US Bridges

I-74 over Swab Run

Fair

Peoria County, Illinois · .2 M E of Knox CO Li · Structure no. 072200900000000

Built
1968
57 years old
Condition
Fair
inspected December 2023
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
15,400
2023 count
Owner
State
State Highway Agency

About this bridge

I-74 over Swab Run is a concrete continuous culvert carrying I-74 over Swab Run in Peoria County, Illinois. It was built in 1968, so it is 57 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 15,400 vehicles a day, roughly 31% of them trucks, projected to reach 15,251 by 2046. The structure is 23 ft (7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-74
CrossesSwab Run
Location.2 M E of Knox CO Li
RouteInterstate 74
CountyPeoria County
StateIllinois
Coordinates40.85128, -89.98106
Functional classRural 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating74.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length23 ft (7 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,400 (2023)
Projected traffic15,251 by 2046
Trucks31%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-74 over Swab Run built?

It was built in 1968, making it 57 years old in 2025.

What condition is I-74 over Swab Run 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 I-74 over Swab Run carry?

About 15,400 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is I-74 over Swab Run?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.3 m).

Who owns I-74 over Swab Run?

It is owned by the State Highway Agency.