US Bridges

Forest Blvd/Fau 91 over FAI 255/HARDING Dith

Good

St. Clair County, Illinois · 1.4MI N FAI 64 · Structure no. 082024400000000

Built
1985
40 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
556 ft
3 main spans
Daily traffic
550
2023 count
Owner
State
State Highway Agency

About this bridge

Forest Blvd/Fau 91 over FAI 255/HARDING Dith is a steel continuous stringer/multi-beam or girder carrying Forest Blvd/Fau 91 over FAI 255/HARDING Dith in St. Clair County, Illinois. It was built in 1985, so it is 40 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 550 vehicles a day, roughly 7% of them trucks, projected to reach 530 by 2046. The structure is 556 ft (169.5 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesForest Blvd/Fau 91
CrossesFAI 255/HARDING Dith
Location1.4MI N FAI 64
CountySt. Clair County
StateIllinois
Coordinates38.63694, -90.05716
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20 + Mod
Structure length556 ft (169.5 m)
Longest span197 ft (60 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic550 (2023)
Projected traffic530 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed6.2 mi (10 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 Forest Blvd/Fau 91 over FAI 255/HARDING Dith built?

It was built in 1985, making it 40 years old in 2025.

What condition is Forest Blvd/Fau 91 over FAI 255/HARDING Dith in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does Forest Blvd/Fau 91 over FAI 255/HARDING Dith carry?

About 550 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Forest Blvd/Fau 91 over FAI 255/HARDING Dith?

The structure is 556 ft (169.5 m) long with a longest span of 197 ft (60 m) and a deck 43 ft wide.

Who owns Forest Blvd/Fau 91 over FAI 255/HARDING Dith?

It is owned by the State Highway Agency.