US Bridges

W Knox RD over US 34

Fair

Knox County, Illinois · SW Galesburg Airport · Structure no. 048007800000000

Built
1979
46 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
294 ft
2 main spans
Daily traffic
75
2022 count
Owner
State
State Highway Agency

About this bridge

W Knox RD over US 34 is a steel continuous stringer/multi-beam or girder carrying W Knox RD over US 34 in Knox County, Illinois. It was built in 1979, so it is 46 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 75 vehicles a day, roughly 25% of them trucks, projected to reach 76 by 2046. The structure is 294 ft (89.6 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesW Knox RD
CrossesUS 34
LocationSW Galesburg Airport
CountyKnox County
StateIllinois
Coordinates40.92427, -90.44116
Functional classUrban Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 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 geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64.6 US tons
Inventory rating38.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length294 ft (89.6 m)
Longest span119 ft (36.3 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic76 by 2046
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 W Knox RD over US 34 built?

It was built in 1979, making it 46 years old in 2025.

What condition is W Knox RD over US 34 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 W Knox RD over US 34 carry?

About 75 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is W Knox RD over US 34?

The structure is 294 ft (89.6 m) long with a longest span of 119 ft (36.3 m) and a deck 32 ft wide.

Who owns W Knox RD over US 34?

It is owned by the State Highway Agency.