US Bridges

Il 251/FAP 46 over I-39/US 51

Poor

LaSalle County, Illinois · 0.5 Mi. N. Il 71 · Structure no. 050020000000000

Built
1986
39 years old
Condition
Poor
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
411 ft
2 main spans
Daily traffic
—
2023 count
Owner
State
State Highway Agency

About this bridge

Il 251/FAP 46 over I-39/US 51 is a steel continuous stringer/multi-beam or girder carrying Il 251/FAP 46 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

No traffic count is recorded. The structure is 411 ft (125.4 m) long and 69 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIl 251/FAP 46
CrossesI-39/US 51
Location0.5 Mi. N. Il 71
RouteState Highway 251
CountyLaSalle County
StateIllinois
Coordinates41.27573, -89.08162
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating49.6 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length411 ft (125.4 m)
Longest span154 ft (46.8 m)
Deck width69 ft (21.1 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic4,091 by 2046
Trucks0%
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 SystemYes

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 Il 251/FAP 46 over I-39/US 51 built?

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

What condition is Il 251/FAP 46 over I-39/US 51 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2024.

How much traffic does Il 251/FAP 46 over I-39/US 51 carry?

No traffic count is recorded for this structure.

How long is Il 251/FAP 46 over I-39/US 51?

The structure is 411 ft (125.4 m) long with a longest span of 154 ft (46.8 m) and a deck 69 ft wide.

Who owns Il 251/FAP 46 over I-39/US 51?

It is owned by the State Highway Agency.