US Bridges

6231 over Knob CR

Poor

Bates County, Missouri · S 21 T 41 N R 32 W · Structure no. 34898

Built
2014
11 years old
Condition
Poor
inspected January 2025
Type
Culvert
Concrete Continuous
Length
38 ft
2 main spans
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

6231 over Knob CR is a concrete continuous culvert carrying 6231 over Knob CR in Bates County, Missouri. It was built in 2014, so it is 11 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 39 by 2043. The structure is 38 ft (11.6 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries6231
CrossesKnob CR
LocationS 21 T 41 N R 32 W
RouteCounty Highway 271
CountyBates County
StateMissouri
Coordinates38.34475, -94.46183
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be 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 rating55.6 US tons
Inventory rating33.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic39 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$153,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 6231 over Knob CR built?

It was built in 2014, making it 11 years old in 2025.

What condition is 6231 over Knob CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.

How much traffic does 6231 over Knob CR carry?

About 30 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 6231 over Knob CR?

The structure is 38 ft (11.6 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns 6231 over Knob CR?

It is owned by the County Highway Agency.