US Bridges

Ch 39 over Trib to Spoon River

Good

Knox County, Illinois · NE-21-T9NR2E · Structure no. 048334300000000

Built
2006
19 years old
Condition
Good
inspected December 2022
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
125
2022 count
Owner
County
County Highway Agency

About this bridge

Ch 39 over Trib to Spoon River is a concrete culvert carrying Ch 39 over Trib to Spoon River in Knox County, Illinois. It was built in 2006, so it is 19 years old, younger than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 125 vehicles a day, roughly 37% of them trucks, projected to reach 177 by 2046. The structure is 26 ft (8 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesCh 39
CrossesTrib to Spoon River
LocationNE-21-T9NR2E
RouteCounty Highway 0
Coordinates40.75034, -90.27423
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert8 Very GoodNo problems noted.
Last inspectionDecember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (8 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2022)
Projected traffic177 by 2046
Trucks37%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Ch 39 over Trib to Spoon River built?

It was built in 2006, making it 19 years old in 2025.

What condition is Ch 39 over Trib to Spoon River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2022.

How much traffic does Ch 39 over Trib to Spoon River carry?

About 125 vehicles per day (2022 count), of which roughly 37% are trucks.

How long is Ch 39 over Trib to Spoon River?

The structure is 26 ft (8 m) long with a longest span of 12 ft (3.7 m).

Who owns Ch 39 over Trib to Spoon River?

It is owned by the County Highway Agency.