US Bridges

I-94 NB over Des Plaines River

Fair

Lake County, Illinois · I94 .7M N Ill 120 · Structure no. 049992200000000

Built
1958
67 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
202 ft
3 main spans
Daily traffic
47,800
2022 count
Owner
Toll Authority
State Toll Authority

About this bridge

I-94 NB over Des Plaines River is a prestressed concrete stringer/multi-beam or girder carrying I-94 NB over Des Plaines River in Lake County, Illinois. It was built in 1958, so it is 67 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 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 47,800 vehicles a day, roughly 21% of them trucks, projected to reach 37,673 by 2046. The structure is 202 ft (61.6 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-94 NB
CrossesDes Plaines River
LocationI94 .7M N Ill 120
RouteInterstate 94
CountyLake County
StateIllinois
Coordinates42.35328, -87.93075
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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length202 ft (61.6 m)
Longest span66 ft (20.1 m)
Deck width39 ft (12 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,800 (2022)
Projected traffic37,673 by 2046
Trucks21%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-94 NB over Des Plaines River built?

It was built in 1958, making it 67 years old in 2025.

What condition is I-94 NB over Des Plaines River 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 2024.

How much traffic does I-94 NB over Des Plaines River carry?

About 47,800 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is I-94 NB over Des Plaines River?

The structure is 202 ft (61.6 m) long with a longest span of 66 ft (20.1 m) and a deck 39 ft wide.

Who owns I-94 NB over Des Plaines River?

It is owned by the State Toll Authority.