US Bridges

County Road 320 over Drain Dtch

PoorPosted for load

Carroll County, Missouri · S 25 T 52 N R 25 W · Structure no. 24475

Built
1975
50 years old
Condition
Poor
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
26 ft
1 main span
Daily traffic
40
2024 count
Owner
County
County Highway Agency

About this bridge

County Road 320 over Drain Dtch is a steel stringer/multi-beam or girder carrying County Road 320 over Drain Dtch in Carroll County, Missouri. It was built in 1975, so it is 50 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 40 vehicles a day, roughly 10% of them trucks, projected to reach 44 by 2044. The structure is 26 ft (7.9 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCounty Road 320
CrossesDrain Dtch
LocationS 25 T 52 N R 25 W
RouteCounty Highway 498
Coordinates39.29272, -93.66382
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating18.8 US tons
Inventory rating9.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length26 ft (7.9 m)
Longest span26 ft (7.9 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2024)
Projected traffic44 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$255,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 320 over Drain Dtch built?

It was built in 1975, making it 50 years old in 2025.

What condition is County Road 320 over Drain Dtch in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2023.

How much traffic does County Road 320 over Drain Dtch carry?

About 40 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County Road 320 over Drain Dtch?

The structure is 26 ft (7.9 m) long with a longest span of 26 ft (7.9 m) and a deck 24 ft wide.

Who owns County Road 320 over Drain Dtch?

It is owned by the County Highway Agency.