US Bridges

Ozark Ext over Rock CR

Fair

Clay County, Missouri · S 15 T 50 N R 33 W · Structure no. 21543

Built
1970
55 years old
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
350
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Ozark Ext over Rock CR is a concrete culvert carrying Ozark Ext over Rock CR in Clay County, Missouri. It was built in 1970, so it is 55 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 350 vehicles a day, roughly 10% of them trucks, projected to reach 560 by 2044. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesOzark Ext
CrossesRock CR
LocationS 15 T 50 N R 33 W
RouteCity Street 311
CountyClay County
StateMissouri
Coordinates39.14965, -94.56456
Functional classUrban 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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadOther
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2024)
Projected traffic560 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Ozark Ext over Rock CR built?

It was built in 1970, making it 55 years old in 2025.

What condition is Ozark Ext 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 December 2023.

How much traffic does Ozark Ext over Rock CR carry?

About 350 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Ozark Ext over Rock CR?

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

Who owns Ozark Ext over Rock CR?

It is owned by the City or Municipal Highway Agency.