US Bridges

Il 171 (archer Ave over US 12 20 45 Lagrange

Fair

Cook County, Illinois · 0.5 M SW I-294 · Structure no. 016275600000000

Built
2003
22 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
219 ft
2 main spans
Daily traffic
9,200
2023 count
Owner
State
State Highway Agency

About this bridge

Il 171 (archer Ave over US 12 20 45 Lagrange is a steel continuous stringer/multi-beam or girder carrying Il 171 (archer Ave over US 12 20 45 Lagrange in Cook County, Illinois. It was built in 2003, so it is 22 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 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 9,200 vehicles a day, roughly 14% of them trucks, projected to reach 7,676 by 2046. The structure is 219 ft (66.8 m) long and 93 ft wide.

Location

Open in Google Maps
CarriesIl 171 (archer Ave
CrossesUS 12 20 45 Lagrange
Location0.5 M SW I-294
RouteState Highway 171
CountyCook County
StateIllinois
Coordinates41.7437, -87.85207
Functional classUrban Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.7 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length219 ft (66.8 m)
Longest span108 ft (32.9 m)
Deck width93 ft (28.4 m)
Roadway width90 ft (27.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,200 (2023)
Projected traffic7,676 by 2046
Trucks14%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 171 (archer Ave over US 12 20 45 Lagrange built?

It was built in 2003, making it 22 years old in 2025.

What condition is Il 171 (archer Ave over US 12 20 45 Lagrange 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 September 2023.

How much traffic does Il 171 (archer Ave over US 12 20 45 Lagrange carry?

About 9,200 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Il 171 (archer Ave over US 12 20 45 Lagrange?

The structure is 219 ft (66.8 m) long with a longest span of 108 ft (32.9 m) and a deck 93 ft wide.

Who owns Il 171 (archer Ave over US 12 20 45 Lagrange?

It is owned by the State Highway Agency.