US Bridges

Thomson RD over Little Rock Creek

Fair

Carroll County, Illinois · 5 MI SW Chadwick · Structure no. 008410800000000

Built
1932
93 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete
Length
44 ft
1 main span
Daily traffic
50
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Thomson RD over Little Rock Creek is a concrete tee beam carrying Thomson RD over Little Rock Creek in Carroll County, Illinois. It was built in 1932, so it is 93 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 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 50 vehicles a day, projected to reach 51 by 2046. The structure is 44 ft (13.3 m) long and 21 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesThomson RD
CrossesLittle Rock Creek
Location5 MI SW Chadwick
RouteCounty Highway 0
CountyCarroll County
StateIllinois
Coordinates41.9603, -89.94534
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length44 ft (13.3 m)
Longest span42 ft (12.9 m)
Deck width21 ft (6.3 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2021)
Projected traffic51 by 2046
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$122,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Thomson RD over Little Rock Creek built?

It was built in 1932, making it 93 years old in 2025.

What condition is Thomson RD over Little Rock 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 April 2024.

How much traffic does Thomson RD over Little Rock Creek carry?

About 50 vehicles per day (2021 count).

How long is Thomson RD over Little Rock Creek?

The structure is 44 ft (13.3 m) long with a longest span of 42 ft (12.9 m) and a deck 21 ft wide.

Who owns Thomson RD over Little Rock Creek?

It is owned by the Town or Township Highway Agency.