US Bridges

US 52 over I-39/US 51

Fair

LaSalle County, Illinois · Troy Grove · Structure no. 050017100000000

Built
1977
48 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
211 ft
2 main spans
Daily traffic
1,350
2023 count
Owner
State
State Highway Agency

About this bridge

US 52 over I-39/US 51 is a steel continuous stringer/multi-beam or girder carrying US 52 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 1,350 vehicles a day, roughly 28% of them trucks, projected to reach 1,212 by 2046. The structure is 211 ft (64.4 m) long and 68 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 52
CrossesI-39/US 51
LocationTroy Grove
RouteU.S. Route 52
CountyLaSalle County
StateIllinois
Coordinates41.46992, -89.05041
Functional classRural 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 inspectionFebruary 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 rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length211 ft (64.4 m)
Longest span105 ft (32 m)
Deck width68 ft (20.7 m)
Roadway width47 ft (14.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,350 (2023)
Projected traffic1,212 by 2046
Trucks28%
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 52 over I-39/US 51 built?

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

What condition is US 52 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 February 2023.

How much traffic does US 52 over I-39/US 51 carry?

About 1,350 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is US 52 over I-39/US 51?

The structure is 211 ft (64.4 m) long with a longest span of 105 ft (32 m) and a deck 68 ft wide.

Who owns US 52 over I-39/US 51?

It is owned by the State Highway Agency.