US Bridges

I-55/74 (nb & Sb) over Unnamed Creek

Fair

McLean County, Illinois · 1 MI N of Il 9 · Structure no. 057202600000000

Built
1991
34 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
42,100
2023 count
Owner
State
State Highway Agency

About this bridge

I-55/74 (nb & Sb) over Unnamed Creek is a concrete continuous culvert carrying I-55/74 (nb & Sb) over Unnamed Creek in McLean County, Illinois. It was built in 1991, so it is 34 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 42,100 vehicles a day, roughly 38% of them trucks, projected to reach 42,925 by 2046. The structure is 22 ft (6.8 m) long.

Location

Open in Google Maps
CarriesI-55/74 (nb & Sb)
CrossesUnnamed Creek
Location1 MI N of Il 9
RouteInterstate 55
CountyMcLean County
StateIllinois
Coordinates40.50086, -89.02855
Functional classUrban Principal Arterial - Interstate

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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.8 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,100 (2023)
Projected traffic42,925 by 2046
Trucks38%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-55/74 (nb & Sb) over Unnamed Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is I-55/74 (nb & Sb) over Unnamed Creek 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 May 2023.

How much traffic does I-55/74 (nb & Sb) over Unnamed Creek carry?

About 42,100 vehicles per day (2023 count), of which roughly 38% are trucks.

How long is I-55/74 (nb & Sb) over Unnamed Creek?

The structure is 22 ft (6.8 m) long with a longest span of 11 ft (3.3 m).

Who owns I-55/74 (nb & Sb) over Unnamed Creek?

It is owned by the State Highway Agency.