US Bridges

I-39/US 51 over Stream

Fair

Marshall County, Illinois · 2.38 MI N of Ill 17 · Structure no. 062200600000000

Built
1991
34 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
39 ft
2 main spans
Daily traffic
16,500
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 Marshall County, Illinois. It was built in 1991, so it is 34 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 5 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 16,500 vehicles a day, roughly 39% of them trucks, projected to reach 14,645 by 2046. The structure is 39 ft (11.8 m) long and 84 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-39/US 51
CrossesStream
Location2.38 MI N of Ill 17
RouteInterstate 39
CountyMarshall County
StateIllinois
Coordinates41.06021, -89.06689
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.4 US tons
Inventory rating53.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length39 ft (11.8 m)
Longest span15 ft (4.6 m)
Deck width84 ft (25.6 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,500 (2023)
Projected traffic14,645 by 2046
Trucks39%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 1991, making it 34 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 March 2023.

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

About 16,500 vehicles per day (2023 count), of which roughly 39% are trucks.

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

The structure is 39 ft (11.8 m) long with a longest span of 15 ft (4.6 m) and a deck 84 ft wide.

Who owns I-39/US 51 over Stream?

It is owned by the State Highway Agency.