US Bridges

I-90 WB over SR 312/CHICAGO ST

Fair

Lake County, Indiana · 01.31 E US 41 · Structure no. 046120

Built
1956
69 years old, rebuilt 1985
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
336 ft
3 main spans
Daily traffic
18,425
2015 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-90 WB over SR 312/CHICAGO ST is a steel stringer/multi-beam or girder carrying I-90 WB over SR 312/CHICAGO ST in Lake County, Indiana. It was built in 1956 and reconstructed in 1985, so it is 69 years old, older than the Indiana average of 46.6 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 18,425 vehicles a day, roughly 11% of them trucks, projected to reach 41,903 by 2031. The structure is 336 ft (102.4 m) long and 35 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI-90 WB
CrossesSR 312/CHICAGO ST
Location01.31 E US 41
RouteInterstate 90
CountyLake County
StateIndiana
Coordinates41.62901, -87.4977
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating100 US tons
Inventory rating60.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length336 ft (102.4 m)
Longest span134 ft (40.8 m)
Deck width35 ft (10.6 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,425 (2015)
Projected traffic41,903 by 2031
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
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-90 WB over SR 312/CHICAGO ST built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1985.

What condition is I-90 WB over SR 312/CHICAGO ST 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 June 2023.

How much traffic does I-90 WB over SR 312/CHICAGO ST carry?

About 18,425 vehicles per day (2015 count), of which roughly 11% are trucks.

How long is I-90 WB over SR 312/CHICAGO ST?

The structure is 336 ft (102.4 m) long with a longest span of 134 ft (40.8 m) and a deck 35 ft wide.

Who owns I-90 WB over SR 312/CHICAGO ST?

It is owned by the State Toll Authority.