US Bridges

Il 40 over Skunk Creek

Fair

Whiteside County, Illinois · 6 Mi. N. of Sterling · Structure no. 098010100000000

Built
1994
31 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
68 ft
1 main span
Daily traffic
2,600
2021 count
Owner
State
State Highway Agency

About this bridge

Il 40 over Skunk Creek is a prestressed concrete stringer/multi-beam or girder carrying Il 40 over Skunk Creek in Whiteside County, Illinois. It was built in 1994, so it is 31 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 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 11% of them trucks, projected to reach 2,626 by 2046. The structure is 68 ft (20.6 m) long and 43 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesIl 40
CrossesSkunk Creek
Location6 Mi. N. of Sterling
RouteState Highway 40
CountyWhiteside County
StateIllinois
Coordinates41.89751, -89.72595
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.8 US tons
Inventory rating48.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length68 ft (20.6 m)
Longest span63 ft (19.1 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2021)
Projected traffic2,626 by 2046
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 40 over Skunk Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Il 40 over Skunk Creek 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 Il 40 over Skunk Creek carry?

About 2,600 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is Il 40 over Skunk Creek?

The structure is 68 ft (20.6 m) long with a longest span of 63 ft (19.1 m) and a deck 43 ft wide.

Who owns Il 40 over Skunk Creek?

It is owned by the State Highway Agency.