US Bridges

Old US 34 over Cedar CR Trib

Fair

Warren County, Illinois · .5 MI E of Monmouth · Structure no. 094005000000000

Built
2002
23 years old
Condition
Fair
inspected December 2023
Type
Slab
Concrete Continuous
Length
80 ft
2 main spans
Daily traffic
450
2021 count
Owner
State
State Highway Agency

About this bridge

Old US 34 over Cedar CR Trib is a concrete continuous slab carrying Old US 34 over Cedar CR Trib in Warren County, Illinois. It was built in 2002, so it is 23 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 450 vehicles a day, roughly 3% of them trucks, projected to reach 455 by 2046. The structure is 80 ft (24.4 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesOld US 34
CrossesCedar CR Trib
Location.5 MI E of Monmouth
CountyWarren County
StateIllinois
Coordinates40.91918, -90.6212
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionDecember 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.8 US tons
Inventory rating43.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span40 ft (12.2 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2021)
Projected traffic455 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Old US 34 over Cedar CR Trib built?

It was built in 2002, making it 23 years old in 2025.

What condition is Old US 34 over Cedar CR Trib 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 Old US 34 over Cedar CR Trib carry?

About 450 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Old US 34 over Cedar CR Trib?

The structure is 80 ft (24.4 m) long with a longest span of 40 ft (12.2 m) and a deck 29 ft wide.

Who owns Old US 34 over Cedar CR Trib?

It is owned by the State Highway Agency.