US Bridges

Il 71 over Intermit Stream

Good

LaSalle County, Illinois · 5.90 MI E of Il 178 · Structure no. 050024300000000

Built
2007
18 years old
Condition
Good
inspected January 2021
Type
Slab
Concrete Continuous
Length
83 ft
2 main spans
Daily traffic
1,700
2023 count
Owner
State
State Highway Agency

About this bridge

Il 71 over Intermit Stream is a concrete continuous slab carrying Il 71 over Intermit Stream in LaSalle County, Illinois. It was built in 2007, so it is 18 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,700 vehicles a day, roughly 4% of them trucks, projected to reach 1,364 by 2046. The structure is 83 ft (25.3 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesIl 71
CrossesIntermit Stream
Location5.90 MI E of Il 178
RouteState Highway 71
CountyLaSalle County
StateIllinois
Coordinates41.3163, -88.90921
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating42.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length83 ft (25.3 m)
Longest span40 ft (12.2 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2023)
Projected traffic1,364 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 71 over Intermit Stream built?

It was built in 2007, making it 18 years old in 2025.

What condition is Il 71 over Intermit Stream in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2021.

How much traffic does Il 71 over Intermit Stream carry?

About 1,700 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Il 71 over Intermit Stream?

The structure is 83 ft (25.3 m) long with a longest span of 40 ft (12.2 m) and a deck 35 ft wide.

Who owns Il 71 over Intermit Stream?

It is owned by the State Highway Agency.