US Bridges

US 150 over Interstate 74

Fair

Knox County, Illinois · 1 MI E of Knoxville · Structure no. 048003000000000

Built
1963
62 years old, rebuilt 2002
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
226 ft
4 main spans
Daily traffic
2,600
2023 count
Owner
State
State Highway Agency

About this bridge

US 150 over Interstate 74 is a steel continuous stringer/multi-beam or girder carrying US 150 over Interstate 74 in Knox County, Illinois. It was built in 1963 and reconstructed in 2002, 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 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 2,600 vehicles a day, roughly 7% of them trucks, projected to reach 2,525 by 2046. The structure is 226 ft (68.9 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 150
CrossesInterstate 74
Location1 MI E of Knoxville
RouteU.S. Route 150
CountyKnox County
StateIllinois
Coordinates40.91118, -90.24855
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98.2 US tons
Inventory rating62.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length226 ft (68.9 m)
Longest span73 ft (22.4 m)
Deck width36 ft (11 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2023)
Projected traffic2,525 by 2046
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$800,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 150 over Interstate 74 built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2002.

What condition is US 150 over Interstate 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 July 2024.

How much traffic does US 150 over Interstate 74 carry?

About 2,600 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 150 over Interstate 74?

The structure is 226 ft (68.9 m) long with a longest span of 73 ft (22.4 m) and a deck 36 ft wide.

Who owns US 150 over Interstate 74?

It is owned by the State Highway Agency.