US Bridges

I-39/US 51 SB over FAS 472 Ch 12

Good

McLean County, Illinois · 4.65 MI N of I-55 · Structure no. 057020500000000

Built
1989
36 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
170 ft
1 main span
Daily traffic
9,550
2023 count
Owner
State
State Highway Agency

About this bridge

I-39/US 51 SB over FAS 472 Ch 12 is a steel stringer/multi-beam or girder carrying I-39/US 51 SB over FAS 472 Ch 12 in McLean County, Illinois. It was built in 1989, so it is 36 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,550 vehicles a day, roughly 34% of them trucks, projected to reach 10,201 by 2046. The structure is 170 ft (51.8 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesI-39/US 51 SB
CrossesFAS 472 Ch 12
Location4.65 MI N of I-55
RouteInterstate 39
CountyMcLean County
StateIllinois
Coordinates40.60638, -88.9989
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.4 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length170 ft (51.8 m)
Longest span120 ft (36.5 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,550 (2023)
Projected traffic10,201 by 2046
Trucks34%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-39/US 51 SB over FAS 472 Ch 12 built?

It was built in 1989, making it 36 years old in 2025.

What condition is I-39/US 51 SB over FAS 472 Ch 12 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 May 2023.

How much traffic does I-39/US 51 SB over FAS 472 Ch 12 carry?

About 9,550 vehicles per day (2023 count), of which roughly 34% are trucks.

How long is I-39/US 51 SB over FAS 472 Ch 12?

The structure is 170 ft (51.8 m) long with a longest span of 120 ft (36.5 m) and a deck 43 ft wide.

Who owns I-39/US 51 SB over FAS 472 Ch 12?

It is owned by the State Highway Agency.