US Bridges

County RD 258 over Sinking CR

Fair

Shannon County, Missouri · S 28 T 31 N R 4 W · Structure no. 13348

Built
1978
47 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
100 ft
24 main spans
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 258 over Sinking CR is a concrete continuous slab carrying County RD 258 over Sinking CR in Shannon County, Missouri. It was built in 1978, so it is 47 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 60 by 2043. The structure is 100 ft (30.5 m) long and 14 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesCounty RD 258
CrossesSinking CR
LocationS 28 T 31 N R 4 W
RouteCounty Highway 36
CountyShannon County
StateMissouri
Coordinates37.3537, -91.3828
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
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 geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating34.7 US tons
Inventory rating23.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans24
Design loadOther
Structure length100 ft (30.5 m)
Longest span4 ft (1.2 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic60 by 2043
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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 RD 258 over Sinking CR built?

It was built in 1978, making it 47 years old in 2025.

What condition is County RD 258 over Sinking 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 January 2025.

How much traffic does County RD 258 over Sinking CR carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 258 over Sinking CR?

The structure is 100 ft (30.5 m) long with a longest span of 4 ft (1.2 m) and a deck 14 ft wide.

Who owns County RD 258 over Sinking CR?

It is owned by the County Highway Agency.