US Bridges

Il 23 SB in Streat over Prairie Creek

Good

LaSalle County, Illinois · 14.30 MI S of Ill 71 · Structure no. 050005000000000

Built
1965
60 years old
Condition
Good
inspected February 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
7,700
2023 count
Owner
State
State Highway Agency

About this bridge

Il 23 SB in Streat over Prairie Creek is a concrete slab carrying Il 23 SB in Streat over Prairie Creek in LaSalle County, Illinois. It was built in 1965, so it is 60 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,700 vehicles a day, roughly 4% of them trucks, projected to reach 8,282 by 2046. The structure is 23 ft (7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIl 23 SB in Streat
CrossesPrairie Creek
Location14.30 MI S of Ill 71
RouteState Highway 23
Coordinates41.13422, -88.83574
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length23 ft (7 m)
Longest span22 ft (6.7 m)
Deck width43 ft (13 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,700 (2023)
Projected traffic8,282 by 2046
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Il 23 SB in Streat over Prairie Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Il 23 SB in Streat over Prairie Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2023.

How much traffic does Il 23 SB in Streat over Prairie Creek carry?

About 7,700 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Il 23 SB in Streat over Prairie Creek?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.7 m) and a deck 43 ft wide.

Who owns Il 23 SB in Streat over Prairie Creek?

It is owned by the State Highway Agency.