US Bridges

N Myrtle ST over Rock CR

Fair

Clay County, Missouri · S 30 T 51 N R 32 W · Structure no. 17822

Built
1978
47 years old, rebuilt 2005
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
41 ft
3 main spans
Daily traffic
450
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Myrtle ST over Rock CR is a concrete culvert carrying N Myrtle ST over Rock CR in Clay County, Missouri. It was built in 1978 and reconstructed in 2005, so it is 47 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 450 vehicles a day, roughly 10% of them trucks, projected to reach 720 by 2044. The structure is 41 ft (12.6 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesN Myrtle ST
CrossesRock CR
LocationS 30 T 51 N R 32 W
RouteCity Street 0
CountyClay County
StateMissouri
Coordinates39.19852, -94.53378
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.4 US tons
Inventory rating41.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length41 ft (12.6 m)
Longest span24 ft (7.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2024)
Projected traffic720 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Myrtle ST over Rock CR built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2005.

What condition is N Myrtle ST 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 N Myrtle ST over Rock CR carry?

About 450 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is N Myrtle ST over Rock CR?

The structure is 41 ft (12.6 m) long with a longest span of 24 ft (7.3 m).

Who owns N Myrtle ST over Rock CR?

It is owned by the City or Municipal Highway Agency.