US Bridges

I-39 & US 51 over Stream

Fair

Ogle County, Illinois · 1.75 MI S of Il 64 · Structure no. 071201000000000

Built
1981
44 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
84 ft
3 main spans
Daily traffic
29,600
2023 count
Owner
State
State Highway Agency

About this bridge

I-39 & US 51 over Stream is a concrete culvert carrying I-39 & US 51 over Stream in Ogle County, Illinois. It was built in 1981, so it is 44 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 29,600 vehicles a day, roughly 35% of them trucks, projected to reach 30,680 by 2046. The structure is 84 ft (25.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-39 & US 51
CrossesStream
Location1.75 MI S of Il 64
RouteInterstate 39
CountyOgle County
StateIllinois
Coordinates41.98136, -89.02043
Functional classRural 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.1 US tons
Inventory rating36.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length84 ft (25.5 m)
Longest span28 ft (8.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,600 (2023)
Projected traffic30,680 by 2046
Trucks35%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-39 & US 51 over Stream built?

It was built in 1981, making it 44 years old in 2025.

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

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

About 29,600 vehicles per day (2023 count), of which roughly 35% are trucks.

How long is I-39 & US 51 over Stream?

The structure is 84 ft (25.5 m) long with a longest span of 28 ft (8.4 m).

Who owns I-39 & US 51 over Stream?

It is owned by the State Highway Agency.