US Bridges

FAI 255 over Ill 157

Fair

St. Clair County, Illinois · 0.50 So of Doris Ave · Structure no. 082022200000000

Built
1979
46 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
156 ft
2 main spans
Daily traffic
36,700
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 255 over Ill 157 is a steel continuous stringer/multi-beam or girder carrying FAI 255 over Ill 157 in St. Clair County, Illinois. It was built in 1979, so it is 46 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 36,700 vehicles a day, roughly 17% of them trucks, projected to reach 39,794 by 2046. The structure is 156 ft (47.5 m) long and 147 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesFAI 255
CrossesIll 157
Location0.50 So of Doris Ave
RouteInterstate 255
CountySt. Clair County
StateIllinois
Coordinates38.55043, -90.16225
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.
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 inspectionJanuary 2023
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.5 US tons
Inventory rating49.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length156 ft (47.5 m)
Longest span85 ft (25.9 m)
Deck width147 ft (44.9 m)
Roadway width144 ft (44 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,700 (2023)
Projected traffic39,794 by 2046
Trucks17%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed9.9 mi (16 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 Ill 157 built?

It was built in 1979, making it 46 years old in 2025.

What condition is FAI 255 over Ill 157 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 2023.

How much traffic does FAI 255 over Ill 157 carry?

About 36,700 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is FAI 255 over Ill 157?

The structure is 156 ft (47.5 m) long with a longest span of 85 ft (25.9 m) and a deck 147 ft wide.

Who owns FAI 255 over Ill 157?

It is owned by the State Highway Agency.