US Bridges

Ill 50 over So. Br. Rock Cr.

Fair

Kankakee County, Illinois · S. Edge of Manteno · Structure no. 046012200000000

Built
1997
28 years old
Condition
Fair
inspected January 2023
Type
Slab
Concrete Continuous
Length
131 ft
5 main spans
Daily traffic
9,000
2023 count
Owner
State
State Highway Agency

About this bridge

Ill 50 over So. Br. Rock Cr. is a concrete continuous slab carrying Ill 50 over So. Br. Rock Cr. in Kankakee County, Illinois. It was built in 1997, so it is 28 years old, younger 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 6 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 9,000 vehicles a day, roughly 5% of them trucks, projected to reach 9,945 by 2046. The structure is 131 ft (40 m) long and 66 ft wide.

Location

Open in Google Maps
CarriesIll 50
CrossesSo. Br. Rock Cr.
LocationS. Edge of Manteno
RouteState Highway 50
CountyKankakee County
StateIllinois
Coordinates41.24172, -87.83643
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment7: Better than present minimum criteria
Operating rating65.7 US tons
Inventory rating39.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length131 ft (40 m)
Longest span32 ft (9.8 m)
Deck width66 ft (20 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2023)
Projected traffic9,945 by 2046
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Ill 50 over So. Br. Rock Cr. built?

It was built in 1997, making it 28 years old in 2025.

What condition is Ill 50 over So. Br. Rock Cr. 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 January 2023.

How much traffic does Ill 50 over So. Br. Rock Cr. carry?

About 9,000 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Ill 50 over So. Br. Rock Cr.?

The structure is 131 ft (40 m) long with a longest span of 32 ft (9.8 m) and a deck 66 ft wide.

Who owns Ill 50 over So. Br. Rock Cr.?

It is owned by the State Highway Agency.