US Bridges

US 34 FAP 587 over I-39/US 51

Fair

LaSalle County, Illinois · Intchg US 34 & 1-39 · Structure no. 050016500000000

Built
1977
48 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
214 ft
2 main spans
Daily traffic
1,850
2023 count
Owner
State
State Highway Agency

About this bridge

US 34 FAP 587 over I-39/US 51 is a steel continuous stringer/multi-beam or girder carrying US 34 FAP 587 over I-39/US 51 in LaSalle County, Illinois. It was built in 1977, so it is 48 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 1,850 vehicles a day, roughly 15% of them trucks, projected to reach 2,172 by 2046. The structure is 214 ft (65.1 m) long and 64 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 34 FAP 587
CrossesI-39/US 51
LocationIntchg US 34 & 1-39
RouteU.S. Route 34
CountyLaSalle County
StateIllinois
Coordinates41.55425, -89.06082
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.3 US tons
Inventory rating42.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length214 ft (65.1 m)
Longest span106 ft (32.3 m)
Deck width64 ft (19.5 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,850 (2023)
Projected traffic2,172 by 2046
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 34 FAP 587 over I-39/US 51 built?

It was built in 1977, making it 48 years old in 2025.

What condition is US 34 FAP 587 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 March 2023.

How much traffic does US 34 FAP 587 over I-39/US 51 carry?

About 1,850 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 34 FAP 587 over I-39/US 51?

The structure is 214 ft (65.1 m) long with a longest span of 106 ft (32.3 m) and a deck 64 ft wide.

Who owns US 34 FAP 587 over I-39/US 51?

It is owned by the State Highway Agency.