US Bridges

FAU6121 & I-39 SB over Conveyor Belt

Good

LaSalle County, Illinois · .25 MI N of US 6 · Structure no. 050201700000000

Built
1985
40 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
38 ft
1 main span
Daily traffic
1,825
2020 count
Owner
State
State Highway Agency

About this bridge

FAU6121 & I-39 SB over Conveyor Belt is a concrete culvert carrying FAU6121 & I-39 SB over Conveyor Belt in LaSalle County, Illinois. It was built in 1985, so it is 40 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,825 vehicles a day, roughly 25% of them trucks, projected to reach 2,125 by 2046. The structure is 38 ft (11.7 m) long and 64 ft wide.

Location

Open in Google Maps
CarriesFAU6121 & I-39 SB
CrossesConveyor Belt
Location.25 MI N of US 6
CountyLaSalle County
StateIllinois
Coordinates41.33752, -89.07251
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74.6 US tons
Inventory rating44.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length38 ft (11.7 m)
Longest span35 ft (10.7 m)
Deck width64 ft (19.5 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,825 (2020)
Projected traffic2,125 by 2046
Trucks25%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was FAU6121 & I-39 SB over Conveyor Belt built?

It was built in 1985, making it 40 years old in 2025.

What condition is FAU6121 & I-39 SB over Conveyor Belt in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does FAU6121 & I-39 SB over Conveyor Belt carry?

About 1,825 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is FAU6121 & I-39 SB over Conveyor Belt?

The structure is 38 ft (11.7 m) long with a longest span of 35 ft (10.7 m) and a deck 64 ft wide.

Who owns FAU6121 & I-39 SB over Conveyor Belt?

It is owned by the State Highway Agency.