US Bridges

WB I-74 over E. Main ST

Fair

Knox County, Illinois · Galesburg Interch · Structure no. 048001000000000

Built
1963
62 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
187 ft
4 main spans
Daily traffic
9,500
2023 count
Owner
State
State Highway Agency

About this bridge

WB I-74 over E. Main ST is a steel continuous stringer/multi-beam or girder carrying WB I-74 over E. Main ST in Knox County, Illinois. It was built in 1963, so it is 62 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 9,500 vehicles a day, roughly 26% of them trucks, projected to reach 9,444 by 2046. The structure is 187 ft (57 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWB I-74
CrossesE. Main ST
LocationGalesburg Interch
RouteInterstate 74
CountyKnox County
StateIllinois
Coordinates40.94686, -90.33384
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
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 inspectionDecember 2023
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 geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74.3 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length187 ft (57 m)
Longest span56 ft (17.1 m)
Deck width51 ft (15.6 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,500 (2023)
Projected traffic9,444 by 2046
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 WB I-74 over E. Main ST built?

It was built in 1963, making it 62 years old in 2025.

What condition is WB I-74 over E. Main ST 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 December 2023.

How much traffic does WB I-74 over E. Main ST carry?

About 9,500 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is WB I-74 over E. Main ST?

The structure is 187 ft (57 m) long with a longest span of 56 ft (17.1 m) and a deck 51 ft wide.

Who owns WB I-74 over E. Main ST?

It is owned by the State Highway Agency.