US Bridges

Il 29TO I-180NB Ra over I-180NB Ramp to IL29

Fair

Bureau County, Illinois · 1.21 M N of Il 29 · Structure no. 006008500000000

Built
1968
57 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
373 ft
3 main spans
Daily traffic
2,200
2023 count
Owner
State
State Highway Agency

About this bridge

Il 29TO I-180NB Ra over I-180NB Ramp to IL29 is a steel continuous stringer/multi-beam or girder carrying Il 29TO I-180NB Ra over I-180NB Ramp to IL29 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 6 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 2,200 vehicles a day, roughly 15% of them trucks, projected to reach 985 by 2046. The structure is 373 ft (113.6 m) long and 43 ft wide.

Location

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CarriesIl 29TO I-180NB Ra
CrossesI-180NB Ramp to IL29
Location1.21 M N of Il 29
CountyBureau County
StateIllinois
Coordinates41.26306, -89.39989
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.4 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length373 ft (113.6 m)
Longest span187 ft (57.1 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic985 by 2046
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 Il 29TO I-180NB Ra over I-180NB Ramp to IL29 built?

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

What condition is Il 29TO I-180NB Ra over I-180NB Ramp to IL29 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 2023.

How much traffic does Il 29TO I-180NB Ra over I-180NB Ramp to IL29 carry?

About 2,200 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is Il 29TO I-180NB Ra over I-180NB Ramp to IL29?

The structure is 373 ft (113.6 m) long with a longest span of 187 ft (57.1 m) and a deck 43 ft wide.

Who owns Il 29TO I-180NB Ra over I-180NB Ramp to IL29?

It is owned by the State Highway Agency.