US Bridges

Irwin-Simpson Road over Simpson Creek

FairPosted for load

Warren County, Ohio · 0.24 MI W of CR 15 · Structure no. 8332266

Built
1976
49 years old
Condition
Fair
inspected December 2024
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
7,264
2015 count
Owner
County
County Highway Agency

About this bridge

Irwin-Simpson Road over Simpson Creek is a concrete slab carrying Irwin-Simpson Road over Simpson Creek in Warren County, Ohio. It was built in 1976, so it is 49 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. Its operating status is: posted for load restriction.

It carries about 7,264 vehicles a day, roughly 5% of them trucks, projected to reach 10,082 by 2035. The structure is 23 ft (7 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesIrwin-Simpson Road
CrossesSimpson Creek
Location0.24 MI W of CR 15
RouteCounty Highway T0055
StateOhio
Coordinates39.31325, -84.28821
Functional classUrban 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 stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.2 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span21 ft (6.4 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,264 (2015)
Projected traffic10,082 by 2035
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Irwin-Simpson Road over Simpson Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is Irwin-Simpson Road over Simpson Creek 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 Irwin-Simpson Road over Simpson Creek carry?

About 7,264 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Irwin-Simpson Road over Simpson Creek?

The structure is 23 ft (7 m) long with a longest span of 21 ft (6.4 m) and a deck 28 ft wide.

Who owns Irwin-Simpson Road over Simpson Creek?

It is owned by the County Highway Agency.