US Bridges

N Siu Ent RD SB over Cahokia Creek

Fair

Madison County, Illinois · 0.6 MI S Ill 143 · Structure no. 060014100000000

Built
1967
58 years old, rebuilt 2016
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
279 ft
4 main spans
Daily traffic
2,775
2021 count
Owner
State
State Highway Agency

About this bridge

N Siu Ent RD SB over Cahokia Creek is a steel continuous stringer/multi-beam or girder carrying N Siu Ent RD SB over Cahokia Creek in Madison County, Illinois. It was built in 1967 and reconstructed in 2016, so it is 58 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 2,775 vehicles a day, roughly 6% of them trucks, projected to reach 2,969 by 2046. The structure is 279 ft (85 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesN Siu Ent RD SB
CrossesCahokia Creek
Location0.6 MI S Ill 143
CountyMadison County
StateIllinois
Coordinates38.82497, -89.99411
Functional classUrban Minor Arterial

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.1 US tons
Inventory rating54.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length279 ft (85 m)
Longest span77 ft (23.6 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,775 (2021)
Projected traffic2,969 by 2046
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 N Siu Ent RD SB over Cahokia Creek built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2016.

What condition is N Siu Ent RD SB over Cahokia Creek 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 May 2024.

How much traffic does N Siu Ent RD SB over Cahokia Creek carry?

About 2,775 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is N Siu Ent RD SB over Cahokia Creek?

The structure is 279 ft (85 m) long with a longest span of 77 ft (23.6 m) and a deck 36 ft wide.

Who owns N Siu Ent RD SB over Cahokia Creek?

It is owned by the State Highway Agency.