US Bridges

Il 120 WB over Stream

Fair

Lake County, Illinois · 0.1 M W of Il 21 · Structure no. 049004400000000

Built
1960
65 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
31 ft
1 main span
Daily traffic
27,900
2023 count
Owner
State
State Highway Agency

About this bridge

Il 120 WB over Stream is a concrete slab carrying Il 120 WB over Stream in Lake County, Illinois. It was built in 1960, so it is 65 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 27,900 vehicles a day, roughly 6% of them trucks, projected to reach 13,080 by 2046. The structure is 31 ft (9.6 m) long and 42 ft wide.

Location

Open in Google Maps
CarriesIl 120 WB
CrossesStream
Location0.1 M W of Il 21
RouteState Highway 120
CountyLake County
StateIllinois
Coordinates42.3433, -87.94719
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating32.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length31 ft (9.6 m)
Longest span30 ft (9.1 m)
Deck width42 ft (12.9 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,900 (2023)
Projected traffic13,080 by 2046
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$144,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 120 WB over Stream built?

It was built in 1960, making it 65 years old in 2025.

What condition is Il 120 WB over Stream 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 July 2023.

How much traffic does Il 120 WB over Stream carry?

About 27,900 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Il 120 WB over Stream?

The structure is 31 ft (9.6 m) long with a longest span of 30 ft (9.1 m) and a deck 42 ft wide.

Who owns Il 120 WB over Stream?

It is owned by the State Highway Agency.