US Bridges

TR 108 over Unnamed Drainage Dt

Fair

Iroquois County, Illinois · 1 S 1.75 W Chebanse · Structure no. 038364800000000

Built
1983
42 years old
Condition
Fair
inspected September 2023
Type
Culvert
Steel
Length
21 ft
2 main spans
Daily traffic
50
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

TR 108 over Unnamed Drainage Dt is a steel culvert carrying TR 108 over Unnamed Drainage Dt in Iroquois County, Illinois. It was built in 1983, so it is 42 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 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 50 vehicles a day, roughly 24% of them trucks, projected to reach 202 by 2046. The structure is 21 ft (6.3 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesTR 108
CrossesUnnamed Drainage Dt
Location1 S 1.75 W Chebanse
RouteCounty Highway 0
CountyIroquois County
StateIllinois
Coordinates40.98896, -87.94393
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.3 m)
Longest span9 ft (2.7 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic202 by 2046
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Unnamed Drainage Dt built?

It was built in 1983, making it 42 years old in 2025.

What condition is TR 108 over Unnamed Drainage Dt 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 September 2023.

How much traffic does TR 108 over Unnamed Drainage Dt carry?

About 50 vehicles per day (2022 count), of which roughly 24% are trucks.

How long is TR 108 over Unnamed Drainage Dt?

The structure is 21 ft (6.3 m) long with a longest span of 9 ft (2.7 m) and a deck 28 ft wide.

Who owns TR 108 over Unnamed Drainage Dt?

It is owned by the Town or Township Highway Agency.