US Bridges

Il 31 over RR - BNSF

Fair

Kane County, Illinois · 0.5 M S of US 30 · Structure no. 047000600000000

Built
1960
65 years old, rebuilt 1990
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
350 ft
5 main spans
Daily traffic
14,200
2023 count
Owner
State
State Highway Agency

About this bridge

Il 31 over RR - BNSF is a steel continuous stringer/multi-beam or girder carrying Il 31 over RR - BNSF in Kane County, Illinois. It was built in 1960 and reconstructed in 1990, so it is 65 years old, older 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 14,200 vehicles a day, roughly 6% of them trucks, projected to reach 14,896 by 2046. The structure is 350 ft (106.6 m) long and 70 ft wide.

Location

Open in Google Maps
CarriesIl 31
CrossesRR - BNSF
Location0.5 M S of US 30
RouteState Highway 31
CountyKane County
StateIllinois
Coordinates41.71675, -88.35548
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating58.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length350 ft (106.6 m)
Longest span110 ft (33.5 m)
Deck width70 ft (21.2 m)
Roadway width64 ft (19.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,200 (2023)
Projected traffic14,896 by 2046
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Il 31 over RR - BNSF built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1990.

What condition is Il 31 over RR - BNSF 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 February 2024.

How much traffic does Il 31 over RR - BNSF carry?

About 14,200 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Il 31 over RR - BNSF?

The structure is 350 ft (106.6 m) long with a longest span of 110 ft (33.5 m) and a deck 70 ft wide.

Who owns Il 31 over RR - BNSF?

It is owned by the State Highway Agency.