US Bridges

Il 83 171 (kinger over Cal Sag Channel

Fair

Cook County, Illinois · .1MI S of 171 N JCT · Structure no. 016042700000000

Built
1934
91 years old, rebuilt 1997
Condition
Fair
inspected June 2023
Type
Truss - Thru
Steel
Length
508 ft
1 main span
Daily traffic
20,500
2023 count
Owner
State
State Highway Agency

About this bridge

Il 83 171 (kinger over Cal Sag Channel is a steel truss - thru carrying Il 83 171 (kinger over Cal Sag Channel in Cook County, Illinois. It was built in 1934 and reconstructed in 1997, so it is 91 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 20,500 vehicles a day, roughly 4% of them trucks, projected to reach 25,856 by 2046. The structure is 508 ft (154.8 m) long and 55 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesIl 83 171 (kinger
CrossesCal Sag Channel
Location.1MI S of 171 N JCT
RouteState Highway 83
CountyCook County
StateIllinois
Coordinates41.69643, -87.9364
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60.7 US tons
Inventory rating36.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 20
Structure length508 ft (154.8 m)
Longest span304 ft (92.8 m)
Deck width55 ft (16.9 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,500 (2023)
Projected traffic25,856 by 2046
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Il 83 171 (kinger over Cal Sag Channel built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1997.

What condition is Il 83 171 (kinger over Cal Sag Channel 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 2023.

How much traffic does Il 83 171 (kinger over Cal Sag Channel carry?

About 20,500 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Il 83 171 (kinger over Cal Sag Channel?

The structure is 508 ft (154.8 m) long with a longest span of 304 ft (92.8 m) and a deck 55 ft wide.

Who owns Il 83 171 (kinger over Cal Sag Channel?

It is owned by the State Highway Agency.