US Bridges

Irene RD over Unnamed Crk

Good

Boone County, Illinois · 0.25 MI S of US 20 · Structure no. 004501200000000

Built
1900
125 years old, rebuilt 2008
Condition
Good
inspected August 2024
Type
Culvert
Concrete
Length
39 ft
3 main spans
Daily traffic
3,200
2018 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Irene RD over Unnamed Crk is a concrete culvert carrying Irene RD over Unnamed Crk in Boone County, Illinois. It was built in 1900 and reconstructed in 2008, so it is 125 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,200 vehicles a day, roughly 21% of them trucks, projected to reach 3,328 by 2046. The structure is 39 ft (11.9 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIrene RD
CrossesUnnamed Crk
Location0.25 MI S of US 20
RouteCounty Highway 0
Coordinates42.23626, -88.90062
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span12 ft (3.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2018)
Projected traffic3,328 by 2046
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Irene RD over Unnamed Crk built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 2008.

What condition is Irene RD over Unnamed Crk in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does Irene RD over Unnamed Crk carry?

About 3,200 vehicles per day (2018 count), of which roughly 21% are trucks.

How long is Irene RD over Unnamed Crk?

The structure is 39 ft (11.9 m) long with a longest span of 12 ft (3.6 m).

Who owns Irene RD over Unnamed Crk?

It is owned by the Town or Township Highway Agency.