US Bridges

I- 55 SB over US 30

Fair

Will County, Illinois · 7.2 M N of I-80 · Structure no. 099001600000000

Built
1955
70 years old, rebuilt 2007
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
191 ft
4 main spans
Daily traffic
32,700
2024 count
Owner
State
State Highway Agency

About this bridge

I- 55 SB over US 30 is a steel continuous stringer/multi-beam or girder carrying I- 55 SB over US 30 in Will County, Illinois. It was built in 1955 and reconstructed in 2007, 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 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 32,700 vehicles a day, roughly 17% of them trucks, projected to reach 42,120 by 2046. The structure is 191 ft (58.2 m) long and 55 ft wide.

Location

Open in Google Maps
CarriesI- 55 SB
CrossesUS 30
Location7.2 M N of I-80
RouteInterstate 55
CountyWill County
StateIllinois
Coordinates41.58371, -88.1686
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.2 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length191 ft (58.2 m)
Longest span54 ft (16.4 m)
Deck width55 ft (16.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,700 (2024)
Projected traffic42,120 by 2046
Trucks17%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I- 55 SB over US 30 built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2007.

What condition is I- 55 SB over US 30 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 SB over US 30 carry?

About 32,700 vehicles per day (2024 count), of which roughly 17% are trucks.

How long is I- 55 SB over US 30?

The structure is 191 ft (58.2 m) long with a longest span of 54 ft (16.4 m) and a deck 55 ft wide.

Who owns I- 55 SB over US 30?

It is owned by the State Highway Agency.