US Bridges

I-39/US 51(SB) over TR 39 (frtg RD West)

Fair

Marshall County, Illinois · 3.36 MI S of Ill 18 · Structure no. 062004500000000

Built
1991
34 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
129 ft
3 main spans
Daily traffic
8,250
2023 count
Owner
State
State Highway Agency

About this bridge

I-39/US 51(SB) over TR 39 (frtg RD West) is a prestressed concrete continuous stringer/multi-beam or girder carrying I-39/US 51(SB) over TR 39 (frtg RD West) 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 8,250 vehicles a day, roughly 39% of them trucks, projected to reach 7,323 by 2046. The structure is 129 ft (39.3 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-39/US 51(SB)
CrossesTR 39 (frtg RD West)
Location3.36 MI S of Ill 18
RouteInterstate 39
CountyMarshall County
StateIllinois
Coordinates41.07213, -89.06721
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length129 ft (39.3 m)
Longest span53 ft (16.2 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,250 (2023)
Projected traffic7,323 by 2046
Trucks39%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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(SB) over TR 39 (frtg RD West) built?

It was built in 1991, making it 34 years old in 2025.

What condition is I-39/US 51(SB) over TR 39 (frtg RD West) 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(SB) over TR 39 (frtg RD West) carry?

About 8,250 vehicles per day (2023 count), of which roughly 39% are trucks.

How long is I-39/US 51(SB) over TR 39 (frtg RD West)?

The structure is 129 ft (39.3 m) long with a longest span of 53 ft (16.2 m) and a deck 43 ft wide.

Who owns I-39/US 51(SB) over TR 39 (frtg RD West)?

It is owned by the State Highway Agency.