US Bridges

FAI 255NB over Cahokia Canal

Fair

Madison County, Illinois · .9MI So Ill 162 · Structure no. 060021800000000

Built
1985
40 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
404 ft
3 main spans
Daily traffic
20,150
2023 count
Owner
State
State Highway Agency

About this bridge

FAI 255NB over Cahokia Canal is a steel continuous stringer/multi-beam or girder carrying FAI 255NB over Cahokia Canal in Madison 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 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 20,150 vehicles a day, roughly 11% of them trucks, projected to reach 22,310 by 2046. The structure is 404 ft (123.2 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesFAI 255NB
CrossesCahokia Canal
Location.9MI So Ill 162
RouteInterstate 255
CountyMadison County
StateIllinois
Coordinates38.72293, -90.03033
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.8 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length404 ft (123.2 m)
Longest span153 ft (46.7 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,150 (2023)
Projected traffic22,310 by 2046
Trucks11%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 255NB over Cahokia Canal built?

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

What condition is FAI 255NB over Cahokia Canal 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 255NB over Cahokia Canal carry?

About 20,150 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is FAI 255NB over Cahokia Canal?

The structure is 404 ft (123.2 m) long with a longest span of 153 ft (46.7 m) and a deck 59 ft wide.

Who owns FAI 255NB over Cahokia Canal?

It is owned by the State Highway Agency.