US Bridges

Plattsburg RD over Rock CR

Fair

Clay County, Missouri · S 32 T 53 N R 31 W · Structure no. 16781

Built
1950
75 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
1,417
2024 count
Owner
County
County Highway Agency

About this bridge

Plattsburg RD over Rock CR is a concrete continuous culvert carrying Plattsburg RD over Rock CR in Clay County, Missouri. It was built in 1950, so it is 75 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 1,417 vehicles a day, roughly 10% of them trucks, projected to reach 2,196 by 2044. The structure is 25 ft (7.6 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesPlattsburg RD
CrossesRock CR
LocationS 32 T 53 N R 31 W
RouteCounty Highway 132
CountyClay County
StateMissouri
Coordinates39.35996, -94.41165
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadOther
Structure length25 ft (7.6 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 traffic1,417 (2024)
Projected traffic2,196 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Plattsburg RD over Rock CR built?

It was built in 1950, making it 75 years old in 2025.

What condition is Plattsburg RD over Rock 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 January 2024.

How much traffic does Plattsburg RD over Rock CR carry?

About 1,417 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Plattsburg RD over Rock CR?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 30 ft wide.

Who owns Plattsburg RD over Rock CR?

It is owned by the County Highway Agency.