US Bridges

TR 421 over Little Vermilion Riv

Fair

Vermilion County, Illinois · 3.5 MI NE Allerton · Structure no. 092344000000000

Built
1993
32 years old
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
81 ft
1 main span
Daily traffic
20
2023 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 421 over Little Vermilion Riv is a prestressed concrete box beam or girders - multiple carrying TR 421 over Little Vermilion Riv in Vermilion County, Illinois. It was built in 1993, so it is 32 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 20 vehicles a day, roughly 10% of them trucks, projected to reach 20 by 2046. The structure is 81 ft (24.8 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesTR 421
CrossesLittle Vermilion Riv
Location3.5 MI NE Allerton
RouteCounty Highway 0
CountyVermilion County
StateIllinois
Coordinates39.93844, -87.87925
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 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 length81 ft (24.8 m)
Longest span80 ft (24.4 m)
Deck width27 ft (8.2 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2023)
Projected traffic20 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 421 over Little Vermilion Riv built?

It was built in 1993, making it 32 years old in 2025.

What condition is TR 421 over Little Vermilion Riv 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 2024.

How much traffic does TR 421 over Little Vermilion Riv carry?

About 20 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is TR 421 over Little Vermilion Riv?

The structure is 81 ft (24.8 m) long with a longest span of 80 ft (24.4 m) and a deck 27 ft wide.

Who owns TR 421 over Little Vermilion Riv?

It is owned by the Town or Township Highway Agency.