US Bridges

County Highway 37 over Trib.S.Henderson Crk

Fair

Knox County, Illinois · SE-18-T12NR1E · Structure no. 048500300000000

Built
1900
125 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete
Length
24 ft
3 main spans
Daily traffic
350
2022 count
Owner
County
County Highway Agency

About this bridge

County Highway 37 over Trib.S.Henderson Crk is a concrete culvert carrying County Highway 37 over Trib.S.Henderson Crk in Knox County, Illinois. It was built in 1900, so it is 125 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 350 vehicles a day, roughly 9% of them trucks, projected to reach 429 by 2046. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Highway 37
CrossesTrib.S.Henderson Crk
LocationSE-18-T12NR1E
RouteCounty Highway 0
CountyKnox County
StateIllinois
Coordinates41.02011, -90.42455
Functional classRural Minor Collector

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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2024
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span7 ft (2.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2022)
Projected traffic429 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 County Highway 37 over Trib.S.Henderson Crk built?

It was built in 1900, making it 125 years old in 2025.

What condition is County Highway 37 over Trib.S.Henderson Crk 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 February 2024.

How much traffic does County Highway 37 over Trib.S.Henderson Crk carry?

About 350 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is County Highway 37 over Trib.S.Henderson Crk?

The structure is 24 ft (7.3 m) long with a longest span of 7 ft (2.1 m).

Who owns County Highway 37 over Trib.S.Henderson Crk?

It is owned by the County Highway Agency.