US Bridges

N Antioch RD over Rock CR

Good

Clay County, Missouri · S 7 T 50 N R 32 W · Structure no. 25316

Built
1997
28 years old
Condition
Good
inspected April 2024
Type
Culvert
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
3,549
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Antioch RD over Rock CR is a concrete continuous culvert carrying N Antioch RD over Rock CR in Clay County, Missouri. It was built in 1997, so it is 28 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,549 vehicles a day, roughly 8% of them trucks, projected to reach 5,678 by 2044. The structure is 33 ft (10.1 m) long and 27 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesN Antioch RD
CrossesRock CR
LocationS 7 T 50 N R 32 W
RouteCity Street 0
Coordinates39.15609, -94.54739
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span15 ft (4.6 m)
Deck width27 ft (8.1 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,549 (2024)
Projected traffic5,678 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 N Antioch RD over Rock CR built?

It was built in 1997, making it 28 years old in 2025.

What condition is N Antioch RD over Rock CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does N Antioch RD over Rock CR carry?

About 3,549 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is N Antioch RD over Rock CR?

The structure is 33 ft (10.1 m) long with a longest span of 15 ft (4.6 m) and a deck 27 ft wide.

Who owns N Antioch RD over Rock CR?

It is owned by the City or Municipal Highway Agency.