US Bridges

Duffy Lane over Interstate 94

Fair

Lake County, Illinois · I94 .8M S Ill 22 · Structure no. 049991000000000

Built
1958
67 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
253 ft
4 main spans
Daily traffic
1,750
2023 count
Owner
County
County Highway Agency

About this bridge

Duffy Lane over Interstate 94 is a prestressed concrete stringer/multi-beam or girder carrying Duffy Lane over Interstate 94 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 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 1,750 vehicles a day, roughly 3% of them trucks, projected to reach 2,424 by 2046. The structure is 253 ft (77.1 m) long and 34 ft wide.

Location

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CarriesDuffy Lane
CrossesInterstate 94
LocationI94 .8M S Ill 22
CountyLake County
StateIllinois
Coordinates42.18928, -87.88065
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
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 rating89.3 US tons
Inventory rating53.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length253 ft (77.1 m)
Longest span76 ft (23.2 m)
Deck width34 ft (10.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,750 (2023)
Projected traffic2,424 by 2046
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Duffy Lane over Interstate 94 built?

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

What condition is Duffy Lane over Interstate 94 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 Duffy Lane over Interstate 94 carry?

About 1,750 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Duffy Lane over Interstate 94?

The structure is 253 ft (77.1 m) long with a longest span of 76 ft (23.2 m) and a deck 34 ft wide.

Who owns Duffy Lane over Interstate 94?

It is owned by the County Highway Agency.