US Bridges

Il 170 over BNSF Railroad

Good

LaSalle County, Illinois · 4.7 M N of Il 17 · Structure no. 050025800000000

Built
2019
6 years old
Condition
Good
inspected January 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
200 ft
3 main spans
Daily traffic
1,400
2023 count
Owner
State
State Highway Agency

About this bridge

Il 170 over BNSF Railroad is a steel continuous stringer/multi-beam or girder carrying Il 170 over BNSF Railroad in LaSalle County, Illinois. It was built in 2019, so it is 6 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 1,400 vehicles a day, roughly 19% of them trucks, projected to reach 1,414 by 2046. The structure is 200 ft (61 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIl 170
CrossesBNSF Railroad
Location4.7 M N of Il 17
RouteState Highway 170
CountyLaSalle County
StateIllinois
Coordinates41.15934, -88.6446
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.
Last inspectionJanuary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating44.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length200 ft (61 m)
Longest span80 ft (24.4 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2023)
Projected traffic1,414 by 2046
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 170 over BNSF Railroad built?

It was built in 2019, making it 6 years old in 2025.

What condition is Il 170 over BNSF Railroad 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 2022.

How much traffic does Il 170 over BNSF Railroad carry?

About 1,400 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is Il 170 over BNSF Railroad?

The structure is 200 ft (61 m) long with a longest span of 80 ft (24.4 m) and a deck 35 ft wide.

Who owns Il 170 over BNSF Railroad?

It is owned by the State Highway Agency.