US Bridges

I-39/US 51 over Conveyor Belt/Pvt RD

Fair

LaSalle County, Illinois · 0.43 MI S of US 6 · Structure no. 050019600000000

Built
1985
40 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
43 ft
1 main span
Daily traffic
19,400
2023 count
Owner
State
State Highway Agency

About this bridge

I-39/US 51 over Conveyor Belt/Pvt RD is a steel stringer/multi-beam or girder carrying I-39/US 51 over Conveyor Belt/Pvt RD 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 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 19,400 vehicles a day, roughly 38% of them trucks, projected to reach 19,291 by 2046. The structure is 43 ft (13.1 m) long and 88 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-39/US 51
CrossesConveyor Belt/Pvt RD
Location0.43 MI S of US 6
RouteInterstate 39
CountyLaSalle County
StateIllinois
Coordinates41.33046, -89.07421
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.9 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span40 ft (12.2 m)
Deck width88 ft (26.9 m)
Roadway width82 ft (25 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,400 (2023)
Projected traffic19,291 by 2046
Trucks38%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-39/US 51 over Conveyor Belt/Pvt RD built?

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

What condition is I-39/US 51 over Conveyor Belt/Pvt 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 February 2024.

How much traffic does I-39/US 51 over Conveyor Belt/Pvt RD carry?

About 19,400 vehicles per day (2023 count), of which roughly 38% are trucks.

How long is I-39/US 51 over Conveyor Belt/Pvt RD?

The structure is 43 ft (13.1 m) long with a longest span of 40 ft (12.2 m) and a deck 88 ft wide.

Who owns I-39/US 51 over Conveyor Belt/Pvt RD?

It is owned by the State Highway Agency.