US Bridges

59th Terrace over Rock CR

Fair

Clay County, Missouri · S 30 T 51 N R 32 W · Structure no. 17818

Built
1960
65 years old
Condition
Fair
inspected December 2023
Type
Culvert
Steel
Length
26 ft
2 main spans
Daily traffic
500
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

59th Terrace over Rock CR is a steel culvert carrying 59th Terrace over Rock CR in Clay County, Missouri. It was built in 1960, so it is 65 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 500 vehicles a day, roughly 10% of them trucks, projected to reach 800 by 2044. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries59th Terrace
CrossesRock CR
LocationS 30 T 51 N R 32 W
RouteCity Street 0
CountyClay County
StateMissouri
Coordinates39.20271, -94.54068
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 above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadOther
Structure length26 ft (7.9 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 traffic500 (2024)
Projected traffic800 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

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 59th Terrace over Rock CR built?

It was built in 1960, making it 65 years old in 2025.

What condition is 59th Terrace 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 59th Terrace over Rock CR carry?

About 500 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is 59th Terrace over Rock CR?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m).

Who owns 59th Terrace over Rock CR?

It is owned by the City or Municipal Highway Agency.