US Bridges

NB Ill 6 over Charter Oak Road

Fair

Peoria County, Illinois · 1 MI N of I-74 · Structure no. 072013800000000

Built
1978
47 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
138 ft
3 main spans
Daily traffic
28,400
2023 count
Owner
State
State Highway Agency

About this bridge

NB Ill 6 over Charter Oak Road is a prestressed concrete continuous stringer/multi-beam or girder carrying NB Ill 6 over Charter Oak Road in Peoria County, Illinois. It was built in 1978, so it is 47 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 28,400 vehicles a day, roughly 7% of them trucks, projected to reach 13,989 by 2046. The structure is 138 ft (42.1 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNB Ill 6
CrossesCharter Oak Road
Location1 MI N of I-74
RouteState Highway 6
CountyPeoria County
StateIllinois
Coordinates40.75466, -89.67136
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionMay 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.3 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length138 ft (42.1 m)
Longest span63 ft (19.2 m)
Deck width42 ft (12.7 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,400 (2023)
Projected traffic13,989 by 2046
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 NB Ill 6 over Charter Oak Road built?

It was built in 1978, making it 47 years old in 2025.

What condition is NB Ill 6 over Charter Oak Road 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 May 2023.

How much traffic does NB Ill 6 over Charter Oak Road carry?

About 28,400 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is NB Ill 6 over Charter Oak Road?

The structure is 138 ft (42.1 m) long with a longest span of 63 ft (19.2 m) and a deck 42 ft wide.

Who owns NB Ill 6 over Charter Oak Road?

It is owned by the State Highway Agency.