US Bridges

Il 71 FAP 311 over I-80

Fair

LaSalle County, Illinois · Junction Il 71 · Structure no. 050021700000000

Built
1995
30 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
236 ft
2 main spans
Daily traffic
6,000
2023 count
Owner
State
State Highway Agency

About this bridge

Il 71 FAP 311 over I-80 is a steel continuous stringer/multi-beam or girder carrying Il 71 FAP 311 over I-80 in LaSalle County, Illinois. It was built in 1995, so it is 30 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 6,000 vehicles a day, roughly 19% of them trucks, projected to reach 7,424 by 2046. The structure is 236 ft (72 m) long and 69 ft wide.

Location

Open in Google Maps
CarriesIl 71 FAP 311
CrossesI-80
LocationJunction Il 71
RouteState Highway 71
CountyLaSalle County
StateIllinois
Coordinates41.37658, -88.77858
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.7 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length236 ft (72 m)
Longest span115 ft (35.1 m)
Deck width69 ft (21.1 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2023)
Projected traffic7,424 by 2046
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 71 FAP 311 over I-80 built?

It was built in 1995, making it 30 years old in 2025.

What condition is Il 71 FAP 311 over I-80 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 March 2023.

How much traffic does Il 71 FAP 311 over I-80 carry?

About 6,000 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is Il 71 FAP 311 over I-80?

The structure is 236 ft (72 m) long with a longest span of 115 ft (35.1 m) and a deck 69 ft wide.

Who owns Il 71 FAP 311 over I-80?

It is owned by the State Highway Agency.