US Bridges

Ill 47 over Fox River

Fair

Kendall County, Illinois · 0.95 MI S of US 34 · Structure no. 047004800000000

Built
1984
41 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
622 ft
7 main spans
Daily traffic
24,800
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 47 over Fox River is a prestressed concrete stringer/multi-beam or girder carrying Ill 47 over Fox River in Kendall County, Illinois. It was built in 1984, so it is 41 years old, younger 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 24,800 vehicles a day, roughly 10% of them trucks, projected to reach 29,526 by 2046. The structure is 622 ft (189.7 m) long and 73 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesIll 47
CrossesFox River
Location0.95 MI S of US 34
RouteState Highway 47
CountyKendall County
StateIllinois
Coordinates41.64442, -88.4464
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.2 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length622 ft (189.7 m)
Longest span90 ft (27.3 m)
Deck width73 ft (22.1 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,800 (2023)
Projected traffic29,526 by 2046
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Ill 47 over Fox River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Ill 47 over Fox River 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 Ill 47 over Fox River carry?

About 24,800 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Ill 47 over Fox River?

The structure is 622 ft (189.7 m) long with a longest span of 90 ft (27.3 m) and a deck 73 ft wide.

Who owns Ill 47 over Fox River?

It is owned by the State Highway Agency.