US Bridges

Irene RD over Trimble Run

Fair

DeKalb County, Illinois · 3500N 240E · Structure no. 019400600000000

Built
1955
70 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
525
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Irene RD over Trimble Run is a concrete slab carrying Irene RD over Trimble Run in DeKalb County, Illinois. It was built in 1955, so it is 70 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 32 ft (9.9 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIrene RD
CrossesTrimble Run
Location3500N 240E
RouteCounty Highway 0
CountyDeKalb County
StateIllinois
Coordinates42.13838, -88.90068
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length32 ft (9.9 m)
Longest span31 ft (9.4 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.3 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 1955, making it 70 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 March 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 32 ft (9.9 m) long with a longest span of 31 ft (9.4 m) and a deck 28 ft wide.

Who owns Irene RD over Trimble Run?

It is owned by the Town or Township Highway Agency.