US Bridges

Il 81 over I-74

Fair

Henry County, Illinois · 1.8 Mi. W. Andover · Structure no. 037016600000000

Built
1999
26 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
218 ft
2 main spans
Daily traffic
2,000
2023 count
Owner
State
State Highway Agency

About this bridge

Il 81 over I-74 is a steel continuous stringer/multi-beam or girder carrying Il 81 over I-74 in Henry County, Illinois. It was built in 1999, so it is 26 years old, younger 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 2,000 vehicles a day, roughly 12% of them trucks, projected to reach 2,376 by 2046. The structure is 218 ft (66.4 m) long and 65 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesIl 81
CrossesI-74
Location1.8 Mi. W. Andover
RouteState Highway 81
CountyHenry County
StateIllinois
Coordinates41.29538, -90.33457
Functional classRural Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.1 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length218 ft (66.4 m)
Longest span110 ft (33.6 m)
Deck width65 ft (19.9 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2023)
Projected traffic2,376 by 2046
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

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 81 over I-74 built?

It was built in 1999, making it 26 years old in 2025.

What condition is Il 81 over I-74 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 March 2023.

How much traffic does Il 81 over I-74 carry?

About 2,000 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Il 81 over I-74?

The structure is 218 ft (66.4 m) long with a longest span of 110 ft (33.6 m) and a deck 65 ft wide.

Who owns Il 81 over I-74?

It is owned by the State Highway Agency.