US Bridges

Rt Dd S over Knobby CR

Fair

Benton County, Missouri · S 36 T 40 N R 20 W · Structure no. 7647

Built
1954
71 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
37 ft
3 main spans
Daily traffic
410
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Dd S over Knobby CR is a concrete continuous culvert carrying Rt Dd S over Knobby CR in Benton County, Missouri. It was built in 1954, so it is 71 years old, older than the Missouri average of 45.1 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 410 vehicles a day, roughly 11% of them trucks, projected to reach 656 by 2044. The structure is 37 ft (11.4 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesRt Dd S
CrossesKnobby CR
LocationS 36 T 40 N R 20 W
RouteState Highway 0DD
CountyBenton County
StateMissouri
Coordinates38.19948, -93.09557
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.6 US tons
Inventory rating29.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 10
Structure length37 ft (11.4 m)
Longest span12 ft (3.7 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic410 (2024)
Projected traffic656 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Rt Dd S over Knobby CR built?

It was built in 1954, making it 71 years old in 2025.

What condition is Rt Dd S over Knobby CR 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 March 2023.

How much traffic does Rt Dd S over Knobby CR carry?

About 410 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Rt Dd S over Knobby CR?

The structure is 37 ft (11.4 m) long with a longest span of 12 ft (3.7 m) and a deck 26 ft wide.

Who owns Rt Dd S over Knobby CR?

It is owned by the State Highway Agency.