US Bridges

TR 108 over Gravel Creek

Fair

Randolph County, Illinois · TR108 over Gravel CR · Structure no. 079423200000000

Built
1961
64 years old
Condition
Fair
inspected January 2025
Type
Channel Beam
Concrete
Length
40 ft
1 main span
Daily traffic
175
2024 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 108 over Gravel Creek is a concrete channel beam carrying TR 108 over Gravel Creek in Randolph County, Illinois. It was built in 1961, so it is 64 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 175 vehicles a day, roughly 9% of them trucks, projected to reach 177 by 2046. The structure is 40 ft (12.2 m) long and 23 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesTR 108
CrossesGravel Creek
LocationTR108 over Gravel CR
RouteCounty Highway 0
Coordinates37.96027, -89.85186
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating31.4 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 15
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2024)
Projected traffic177 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 108 over Gravel Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is TR 108 over Gravel 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 January 2025.

How much traffic does TR 108 over Gravel Creek carry?

About 175 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is TR 108 over Gravel Creek?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 23 ft wide.

Who owns TR 108 over Gravel Creek?

It is owned by the Town or Township Highway Agency.