US Bridges

Mo 21 S over Old Mines CR

Fair

Washington County, Missouri · S 3039 T 38 N R 2 E · Structure no. 5784

Built
1933
92 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
7,409
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 21 S over Old Mines CR is a concrete continuous culvert carrying Mo 21 S over Old Mines CR in Washington County, Missouri. It was built in 1933, so it is 92 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 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 7,409 vehicles a day, roughly 9% of them trucks, projected to reach 14,077 by 2044. The structure is 28 ft (8.4 m) long and 39 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesMo 21 S
CrossesOld Mines CR
LocationS 3039 T 38 N R 2 E
RouteState Highway 21
CountyWashington County
StateMissouri
Coordinates38.00897, -90.76036
Functional classRural Principal Arterial - Other

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.4 US tons
Inventory rating46.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length28 ft (8.4 m)
Longest span10 ft (3 m)
Deck width39 ft (11.8 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,409 (2024)
Projected traffic14,077 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 Old Mines CR built?

It was built in 1933, making it 92 years old in 2025.

What condition is Mo 21 S over Old Mines 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 June 2024.

How much traffic does Mo 21 S over Old Mines CR carry?

About 7,409 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Mo 21 S over Old Mines CR?

The structure is 28 ft (8.4 m) long with a longest span of 10 ft (3 m) and a deck 39 ft wide.

Who owns Mo 21 S over Old Mines CR?

It is owned by the State Highway Agency.