US Bridges

CR 91 over Flat Branch

Fair

Logan County, Ohio · 1.21 M E of TR 46 · Structure no. 4638484

Built
1908
117 years old, rebuilt 1985
Condition
Fair
inspected December 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
567
2015 count
Owner
County
County Highway Agency

About this bridge

CR 91 over Flat Branch is a prestressed concrete box beam or girders - multiple carrying CR 91 over Flat Branch in Logan County, Ohio. It was built in 1908 and reconstructed in 1985, so it is 117 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 567 vehicles a day, roughly 8% of them trucks, projected to reach 787 by 2035. The structure is 24 ft (7.3 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCR 91
CrossesFlat Branch
Location1.21 M E of TR 46
RouteCounty Highway C0091
CountyLogan County
StateOhio
Coordinates40.40007, -83.80514
Functional classRural Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width27 ft (8.2 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic567 (2015)
Projected traffic787 by 2035
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 CR 91 over Flat Branch built?

It was built in 1908, making it 117 years old in 2025. It was reconstructed in 1985.

What condition is CR 91 over Flat Branch 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 CR 91 over Flat Branch carry?

About 567 vehicles per day (2015 count), of which roughly 8% are trucks.

How long is CR 91 over Flat Branch?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 27 ft wide.

Who owns CR 91 over Flat Branch?

It is owned by the County Highway Agency.