US Bridges

TR 56 over Thunder Creek

Fair

Grundy County, Illinois · 300 S Prairie RD · Structure no. 032489100000000

Built
2008
17 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
25
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 56 over Thunder Creek is a concrete culvert carrying TR 56 over Thunder Creek in Grundy County, Illinois. It was built in 2008, so it is 17 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 25 vehicles a day, projected to reach 30 by 2046. The structure is 26 ft (7.9 m) long.

Location

Open in Google Maps
CarriesTR 56
CrossesThunder Creek
Location300 S Prairie RD
RouteCounty Highway 0
CountyGrundy County
StateIllinois
Coordinates41.2092, -88.51109
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length26 ft (7.9 m)
Longest span13 ft (3.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2024)
Projected traffic30 by 2046
Trucks0%
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 56 over Thunder Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is TR 56 over Thunder 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 October 2024.

How much traffic does TR 56 over Thunder Creek carry?

About 25 vehicles per day (2024 count).

How long is TR 56 over Thunder Creek?

The structure is 26 ft (7.9 m) long with a longest span of 13 ft (3.9 m).

Who owns TR 56 over Thunder Creek?

It is owned by the Town or Township Highway Agency.