US Bridges

Knox-School RD 403 over Mahoning River

Fair

Columbiana County, Ohio · 0.2 MI S T800 · Structure no. 1531239

Built
1977
48 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
107 ft
3 main spans
Daily traffic
1,891
2015 count
Owner
County
County Highway Agency

About this bridge

Knox-School RD 403 over Mahoning River is a concrete continuous slab carrying Knox-School RD 403 over Mahoning River in Columbiana 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 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 1,891 vehicles a day, roughly 8% of them trucks, projected to reach 2,625 by 2035. The structure is 107 ft (32.6 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesKnox-School RD 403
CrossesMahoning River
Location0.2 MI S T800
RouteCounty Highway C0403
CountyColumbiana County
StateOhio
Coordinates40.88374, -81.031
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating53.6 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length107 ft (32.6 m)
Longest span40 ft (12.2 m)
Deck width37 ft (11.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,891 (2015)
Projected traffic2,625 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 Knox-School RD 403 over Mahoning River built?

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

What condition is Knox-School RD 403 over Mahoning 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 June 2024.

How much traffic does Knox-School RD 403 over Mahoning River carry?

About 1,891 vehicles per day (2015 count), of which roughly 8% are trucks.

How long is Knox-School RD 403 over Mahoning River?

The structure is 107 ft (32.6 m) long with a longest span of 40 ft (12.2 m) and a deck 37 ft wide.

Who owns Knox-School RD 403 over Mahoning River?

It is owned by the County Highway Agency.