US Bridges

FAP-322 (US-51) over FAI-70

Fair

Fayette County, Illinois · US-51 Vandalia Int · Structure no. 026003200000000

Built
1964
61 years old, rebuilt 2024
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
285 ft
4 main spans
Daily traffic
6,450
2023 count
Owner
State
State Highway Agency

About this bridge

FAP-322 (US-51) over FAI-70 is a steel continuous stringer/multi-beam or girder carrying FAP-322 (US-51) over FAI-70 in Fayette County, Illinois. It was built in 1964 and reconstructed in 2024, so it is 61 years old, older than the Illinois average of 45.3 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 6,450 vehicles a day, roughly 12% of them trucks, projected to reach 7,803 by 2046. The structure is 285 ft (87 m) long and 80 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFAP-322 (US-51)
CrossesFAI-70
LocationUS-51 Vandalia Int
RouteU.S. Route 51
CountyFayette County
StateIllinois
Coordinates38.97854, -89.09642
Functional classUrban Other Principal Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length285 ft (87 m)
Longest span84 ft (25.6 m)
Deck width80 ft (24.3 m)
Roadway width61 ft (18.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,450 (2023)
Projected traffic7,803 by 2046
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$2.7 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was FAP-322 (US-51) over FAI-70 built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2024.

What condition is FAP-322 (US-51) over FAI-70 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 April 2024.

How much traffic does FAP-322 (US-51) over FAI-70 carry?

About 6,450 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is FAP-322 (US-51) over FAI-70?

The structure is 285 ft (87 m) long with a longest span of 84 ft (25.6 m) and a deck 80 ft wide.

Who owns FAP-322 (US-51) over FAI-70?

It is owned by the State Highway Agency.