US Bridges

Siler Road over Twelve Mile Creek

Good

Mercer County, Ohio · .6 MI S. Mercer Road · Structure no. 5454840

Built
1997
28 years old
Condition
Good
inspected December 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
81 ft
1 main span
Daily traffic
324
2015 count
Owner
County
County Highway Agency

About this bridge

Siler Road over Twelve Mile Creek is a prestressed concrete box beam or girders - multiple carrying Siler Road over Twelve Mile Creek in Mercer County, Ohio. It was built in 1997, so it is 28 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 324 vehicles a day, roughly 7% of them trucks, projected to reach 450 by 2035. The structure is 81 ft (24.7 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSiler Road
CrossesTwelve Mile Creek
Location.6 MI S. Mercer Road
RouteCounty Highway T135E
StateOhio
Coordinates40.64638, -84.54216
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 length81 ft (24.7 m)
Longest span80 ft (24.4 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic324 (2015)
Projected traffic450 by 2035
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Siler Road over Twelve Mile Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is Siler Road over Twelve Mile Creek 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 December 2024.

How much traffic does Siler Road over Twelve Mile Creek carry?

About 324 vehicles per day (2015 count), of which roughly 7% are trucks.

How long is Siler Road over Twelve Mile Creek?

The structure is 81 ft (24.7 m) long with a longest span of 80 ft (24.4 m) and a deck 28 ft wide.

Who owns Siler Road over Twelve Mile Creek?

It is owned by the County Highway Agency.