US Bridges

I-90 over US 12/41 US 20/41

Fair

Lake County, Indiana · 04.10 W US 41 · Structure no. 045850

Built
1956
69 years old, rebuilt 1989
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
1,150 ft
21 main spans
Daily traffic
36,713
2011 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-90 over US 12/41 US 20/41 is a steel stringer/multi-beam or girder carrying I-90 over US 12/41 US 20/41 in Lake County, Indiana. It was built in 1956 and reconstructed in 1989, 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 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 36,713 vehicles a day, roughly 14% of them trucks, projected to reach 81,379 by 2031. The structure is 1,150 ft (350.5 m) long and 76 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI-90
CrossesUS 12/41 US 20/41
Location04.10 W US 41
RouteInterstate 90
CountyLake County
StateIndiana
Coordinates41.70298, -87.52446
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans21
Design loadHS 20
Structure length1,150 ft (350.5 m)
Longest span62 ft (18.8 m)
Deck width76 ft (23.1 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,713 (2011)
Projected traffic81,379 by 2031
Trucks14%
Lanes on structure4
Traffic directionTwo-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 over US 12/41 US 20/41 built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1989.

What condition is I-90 over US 12/41 US 20/41 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 November 2023.

How much traffic does I-90 over US 12/41 US 20/41 carry?

About 36,713 vehicles per day (2011 count), of which roughly 14% are trucks.

How long is I-90 over US 12/41 US 20/41?

The structure is 1,150 ft (350.5 m) long with a longest span of 62 ft (18.8 m) and a deck 76 ft wide.

Who owns I-90 over US 12/41 US 20/41?

It is owned by the State Toll Authority.