US Bridges

FAU 7421 over FAP 322A(US 51)

Fair

Macon County, Illinois · 1 MI SW of Decatur · Structure no. 058010300000000

Built
1976
49 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
456 ft
4 main spans
Daily traffic
1,300
2020 count
Owner
State
State Highway Agency

About this bridge

FAU 7421 over FAP 322A(US 51) is a steel continuous stringer/multi-beam or girder carrying FAU 7421 over FAP 322A(US 51) in Macon County, Illinois. It was built in 1976, so it is 49 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 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 1,300 vehicles a day, roughly 13% of them trucks, projected to reach 1,313 by 2046. The structure is 456 ft (139 m) long and 42 ft wide.

CarriesFAU 7421
CrossesFAP 322A(US 51)
Location1 MI SW of Decatur
Coordinates39.81473, -89.0288
Functional classUrban Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.3 US tons
Inventory rating26.5 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length456 ft (139 m)
Longest span162 ft (49.4 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2020)
Projected traffic1,313 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was FAU 7421 over FAP 322A(US 51) built?

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

What condition is FAU 7421 over FAP 322A(US 51) 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 August 2024.

How much traffic does FAU 7421 over FAP 322A(US 51) carry?

About 1,300 vehicles per day (2020 count), of which roughly 13% are trucks.

How long is FAU 7421 over FAP 322A(US 51)?

The structure is 456 ft (139 m) long with a longest span of 162 ft (49.4 m) and a deck 42 ft wide.

Who owns FAU 7421 over FAP 322A(US 51)?

It is owned by the State Highway Agency.