US Bridges

Mo 21 S over Dorms Br

Fair

Reynolds County, Missouri · S 7 T 32 N R 2 E · Structure no. 5509

Built
1932
93 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
1,036
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 21 S over Dorms Br is a concrete continuous culvert carrying Mo 21 S over Dorms Br in Reynolds County, Missouri. It was built in 1932, so it is 93 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 1,036 vehicles a day, roughly 18% of them trucks, projected to reach 1,554 by 2044. The structure is 29 ft (8.8 m) long and 30 ft wide. If it were closed, the detour would be 46 mi (74 km).

Location

Open in Google Maps
CarriesMo 21 S
CrossesDorms Br
LocationS 7 T 32 N R 2 E
RouteState Highway 21
CountyReynolds County
StateMissouri
Coordinates37.47191, -90.87302
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
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 rating75.4 US tons
Inventory rating44.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length29 ft (8.8 m)
Longest span12 ft (3.7 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 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 Dorms Br built?

It was built in 1932, making it 93 years old in 2025.

What condition is Mo 21 S over Dorms Br 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 Dorms Br carry?

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

How long is Mo 21 S over Dorms Br?

The structure is 29 ft (8.8 m) long with a longest span of 12 ft (3.7 m) and a deck 30 ft wide.

Who owns Mo 21 S over Dorms Br?

It is owned by the State Highway Agency.