US Bridges

County Highway 35 over Br of Copperas CR

Fair

Rock Island County, Illinois · 5 M SW Illinois City · Structure no. 081501100000000

Built
1941
84 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
100
2020 count
Owner
County
County Highway Agency

About this bridge

County Highway 35 over Br of Copperas CR is a concrete continuous culvert carrying County Highway 35 over Br of Copperas CR in Rock Island County, Illinois. It was built in 1941, so it is 84 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 100 vehicles a day, roughly 20% of them trucks, projected to reach 101 by 2046. The structure is 22 ft (6.8 m) long. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesCounty Highway 35
CrossesBr of Copperas CR
Location5 M SW Illinois City
RouteCounty Highway 0
CountyRock Island County
StateIllinois
Coordinates41.36112, -90.95711
Functional classRural Minor 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating80.4 US tons
Inventory rating48.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length22 ft (6.8 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2020)
Projected traffic101 by 2046
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 35 over Br of Copperas CR built?

It was built in 1941, making it 84 years old in 2025.

What condition is County Highway 35 over Br of Copperas CR 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 October 2023.

How much traffic does County Highway 35 over Br of Copperas CR carry?

About 100 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is County Highway 35 over Br of Copperas CR?

The structure is 22 ft (6.8 m) long with a longest span of 11 ft (3.3 m).

Who owns County Highway 35 over Br of Copperas CR?

It is owned by the County Highway Agency.