US Bridges

I-39 US 51 over Stream

Good

LaSalle County, Illinois · 1.52 MI S of Ch 54 · Structure no. 050202200000000

Built
1989
36 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete Continuous
Length
30 ft
2 main spans
Daily traffic
19,400
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 US 51 over Stream is a concrete continuous culvert carrying I-39 US 51 over Stream in LaSalle County, Illinois. It was built in 1989, so it is 36 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 19,400 vehicles a day, roughly 36% of them trucks, projected to reach 18,988 by 2046. The structure is 30 ft (9.2 m) long.

Location

Open in Google Maps
CarriesI-39 US 51
CrossesStream
Location1.52 MI S of Ch 54
RouteInterstate 39
CountyLaSalle County
StateIllinois
Coordinates41.19897, -89.07667
Functional classRural 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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating74.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length30 ft (9.2 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,400 (2023)
Projected traffic18,988 by 2046
Trucks36%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-39 US 51 over Stream built?

It was built in 1989, making it 36 years old in 2025.

What condition is I-39 US 51 over Stream 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 2023.

How much traffic does I-39 US 51 over Stream carry?

About 19,400 vehicles per day (2023 count), of which roughly 36% are trucks.

How long is I-39 US 51 over Stream?

The structure is 30 ft (9.2 m) long with a longest span of 14 ft (4.3 m).

Who owns I-39 US 51 over Stream?

It is owned by the State Highway Agency.