US Bridges

FAU 9212 over Upper Cahokia Rd.

Fair

St. Clair County, Illinois · Cahokia at Parks Air · Structure no. 082308100000000

Built
1980
45 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
140 ft
3 main spans
Daily traffic
6,450
2023 count
Owner
County
County Highway Agency

About this bridge

FAU 9212 over Upper Cahokia Rd. is a steel continuous stringer/multi-beam or girder carrying FAU 9212 over Upper Cahokia Rd. in St. Clair County, Illinois. It was built in 1980, so it is 45 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 6,450 vehicles a day, roughly 11% of them trucks, projected to reach 4,495 by 2046. The structure is 140 ft (42.8 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFAU 9212
CrossesUpper Cahokia Rd.
LocationCahokia at Parks Air
CountySt. Clair County
StateIllinois
Coordinates38.58407, -90.16502
Functional classUrban Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length140 ft (42.8 m)
Longest span54 ft (16.5 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,450 (2023)
Projected traffic4,495 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$666,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was FAU 9212 over Upper Cahokia Rd. built?

It was built in 1980, making it 45 years old in 2025.

What condition is FAU 9212 over Upper Cahokia Rd. 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 March 2023.

How much traffic does FAU 9212 over Upper Cahokia Rd. carry?

About 6,450 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is FAU 9212 over Upper Cahokia Rd.?

The structure is 140 ft (42.8 m) long with a longest span of 54 ft (16.5 m) and a deck 30 ft wide.

Who owns FAU 9212 over Upper Cahokia Rd.?

It is owned by the County Highway Agency.