US Bridges

I 80 NB over Iais RR

Fair

Henry County, Illinois · 1.7 MI N JCT US 6 · Structure no. 037002800000000

Built
1965
60 years old, rebuilt 1990
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
158 ft
3 main spans
Daily traffic
10,800
2023 count
Owner
State
State Highway Agency

About this bridge

I 80 NB over Iais RR is a steel continuous stringer/multi-beam or girder carrying I 80 NB over Iais RR in Henry County, Illinois. It was built in 1965 and reconstructed in 1990, so it is 60 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 10,800 vehicles a day, roughly 40% of them trucks, projected to reach 11,016 by 2046. The structure is 158 ft (48.3 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 80 NB
CrossesIais RR
Location1.7 MI N JCT US 6
RouteInterstate 80
CountyHenry County
StateIllinois
Coordinates41.47853, -90.33892
Functional classUrban 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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length158 ft (48.3 m)
Longest span60 ft (18.2 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,800 (2023)
Projected traffic11,016 by 2046
Trucks40%
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 80 NB over Iais RR built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1990.

What condition is I 80 NB over 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 January 2024.

How much traffic does I 80 NB over Iais RR carry?

About 10,800 vehicles per day (2023 count), of which roughly 40% are trucks.

How long is I 80 NB over Iais RR?

The structure is 158 ft (48.3 m) long with a longest span of 60 ft (18.2 m) and a deck 43 ft wide.

Who owns I 80 NB over Iais RR?

It is owned by the State Highway Agency.