US Bridges

Il 170 FAP 786 over Il River & River RD

Fair

LaSalle County, Illinois · S of US Rt 6 · Structure no. 050024600000000

Built
2009
16 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,704 ft
10 main spans
Daily traffic
4,750
2023 count
Owner
State
State Highway Agency

About this bridge

Il 170 FAP 786 over Il River & River RD is a steel continuous stringer/multi-beam or girder carrying Il 170 FAP 786 over Il River & River RD in LaSalle County, Illinois. It was built in 2009, so it is 16 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 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 4,750 vehicles a day, roughly 13% of them trucks, projected to reach 5,757 by 2046. The structure is 1,704 ft (519.3 m) long and 39 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesIl 170 FAP 786
CrossesIl River & River RD
LocationS of US Rt 6
RouteState Highway 170
CountyLaSalle County
StateIllinois
Coordinates41.30086, -88.60898
Functional classRural 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.6 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length1,704 ft (519.3 m)
Longest span370 ft (112.8 m)
Deck width39 ft (11.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,750 (2023)
Projected traffic5,757 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Il 170 FAP 786 over Il River & River RD built?

It was built in 2009, making it 16 years old in 2025.

What condition is Il 170 FAP 786 over Il River & River RD 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 August 2023.

How much traffic does Il 170 FAP 786 over Il River & River RD carry?

About 4,750 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Il 170 FAP 786 over Il River & River RD?

The structure is 1,704 ft (519.3 m) long with a longest span of 370 ft (112.8 m) and a deck 39 ft wide.

Who owns Il 170 FAP 786 over Il River & River RD?

It is owned by the State Highway Agency.