US Bridges

Irene RD over Trimble Run

Fair

DeKalb County, Illinois · 3575N 240E · Structure no. 019400500000000

Built
1948
77 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete
Length
24 ft
2 main spans
Daily traffic
525
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Irene RD over Trimble Run is a concrete culvert carrying Irene RD over Trimble Run in DeKalb County, Illinois. It was built in 1948, so it is 77 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 525 vehicles a day, roughly 44% of them trucks, projected to reach 588 by 2046. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesIrene RD
CrossesTrimble Run
Location3575N 240E
RouteCounty Highway 0
CountyDeKalb County
StateIllinois
Coordinates42.14906, -88.90066
Functional classRural Local

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 inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.8 US tons
Inventory rating19.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic525 (2021)
Projected traffic588 by 2046
Trucks44%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Trimble Run built?

It was built in 1948, making it 77 years old in 2025.

What condition is Irene RD over Trimble Run 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 February 2024.

How much traffic does Irene RD over Trimble Run carry?

About 525 vehicles per day (2021 count), of which roughly 44% are trucks.

How long is Irene RD over Trimble Run?

The structure is 24 ft (7.3 m) long with a longest span of 11 ft (3.4 m).

Who owns Irene RD over Trimble Run?

It is owned by the Town or Township Highway Agency.