (9.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic213 (2015)
Projected traffic296 by 2035
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Gallman RD over ST Marys River built?

It was built in 2001, making it 24 years old in 2025.

What condition is Gallman RD 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 December 2024.

How much traffic does Gallman RD over ST Marys River carry?

About 213 vehicles per day (2015 count), of which roughly 8% are trucks.

How long is Gallman RD over ST Marys River?

The structure is 132 ft (40.2 m) long with a longest span of 131 ft (39.9 m) and a deck 32 ft wide.

Who owns Gallman RD over ST Marys River?

It is owned by the County Highway Agency.