US Bridges

County RD 320 over Main Dtch

Fair

Mississippi County, Missouri · S 11 T 26 N R 16 E · Structure no. 14212

Built
1986
39 years old, rebuilt 2002
Condition
Fair
inspected December 2023
Type
Culvert
Steel
Length
51 ft
3 main spans
Daily traffic
15
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 320 over Main Dtch is a steel culvert carrying County RD 320 over Main Dtch in Mississippi County, Missouri. It was built in 1986 and reconstructed in 2002, so it is 39 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 15 vehicles a day, roughly 10% of them trucks, projected to reach 19 by 2044. The structure is 51 ft (15.5 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty RD 320
CrossesMain Dtch
LocationS 11 T 26 N R 16 E
RouteCounty Highway 60
CountyMississippi County
StateMissouri
Coordinates36.9074, -89.28654
Functional classRural Local

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 inspectionDecember 2023
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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadOther
Structure length51 ft (15.5 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2024)
Projected traffic19 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County RD 320 over Main Dtch built?

It was built in 1986, making it 39 years old in 2025. It was reconstructed in 2002.

What condition is County RD 320 over Main Dtch 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 December 2023.

How much traffic does County RD 320 over Main Dtch carry?

About 15 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD 320 over Main Dtch?

The structure is 51 ft (15.5 m) long with a longest span of 16 ft (4.9 m).

Who owns County RD 320 over Main Dtch?

It is owned by the County Highway Agency.