US Bridges

I-55 NB over Timber CR

Fair

McLean County, Illinois · 1 MI N of Funksgrove · Structure no. 057016000000000

Built
1975
50 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
196 ft
3 main spans
Daily traffic
11,050
2023 count
Owner
State
State Highway Agency

About this bridge

I-55 NB over Timber CR is a prestressed concrete continuous stringer/multi-beam or girder carrying I-55 NB over Timber CR in McLean County, Illinois. It was built in 1975, so it is 50 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 11,050 vehicles a day, roughly 37% of them trucks, projected to reach 11,615 by 2046. The structure is 196 ft (59.7 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-55 NB
CrossesTimber CR
Location1 MI N of Funksgrove
RouteInterstate 55
CountyMcLean County
StateIllinois
Coordinates40.37358, -89.09721
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.3 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length196 ft (59.7 m)
Longest span64 ft (19.4 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,050 (2023)
Projected traffic11,615 by 2046
Trucks37%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
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 NB over Timber CR built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-55 NB over Timber 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 May 2024.

How much traffic does I-55 NB over Timber CR carry?

About 11,050 vehicles per day (2023 count), of which roughly 37% are trucks.

How long is I-55 NB over Timber CR?

The structure is 196 ft (59.7 m) long with a longest span of 64 ft (19.4 m) and a deck 42 ft wide.

Who owns I-55 NB over Timber CR?

It is owned by the State Highway Agency.