US Bridges

TR 423 over Little Grassy Creek

Fair

Williamson County, Illinois · 6 MI SW of Cartervil · Structure no. 100309800000000

Built
1978
47 years old
Condition
Fair
inspected February 2024
Type
Channel Beam
Concrete
Length
92 ft
3 main spans
Daily traffic
650
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 423 over Little Grassy Creek is a concrete channel beam carrying TR 423 over Little Grassy Creek in Williamson County, Illinois. It was built in 1978, so it is 47 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 650 vehicles a day, roughly 13% of them trucks, projected to reach 657 by 2046. The structure is 92 ft (28 m) long and 23 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesTR 423
CrossesLittle Grassy Creek
Location6 MI SW of Cartervil
RouteCounty Highway 0
CountyWilliamson County
StateIllinois
Coordinates37.6616, -89.11893
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length92 ft (28 m)
Longest span30 ft (9.1 m)
Deck width23 ft (6.9 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2021)
Projected traffic657 by 2046
Trucks13%
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 423 over Little Grassy Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is TR 423 over Little Grassy Creek 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 423 over Little Grassy Creek carry?

About 650 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is TR 423 over Little Grassy Creek?

The structure is 92 ft (28 m) long with a longest span of 30 ft (9.1 m) and a deck 23 ft wide.

Who owns TR 423 over Little Grassy Creek?

It is owned by the Town or Township Highway Agency.