US Bridges

SR 81 over Shallow Run

Fair

Hardin County, Ohio · 0.63 MI East of Usr 68 · Structure no. 3301079

Built
1977
48 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
55 ft
3 main spans
Daily traffic
695
2015 count
Owner
State
State Highway Agency

About this bridge

SR 81 over Shallow Run is a concrete continuous slab carrying SR 81 over Shallow Run in Hardin County, Ohio. It was built in 1977, so it is 48 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 5 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 695 vehicles a day, roughly 5% of them trucks, projected to reach 965 by 2035. The structure is 55 ft (16.8 m) long and 45 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSR 81
CrossesShallow Run
Location0.63 MI East of Usr 68
RouteState Highway 81
CountyHardin County
StateOhio
Coordinates40.7827, -83.62994
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length55 ft (16.8 m)
Longest span20 ft (6.1 m)
Deck width45 ft (13.8 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic695 (2015)
Projected traffic965 by 2035
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 81 over Shallow Run built?

It was built in 1977, making it 48 years old in 2025.

What condition is SR 81 over Shallow Run 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 June 2024.

How much traffic does SR 81 over Shallow Run carry?

About 695 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is SR 81 over Shallow Run?

The structure is 55 ft (16.8 m) long with a longest span of 20 ft (6.1 m) and a deck 45 ft wide.

Who owns SR 81 over Shallow Run?

It is owned by the State Highway Agency.