US Bridges

Willow Knolls Road over C&nw RR

Fair

Peoria County, Illinois · 1MI E Orange Prairie · Structure no. 072309300000000

Built
1977
48 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
177 ft
3 main spans
Daily traffic
10,500
2022 count
Owner
County
County Highway Agency

About this bridge

Willow Knolls Road over C&nw RR is a steel continuous stringer/multi-beam or girder carrying Willow Knolls Road over C&nw RR in Peoria County, Illinois. It was built in 1977, so it is 48 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 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 10,500 vehicles a day, roughly 4% of them trucks, projected to reach 11,009 by 2046. The structure is 177 ft (53.9 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWillow Knolls Road
CrossesC&nw RR
Location1MI E Orange Prairie
CountyPeoria County
StateIllinois
Coordinates40.77621, -89.65263
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70.8 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length177 ft (53.9 m)
Longest span65 ft (19.8 m)
Deck width46 ft (14 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,500 (2022)
Projected traffic11,009 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Willow Knolls Road over C&nw RR built?

It was built in 1977, making it 48 years old in 2025.

What condition is Willow Knolls Road over C&nw RR 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 September 2024.

How much traffic does Willow Knolls Road over C&nw RR carry?

About 10,500 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Willow Knolls Road over C&nw RR?

The structure is 177 ft (53.9 m) long with a longest span of 65 ft (19.8 m) and a deck 46 ft wide.

Who owns Willow Knolls Road over C&nw RR?

It is owned by the County Highway Agency.