US Bridges

TR 117 a over Willow Branch

Fair

Piatt County, Illinois · S Edge Allerton Park · Structure no. 074314700000000

Built
1973
52 years old
Condition
Fair
inspected February 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
70 ft
2 main spans
Daily traffic
25
2020 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 117 a over Willow Branch is a prestressed concrete box beam or girders - multiple carrying TR 117 a over Willow Branch in Piatt County, Illinois. It was built in 1973, so it is 52 years old, older 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 5 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 25 vehicles a day, roughly 20% of them trucks, projected to reach 25 by 2046. The structure is 70 ft (21.2 m) long and 26 ft wide.

Location

Open in Google Maps
CarriesTR 117 a
CrossesWillow Branch
LocationS Edge Allerton Park
RouteCounty Highway 0
CountyPiatt County
StateIllinois
Coordinates39.98158, -88.64708
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating35.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 15
Structure length70 ft (21.2 m)
Longest span33 ft (10.2 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2020)
Projected traffic25 by 2046
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 117 a over Willow Branch built?

It was built in 1973, making it 52 years old in 2025.

What condition is TR 117 a over Willow Branch 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 February 2025.

How much traffic does TR 117 a over Willow Branch carry?

About 25 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is TR 117 a over Willow Branch?

The structure is 70 ft (21.2 m) long with a longest span of 33 ft (10.2 m) and a deck 26 ft wide.

Who owns TR 117 a over Willow Branch?

It is owned by the Town or Township Highway Agency.