US Bridges

Il 171 NB Elevated over Sta 53&15 to 63&18

Fair

Cook County, Illinois · 0.5 M SE Joliet RD · Structure no. 016245600000000

Built
1964
61 years old, rebuilt 2016
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
966 ft
12 main spans
Daily traffic
40,100
2023 count
Owner
State
State Highway Agency

About this bridge

Il 171 NB Elevated over Sta 53&15 to 63&18 is a steel continuous stringer/multi-beam or girder carrying Il 171 NB Elevated over Sta 53&15 to 63&18 in Cook County, Illinois. It was built in 1964 and reconstructed in 2016, so it is 61 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 40,100 vehicles a day, roughly 9% of them trucks, projected to reach 19,443 by 2046. The structure is 966 ft (294.4 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesIl 171 NB Elevated
CrossesSta 53&15 to 63&18
Location0.5 M SE Joliet RD
RouteState Highway 171
CountyCook County
StateIllinois
Coordinates41.79555, -87.82668
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
Deck8 Very GoodNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length966 ft (294.4 m)
Longest span133 ft (40.4 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,100 (2023)
Projected traffic19,443 by 2046
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed5 mi (8 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6.7 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 171 NB Elevated over Sta 53&15 to 63&18 built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2016.

What condition is Il 171 NB Elevated over Sta 53&15 to 63&18 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 December 2023.

How much traffic does Il 171 NB Elevated over Sta 53&15 to 63&18 carry?

About 40,100 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Il 171 NB Elevated over Sta 53&15 to 63&18?

The structure is 966 ft (294.4 m) long with a longest span of 133 ft (40.4 m) and a deck 36 ft wide.

Who owns Il 171 NB Elevated over Sta 53&15 to 63&18?

It is owned by the State Highway Agency.