US Bridges

Mo 21 S over West Fork Black Rv

Fair

Reynolds County, Missouri · S 20 T 32 N R 1 E · Structure no. 30479

Built
2004
21 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
766 ft
9 main spans
Daily traffic
1,325
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 21 S over West Fork Black Rv is a prestressed concrete continuous stringer/multi-beam or girder carrying Mo 21 S over West Fork Black Rv in Reynolds County, Missouri. It was built in 2004, so it is 21 years old, younger 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 1,325 vehicles a day, roughly 20% of them trucks, projected to reach 1,988 by 2044. The structure is 766 ft (233.5 m) long and 43 ft wide. If it were closed, the detour would be 28 mi (45 km).

CarriesMo 21 S
CrossesWest Fork Black Rv
LocationS 20 T 32 N R 1 E
RouteState Highway 21
Coordinates37.44539, -90.96241
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.4 US tons
Inventory rating40.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20
Structure length766 ft (233.5 m)
Longest span89 ft (27.1 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,325 (2024)
Projected traffic1,988 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 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 West Fork Black Rv built?

It was built in 2004, making it 21 years old in 2025.

What condition is Mo 21 S over West Fork Black Rv 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 West Fork Black Rv carry?

About 1,325 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is Mo 21 S over West Fork Black Rv?

The structure is 766 ft (233.5 m) long with a longest span of 89 ft (27.1 m) and a deck 43 ft wide.

Who owns Mo 21 S over West Fork Black Rv?

It is owned by the State Highway Agency.