US Bridges

Il 31 over RR - Metra

Fair

Kane County, Illinois · 0.8 M S of I-90 · Structure no. 045001600000000

Built
1952
73 years old, rebuilt 2012
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
246 ft
3 main spans
Daily traffic
21,000
2023 count
Owner
State
State Highway Agency

About this bridge

Il 31 over RR - Metra is a steel continuous stringer/multi-beam or girder carrying Il 31 over RR - Metra in Kane County, Illinois. It was built in 1952 and reconstructed in 2012, so it is 73 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 21,000 vehicles a day, roughly 5% of them trucks, projected to reach 26,840 by 2046. The structure is 246 ft (75 m) long and 59 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesIl 31
CrossesRR - Metra
Location0.8 M S of I-90
RouteState Highway 31
CountyKane County
StateIllinois
Coordinates42.05553, -88.29502
Functional classUrban 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
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 2025
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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating62.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length246 ft (75 m)
Longest span93 ft (28.4 m)
Deck width59 ft (17.9 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,000 (2023)
Projected traffic26,840 by 2046
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed8.1 mi (13 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 31 over RR - Metra built?

It was built in 1952, making it 73 years old in 2025. It was reconstructed in 2012.

What condition is Il 31 over RR - Metra 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 2025.

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

About 21,000 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Il 31 over RR - Metra?

The structure is 246 ft (75 m) long with a longest span of 93 ft (28.4 m) and a deck 59 ft wide.

Who owns Il 31 over RR - Metra?

It is owned by the State Highway Agency.