US Bridges

Il 255 SB over Cahokia Diversion

Fair

Madison County, Illinois · S. Corp Lmts Roxanna · Structure no. 060027900000000

Built
1995
30 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
445 ft
4 main spans
Daily traffic
28,300
2023 count
Owner
State
State Highway Agency

About this bridge

Il 255 SB over Cahokia Diversion is a steel continuous stringer/multi-beam or girder carrying Il 255 SB over Cahokia Diversion in Madison County, Illinois. It was built in 1995, so it is 30 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 28,300 vehicles a day, roughly 12% of them trucks, projected to reach 14,927 by 2046. The structure is 445 ft (135.6 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIl 255 SB
CrossesCahokia Diversion
LocationS. Corp Lmts Roxanna
RouteState Highway 255
CountyMadison County
StateIllinois
Coordinates38.80322, -90.04369
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating34.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length445 ft (135.6 m)
Longest span118 ft (36.1 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,300 (2023)
Projected traffic14,927 by 2046
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Il 255 SB over Cahokia Diversion built?

It was built in 1995, making it 30 years old in 2025.

What condition is Il 255 SB over Cahokia Diversion 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 November 2024.

How much traffic does Il 255 SB over Cahokia Diversion carry?

About 28,300 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Il 255 SB over Cahokia Diversion?

The structure is 445 ft (135.6 m) long with a longest span of 118 ft (36.1 m) and a deck 43 ft wide.

Who owns Il 255 SB over Cahokia Diversion?

It is owned by the State Highway Agency.