US Bridges

I-180 WB over IL29(SBI29A)&IAIS RR

Fair

Bureau County, Illinois · 2 Mi. SW Bureau Jct. · Structure no. 006005800000000

Built
1968
57 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
384 ft
4 main spans
Daily traffic
2,700
2023 count
Owner
State
State Highway Agency

About this bridge

I-180 WB over IL29(SBI29A)&IAIS RR is a steel continuous stringer/multi-beam or girder carrying I-180 WB over IL29(SBI29A)&IAIS RR in Bureau County, Illinois. It was built in 1968, so it is 57 years old, older 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 2,700 vehicles a day, roughly 32% of them trucks, projected to reach 2,525 by 2046. The structure is 384 ft (117 m) long and 73 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesI-180 WB
CrossesIL29(SBI29A)&IAIS RR
Location2 Mi. SW Bureau Jct.
RouteInterstate 180
CountyBureau County
StateIllinois
Coordinates41.26482, -89.39086
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 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 rating75.4 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length384 ft (117 m)
Longest span112 ft (34.1 m)
Deck width73 ft (22.3 m)
Roadway width70 ft (21.2 m)
Vertical clearance over deck23 ft (6.9 m)

Traffic and service

Average daily traffic2,700 (2023)
Projected traffic2,525 by 2046
Trucks32%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed18 mi (29 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-180 WB over IL29(SBI29A)&IAIS RR built?

It was built in 1968, making it 57 years old in 2025.

What condition is I-180 WB over IL29(SBI29A)&IAIS 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 February 2023.

How much traffic does I-180 WB over IL29(SBI29A)&IAIS RR carry?

About 2,700 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is I-180 WB over IL29(SBI29A)&IAIS RR?

The structure is 384 ft (117 m) long with a longest span of 112 ft (34.1 m) and a deck 73 ft wide.

Who owns I-180 WB over IL29(SBI29A)&IAIS RR?

It is owned by the State Highway Agency.