US Bridges

SBI-4 over Cahokia Canal

Fair

St. Clair County, Illinois · E Ill 203 S Bend RD · Structure no. 082011300000000

Built
1923
102 years old, rebuilt 1997
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
135 ft
3 main spans
Daily traffic
900
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

SBI-4 over Cahokia Canal is a prestressed concrete box beam or girders - multiple carrying SBI-4 over Cahokia Canal in St. Clair County, Illinois. It was built in 1923 and reconstructed in 1997, so it is 102 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 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 900 vehicles a day, roughly 64% of them trucks, projected to reach 1,111 by 2046. The structure is 135 ft (41.3 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSBI-4
CrossesCahokia Canal
LocationE Ill 203 S Bend RD
RouteCity Street 0
CountySt. Clair County
StateIllinois
Coordinates38.65783, -90.1303
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
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 alignment6: Equal to present minimum criteria
Operating rating63.9 US tons
Inventory rating38.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length135 ft (41.3 m)
Longest span44 ft (13.3 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2023)
Projected traffic1,111 by 2046
Trucks64%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 SBI-4 over Cahokia Canal built?

It was built in 1923, making it 102 years old in 2025. It was reconstructed in 1997.

What condition is SBI-4 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 July 2023.

How much traffic does SBI-4 over Cahokia Canal carry?

About 900 vehicles per day (2023 count), of which roughly 64% are trucks.

How long is SBI-4 over Cahokia Canal?

The structure is 135 ft (41.3 m) long with a longest span of 44 ft (13.3 m) and a deck 35 ft wide.

Who owns SBI-4 over Cahokia Canal?

It is owned by the City or Municipal Highway Agency.