US Bridges

Ill 18 over Eagle CR

Fair

LaSalle County, Illinois · 1.70 Mi.W.Of Ill 23 · Structure no. 050200600000000

Built
1972
53 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
26 ft
3 main spans
Daily traffic
3,550
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 18 over Eagle CR is a concrete continuous culvert carrying Ill 18 over Eagle CR in LaSalle County, Illinois. It was built in 1972, so it is 53 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 5 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 3,550 vehicles a day, roughly 13% of them trucks, projected to reach 3,990 by 2046. The structure is 26 ft (8 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIll 18
CrossesEagle CR
Location1.70 Mi.W.Of Ill 23
RouteState Highway 18
CountyLaSalle County
StateIllinois
Coordinates41.12074, -88.86842
Functional classUrban Other Principal Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating98.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length26 ft (8 m)
Longest span8 ft (2.4 m)
Deck width44 ft (13.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,550 (2023)
Projected traffic3,990 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 Ill 18 over Eagle CR built?

It was built in 1972, making it 53 years old in 2025.

What condition is Ill 18 over Eagle 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 August 2024.

How much traffic does Ill 18 over Eagle CR carry?

About 3,550 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Ill 18 over Eagle CR?

The structure is 26 ft (8 m) long with a longest span of 8 ft (2.4 m) and a deck 44 ft wide.

Who owns Ill 18 over Eagle CR?

It is owned by the State Highway Agency.