US Bridges

County Highway 41 over Coon Creek

Fair

Iroquois County, Illinois · 6.30 MI S of US-24 · Structure no. 038006300000000

Built
1954
71 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete
Length
38 ft
1 main span
Daily traffic
350
2022 count
Owner
County
County Highway Agency

About this bridge

County Highway 41 over Coon Creek is a concrete tee beam carrying County Highway 41 over Coon Creek in Iroquois County, Illinois. It was built in 1954, so it is 71 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 350 vehicles a day, roughly 10% of them trucks, projected to reach 429 by 2046. The structure is 38 ft (11.6 m) long and 29 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCounty Highway 41
CrossesCoon Creek
Location6.30 MI S of US-24
RouteCounty Highway 0
CountyIroquois County
StateIllinois
Coordinates40.68505, -87.5931
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.9 US tons
Inventory rating43.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span37 ft (11.2 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2022)
Projected traffic429 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Highway 41 over Coon Creek built?

It was built in 1954, making it 71 years old in 2025.

What condition is County Highway 41 over Coon 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 July 2024.

How much traffic does County Highway 41 over Coon Creek carry?

About 350 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is County Highway 41 over Coon Creek?

The structure is 38 ft (11.6 m) long with a longest span of 37 ft (11.2 m) and a deck 29 ft wide.

Who owns County Highway 41 over Coon Creek?

It is owned by the County Highway Agency.