US Bridges

I-180 Eb/Sb over I-180 NB Ent Ramp

Fair

Bureau County, Illinois · 3.8 MI W Il 26 · Structure no. 006005500000000

Built
1968
57 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
328 ft
3 main spans
Daily traffic
1,350
2023 count
Owner
State
State Highway Agency

About this bridge

I-180 Eb/Sb over I-180 NB Ent Ramp is a steel continuous stringer/multi-beam or girder carrying I-180 Eb/Sb over I-180 NB Ent Ramp 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 1,350 vehicles a day, roughly 32% of them trucks, projected to reach 1,263 by 2046. The structure is 328 ft (100.1 m) long and 43 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesI-180 Eb/Sb
CrossesI-180 NB Ent Ramp
Location3.8 MI W Il 26
RouteInterstate 180
CountyBureau County
StateIllinois
Coordinates41.26693, -89.39848
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 inspectionFebruary 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.7 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length328 ft (100.1 m)
Longest span160 ft (48.8 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic1,350 (2023)
Projected traffic1,263 by 2046
Trucks32%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed6.8 mi (11 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 Eb/Sb over I-180 NB Ent Ramp built?

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

What condition is I-180 Eb/Sb over I-180 NB Ent Ramp 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 2024.

How much traffic does I-180 Eb/Sb over I-180 NB Ent Ramp carry?

About 1,350 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is I-180 Eb/Sb over I-180 NB Ent Ramp?

The structure is 328 ft (100.1 m) long with a longest span of 160 ft (48.8 m) and a deck 43 ft wide.

Who owns I-180 Eb/Sb over I-180 NB Ent Ramp?

It is owned by the State Highway Agency.