US Bridges

US 52 FAP 607 over Unknown Stream

Fair

LaSalle County, Illinois · 1.8 MI W of Il 71 · Structure no. 050203700000000

Built
1931
94 years old
Condition
Fair
inspected February 2023
Type
Culvert
Concrete
Length
36 ft
2 main spans
Daily traffic
1,850
2023 count
Owner
State
State Highway Agency

About this bridge

US 52 FAP 607 over Unknown Stream is a concrete culvert carrying US 52 FAP 607 over Unknown Stream in LaSalle County, Illinois. It was built in 1931, so it is 94 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 13% of them trucks, projected to reach 2,323 by 2046. The structure is 36 ft (11 m) long and 56 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesUS 52 FAP 607
CrossesUnknown Stream
Location1.8 MI W of Il 71
RouteU.S. Route 52
CountyLaSalle County
StateIllinois
Coordinates41.48554, -88.67949
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.8 US tons
Inventory rating43.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length36 ft (11 m)
Longest span9 ft (2.8 m)
Deck width56 ft (17.2 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,850 (2023)
Projected traffic2,323 by 2046
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 US 52 FAP 607 over Unknown Stream built?

It was built in 1931, making it 94 years old in 2025.

What condition is US 52 FAP 607 over Unknown Stream 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 FAP 607 over Unknown Stream carry?

About 1,850 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is US 52 FAP 607 over Unknown Stream?

The structure is 36 ft (11 m) long with a longest span of 9 ft (2.8 m) and a deck 56 ft wide.

Who owns US 52 FAP 607 over Unknown Stream?

It is owned by the State Highway Agency.