US Bridges

I-180 NB over I-80

Fair

Bureau County, Illinois · 4 MI E. of Princeton · Structure no. 006003800000000

Built
1968
57 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
273 ft
2 main spans
Daily traffic
1,650
2023 count
Owner
State
State Highway Agency

About this bridge

I-180 NB over I-80 is a steel continuous stringer/multi-beam or girder carrying I-180 NB over I-80 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 1,650 vehicles a day, roughly 20% of them trucks, projected to reach 1,768 by 2046. The structure is 273 ft (83.3 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesI-180 NB
CrossesI-80
Location4 MI E. of Princeton
RouteInterstate 180
CountyBureau County
StateIllinois
Coordinates41.4001, -89.38433
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 inspectionJanuary 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length273 ft (83.3 m)
Longest span102 ft (31 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,650 (2023)
Projected traffic1,768 by 2046
Trucks20%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 NB over I-80 built?

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

What condition is I-180 NB over I-80 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 January 2024.

How much traffic does I-180 NB over I-80 carry?

About 1,650 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I-180 NB over I-80?

The structure is 273 ft (83.3 m) long with a longest span of 102 ft (31 m) and a deck 30 ft wide.

Who owns I-180 NB over I-80?

It is owned by the State Highway Agency.