US Bridges

Mo 21 S over Cedar CR

Fair

Washington County, Missouri · S 13 T 35 N R 2 E · Structure no. 3586

Built
1987
38 years old
Condition
Fair
inspected October 2023
Type
Tee Beam
Prestressed Concrete Continuous
Length
211 ft
5 main spans
Daily traffic
2,202
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 21 S over Cedar CR is a prestressed concrete continuous tee beam carrying Mo 21 S over Cedar CR in Washington County, Missouri. It was built in 1987, so it is 38 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 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 2,202 vehicles a day, roughly 30% of them trucks, projected to reach 3,303 by 2044. The structure is 211 ft (64.3 m) long and 39 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

Location

Open in Google Maps
CarriesMo 21 S
CrossesCedar CR
LocationS 13 T 35 N R 2 E
RouteState Highway 21
CountyWashington County
StateMissouri
Coordinates37.74514, -90.76822
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.6 US tons
Inventory rating27.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length211 ft (64.3 m)
Longest span43 ft (13 m)
Deck width39 ft (12 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,202 (2024)
Projected traffic3,303 by 2044
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 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 Cedar CR built?

It was built in 1987, making it 38 years old in 2025.

What condition is Mo 21 S over Cedar 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 October 2023.

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

About 2,202 vehicles per day (2024 count), of which roughly 30% are trucks.

How long is Mo 21 S over Cedar CR?

The structure is 211 ft (64.3 m) long with a longest span of 43 ft (13 m) and a deck 39 ft wide.

Who owns Mo 21 S over Cedar CR?

It is owned by the State Highway Agency.