US Bridges

Mo 21 S over E Fk Black Rvr

Good

Reynolds County, Missouri · S 16 T 32 N R 2 E · Structure no. 3792

Built
1990
35 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
471 ft
10 main spans
Daily traffic
1,036
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 21 S over E Fk Black Rvr is a prestressed concrete continuous tee beam carrying Mo 21 S over E Fk Black Rvr in Reynolds County, Missouri. It was built in 1990, so it is 35 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,036 vehicles a day, roughly 18% of them trucks, projected to reach 1,554 by 2044. The structure is 471 ft (143.6 m) long and 37 ft wide. If it were closed, the detour would be 46 mi (74 km).

CarriesMo 21 S
CrossesE Fk Black Rvr
LocationS 16 T 32 N R 2 E
RouteState Highway 21
Coordinates37.45066, -90.82814
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.6 US tons
Inventory rating29.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length471 ft (143.6 m)
Longest span48 ft (14.5 m)
Deck width37 ft (11.4 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,036 (2024)
Projected traffic1,554 by 2044
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed46 mi (74 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 E Fk Black Rvr built?

It was built in 1990, making it 35 years old in 2025.

What condition is Mo 21 S over E Fk Black Rvr in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does Mo 21 S over E Fk Black Rvr carry?

About 1,036 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Mo 21 S over E Fk Black Rvr?

The structure is 471 ft (143.6 m) long with a longest span of 48 ft (14.5 m) and a deck 37 ft wide.

Who owns Mo 21 S over E Fk Black Rvr?

It is owned by the State Highway Agency.