US Bridges

Mo 21 S over Sinking CR

Fair

Reynolds County, Missouri · S 8 T 31 N R 1 E · Structure no. 1757

Built
1968
57 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
1,393
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 21 S over Sinking CR is a concrete continuous culvert carrying Mo 21 S over Sinking CR in Reynolds County, Missouri. It was built in 1968, so it is 57 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 6 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 1,393 vehicles a day, roughly 20% of them trucks, projected to reach 2,090 by 2044. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 42.3 mi (68 km).

Location

Open in Google Maps
CarriesMo 21 S
CrossesSinking CR
LocationS 8 T 31 N R 1 E
RouteState Highway 21
CountyReynolds County
StateMissouri
Coordinates37.3871, -90.96922
Functional classRural Minor Arterial

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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length25 ft (7.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,393 (2024)
Projected traffic2,090 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 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 Mo 21 S over Sinking CR built?

It was built in 1968, making it 57 years old in 2025.

What condition is Mo 21 S 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 November 2024.

How much traffic does Mo 21 S over Sinking CR carry?

About 1,393 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is Mo 21 S over Sinking CR?

The structure is 25 ft (7.7 m) long with a longest span of 10 ft (3 m).

Who owns Mo 21 S over Sinking CR?

It is owned by the State Highway Agency.