US Bridges

81st ST/CH35 over FAI 64/CD 360-361

Fair

St. Clair County, Illinois · 1 MI West of Ill 157 · Structure no. 082026100000000

Built
1969
56 years old, rebuilt 2012
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
270 ft
2 main spans
Daily traffic
500
2023 count
Owner
State
State Highway Agency

About this bridge

81st ST/CH35 over FAI 64/CD 360-361 is a steel continuous stringer/multi-beam or girder carrying 81st ST/CH35 over FAI 64/CD 360-361 in St. Clair County, Illinois. It was built in 1969 and reconstructed in 2012, so it is 56 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 500 vehicles a day, roughly 26% of them trucks, projected to reach 202 by 2046. The structure is 270 ft (82.4 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries81st ST/CH35
CrossesFAI 64/CD 360-361
Location1 MI West of Ill 157
RouteCounty Highway 0
CountySt. Clair County
StateIllinois
Coordinates38.61909, -90.06029
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length270 ft (82.4 m)
Longest span142 ft (43.3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2023)
Projected traffic202 by 2046
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 81st ST/CH35 over FAI 64/CD 360-361 built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2012.

What condition is 81st ST/CH35 over FAI 64/CD 360-361 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 February 2023.

How much traffic does 81st ST/CH35 over FAI 64/CD 360-361 carry?

About 500 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is 81st ST/CH35 over FAI 64/CD 360-361?

The structure is 270 ft (82.4 m) long with a longest span of 142 ft (43.3 m) and a deck 43 ft wide.

Who owns 81st ST/CH35 over FAI 64/CD 360-361?

It is owned by the State Highway Agency.