US Bridges

TR 56A over Trib. S Henderson CR

Good

Knox County, Illinois · NE-15-T12NR1E · Structure no. 048332200000000

Built
1989
36 years old
Condition
Good
inspected February 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
75
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 56A over Trib. S Henderson CR is a prestressed concrete box beam or girders - multiple carrying TR 56A over Trib. S Henderson CR in Knox County, Illinois. It was built in 1989, so it is 36 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 75 vehicles a day, roughly 37% of them trucks, projected to reach 126 by 2046. The structure is 52 ft (15.7 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesTR 56A
CrossesTrib. S Henderson CR
LocationNE-15-T12NR1E
RouteCounty Highway 0
CountyKnox County
StateIllinois
Coordinates41.0298, -90.36586
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length52 ft (15.7 m)
Longest span49 ft (14.9 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic126 by 2046
Trucks37%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 56A over Trib. S Henderson CR built?

It was built in 1989, making it 36 years old in 2025.

What condition is TR 56A over Trib. S Henderson CR 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 TR 56A over Trib. S Henderson CR carry?

About 75 vehicles per day (2022 count), of which roughly 37% are trucks.

How long is TR 56A over Trib. S Henderson CR?

The structure is 52 ft (15.7 m) long with a longest span of 49 ft (14.9 m) and a deck 24 ft wide.

Who owns TR 56A over Trib. S Henderson CR?

It is owned by the Town or Township Highway Agency.