US Bridges

FAI 255 NB over FAI 64

Fair

St. Clair County, Illinois · .75 MI So Bunkum RD · Structure no. 082024100000000

Built
1981
44 years old, rebuilt 2013
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
362 ft
3 main spans
Daily traffic
23,850
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 255 NB over FAI 64 is a steel continuous stringer/multi-beam or girder carrying FAI 255 NB over FAI 64 in St. Clair County, Illinois. It was built in 1981 and reconstructed in 2013, so it is 44 years old, younger 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 23,850 vehicles a day, roughly 15% of them trucks, projected to reach 24,200 by 2046. The structure is 362 ft (110.3 m) long and 111 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesFAI 255 NB
CrossesFAI 64
Location.75 MI So Bunkum RD
RouteInterstate 255
CountySt. Clair County
StateIllinois
Coordinates38.61848, -90.0685
Functional classUrban Principal Arterial - Interstate

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.9 US tons
Inventory rating50.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length362 ft (110.3 m)
Longest span156 ft (47.5 m)
Deck width111 ft (33.9 m)
Roadway width108 ft (32.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,850 (2023)
Projected traffic24,200 by 2046
Trucks15%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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 FAI 255 NB over FAI 64 built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2013.

What condition is FAI 255 NB over FAI 64 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 January 2025.

How much traffic does FAI 255 NB over FAI 64 carry?

About 23,850 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is FAI 255 NB over FAI 64?

The structure is 362 ft (110.3 m) long with a longest span of 156 ft (47.5 m) and a deck 111 ft wide.

Who owns FAI 255 NB over FAI 64?

It is owned by the State Highway Agency.