US Bridges

Il 21 (milwaukee) over RR - UP

Fair

Cook County, Illinois · 0.7 SE I-294 · Structure no. 016024300000000

Built
1970
55 years old, rebuilt 2008
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
166 ft
3 main spans
Daily traffic
28,400
2023 count
Owner
State
State Highway Agency

About this bridge

Il 21 (milwaukee) over RR - UP is a prestressed concrete box beam or girders - multiple carrying Il 21 (milwaukee) over RR - UP in Cook County, Illinois. It was built in 1970 and reconstructed in 2008, so it is 55 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 28,400 vehicles a day, roughly 4% of them trucks, projected to reach 8,131 by 2046. The structure is 166 ft (50.7 m) long and 82 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIl 21 (milwaukee)
CrossesRR - UP
Location0.7 SE I-294
RouteState Highway 21
CountyCook County
StateIllinois
Coordinates42.07436, -87.85739
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 alignment6: Equal to present minimum criteria
Operating rating98.2 US tons
Inventory rating71.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length166 ft (50.7 m)
Longest span54 ft (16.6 m)
Deck width82 ft (25 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,400 (2023)
Projected traffic8,131 by 2046
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed3.7 mi (6 km)
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$1.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 21 (milwaukee) over RR - UP built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2008.

What condition is Il 21 (milwaukee) over RR - UP 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 2023.

How much traffic does Il 21 (milwaukee) over RR - UP carry?

About 28,400 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Il 21 (milwaukee) over RR - UP?

The structure is 166 ft (50.7 m) long with a longest span of 54 ft (16.6 m) and a deck 82 ft wide.

Who owns Il 21 (milwaukee) over RR - UP?

It is owned by the State Highway Agency.