US Bridges

Il 21 (milwaukee) over US 14 (dempster)

Fair

Cook County, Illinois · 1.2 M S E of Il 58 · Structure no. 016257200000000

Built
1990
35 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
67 ft
1 main span
Daily traffic
27,000
2023 count
Owner
State
State Highway Agency

About this bridge

Il 21 (milwaukee) over US 14 (dempster) is a steel stringer/multi-beam or girder carrying Il 21 (milwaukee) over US 14 (dempster) in Cook County, Illinois. It was built in 1990, so it is 35 years old, younger 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 27,000 vehicles a day, roughly 3% of them trucks, projected to reach 26,664 by 2046. The structure is 67 ft (20.5 m) long and 99 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIl 21 (milwaukee)
CrossesUS 14 (dempster)
Location1.2 M S E of Il 58
RouteState Highway 21
CountyCook County
StateIllinois
Coordinates42.0403, -87.82649
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment7: Better than present minimum criteria
Operating rating89.3 US tons
Inventory rating53.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length67 ft (20.5 m)
Longest span65 ft (19.8 m)
Deck width99 ft (30.2 m)
Roadway width73 ft (22.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,000 (2023)
Projected traffic26,664 by 2046
Trucks3%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 21 (milwaukee) over US 14 (dempster) built?

It was built in 1990, making it 35 years old in 2025.

What condition is Il 21 (milwaukee) over US 14 (dempster) 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 Il 21 (milwaukee) over US 14 (dempster) carry?

About 27,000 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Il 21 (milwaukee) over US 14 (dempster)?

The structure is 67 ft (20.5 m) long with a longest span of 65 ft (19.8 m) and a deck 99 ft wide.

Who owns Il 21 (milwaukee) over US 14 (dempster)?

It is owned by the State Highway Agency.