US Bridges

Rt B S over Cobb CR

Fair

Laclede County, Missouri · S 21 T 33 N R 14 W · Structure no. 9481

Built
1931
94 years old
Condition
Fair
inspected August 2023
Type
Culvert
Concrete Continuous
Length
35 ft
4 main spans
Daily traffic
142
2024 count
Owner
State
State Highway Agency

About this bridge

Rt B S over Cobb CR is a concrete continuous culvert carrying Rt B S over Cobb CR in Laclede County, Missouri. It was built in 1931, so it is 94 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 142 vehicles a day, roughly 18% of them trucks, projected to reach 213 by 2044. The structure is 35 ft (10.7 m) long and 22 ft wide. If it were closed, the detour would be 36 mi (58 km).

Location

Open in Google Maps
CarriesRt B S
CrossesCobb CR
LocationS 21 T 33 N R 14 W
RouteState Highway 0B
CountyLaclede County
StateMissouri
Coordinates37.55538, -92.47548
Functional classRural Major 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 protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72.4 US tons
Inventory rating43.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 10
Structure length35 ft (10.7 m)
Longest span8 ft (2.4 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic142 (2024)
Projected traffic213 by 2044
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36 mi (58 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 B S over Cobb CR built?

It was built in 1931, making it 94 years old in 2025.

What condition is Rt B S over Cobb 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 August 2023.

How much traffic does Rt B S over Cobb CR carry?

About 142 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Rt B S over Cobb CR?

The structure is 35 ft (10.7 m) long with a longest span of 8 ft (2.4 m) and a deck 22 ft wide.

Who owns Rt B S over Cobb CR?

It is owned by the State Highway Agency.