US Bridges

N. 2575th/FAU 6126 over I-39/US 51

Fair

LaSalle County, Illinois · 2.21 M1 S.Of US 6 · Structure no. 050019800000000

Built
1986
39 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
249 ft
2 main spans
Daily traffic
325
2020 count
Owner
State
State Highway Agency

About this bridge

N. 2575th/FAU 6126 over I-39/US 51 is a prestressed concrete stringer/multi-beam or girder carrying N. 2575th/FAU 6126 over I-39/US 51 in LaSalle County, Illinois. It was built in 1986, so it is 39 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 6 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 325 vehicles a day, roughly 6% of them trucks, projected to reach 328 by 2046. The structure is 249 ft (75.9 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesN. 2575th/FAU 6126
CrossesI-39/US 51
Location2.21 M1 S.Of US 6
CountyLaSalle County
StateIllinois
Coordinates41.30608, -89.08316
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating69.7 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length249 ft (75.9 m)
Longest span100 ft (30.5 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic325 (2020)
Projected traffic328 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was N. 2575th/FAU 6126 over I-39/US 51 built?

It was built in 1986, making it 39 years old in 2025.

What condition is N. 2575th/FAU 6126 over I-39/US 51 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 January 2023.

How much traffic does N. 2575th/FAU 6126 over I-39/US 51 carry?

About 325 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is N. 2575th/FAU 6126 over I-39/US 51?

The structure is 249 ft (75.9 m) long with a longest span of 100 ft (30.5 m) and a deck 31 ft wide.

Who owns N. 2575th/FAU 6126 over I-39/US 51?

It is owned by the State Highway Agency.