US Bridges

TR 7A over Rock Creek

Good

Kankakee County, Illinois · 2.3 MI NE of Manteno · Structure no. 046347800000000

Built
1999
26 years old
Condition
Good
inspected April 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
53 ft
1 main span
Daily traffic
100
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 7A over Rock Creek is a prestressed concrete box beam or girders - multiple carrying TR 7A over Rock Creek in Kankakee County, Illinois. It was built in 1999, so it is 26 years old, younger 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 100 vehicles a day, roughly 17% of them trucks, projected to reach 102 by 2046. The structure is 53 ft (16.3 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesTR 7A
CrossesRock Creek
Location2.3 MI NE of Manteno
RouteCounty Highway 0
Coordinates41.28015, -87.79105
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length53 ft (16.3 m)
Longest span52 ft (16 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2021)
Projected traffic102 by 2046
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 TR 7A over Rock Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is TR 7A over Rock 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 April 2022.

How much traffic does TR 7A over Rock Creek carry?

About 100 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is TR 7A over Rock Creek?

The structure is 53 ft (16.3 m) long with a longest span of 52 ft (16 m) and a deck 30 ft wide.

Who owns TR 7A over Rock Creek?

It is owned by the Town or Township Highway Agency.