US Bridges

FAI 255 over Summit Ave

Fair

St. Clair County, Illinois · 0.3 MI N of State ST · Structure no. 082023600000000

Built
1982
43 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
173 ft
3 main spans
Daily traffic
44,600
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 255 over Summit Ave is a prestressed concrete stringer/multi-beam or girder carrying FAI 255 over Summit Ave in St. Clair County, Illinois. It was built in 1982, so it is 43 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 44,600 vehicles a day, roughly 16% of them trucks, projected to reach 48,278 by 2046. The structure is 173 ft (52.7 m) long and 149 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFAI 255
CrossesSummit Ave
Location0.3 MI N of State ST
RouteInterstate 255
CountySt. Clair County
StateIllinois
Coordinates38.60635, -90.08338
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 rating75.7 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length173 ft (52.7 m)
Longest span79 ft (24.1 m)
Deck width149 ft (45.5 m)
Roadway width146 ft (44.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,600 (2023)
Projected traffic48,278 by 2046
Trucks16%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was FAI 255 over Summit Ave built?

It was built in 1982, making it 43 years old in 2025.

What condition is FAI 255 over Summit Ave 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 over Summit Ave carry?

About 44,600 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is FAI 255 over Summit Ave?

The structure is 173 ft (52.7 m) long with a longest span of 79 ft (24.1 m) and a deck 149 ft wide.

Who owns FAI 255 over Summit Ave?

It is owned by the State Highway Agency.