US Bridges

I-39/US 51 SB over BNSF RR

Fair

Marshall County, Illinois · 1.15 MI S of Ill 17 · Structure no. 062005100000000

Built
1989
36 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
165 ft
3 main spans
Daily traffic
8,000
2023 count
Owner
State
State Highway Agency

About this bridge

I-39/US 51 SB over BNSF RR is a prestressed concrete continuous stringer/multi-beam or girder carrying I-39/US 51 SB over BNSF RR in Marshall 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 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 8,000 vehicles a day, roughly 39% of them trucks, projected to reach 9,040 by 2046. The structure is 165 ft (50.3 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
CrossesBNSF RR
Location1.15 MI S of Ill 17
RouteInterstate 39
CountyMarshall County
StateIllinois
Coordinates41.01076, -89.0562
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
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 rating75.7 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length165 ft (50.3 m)
Longest span63 ft (19.2 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,000 (2023)
Projected traffic9,040 by 2046
Trucks39%
Lanes on structure2
Traffic directionOne-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 SB over BNSF RR built?

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

What condition is I-39/US 51 SB over BNSF RR 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 2024.

How much traffic does I-39/US 51 SB over BNSF RR carry?

About 8,000 vehicles per day (2023 count), of which roughly 39% are trucks.

How long is I-39/US 51 SB over BNSF RR?

The structure is 165 ft (50.3 m) long with a longest span of 63 ft (19.2 m) and a deck 43 ft wide.

Who owns I-39/US 51 SB over BNSF RR?

It is owned by the State Highway Agency.