US Bridges

Rp IS35S to IS29N over Rock CR

Fair

Clay County, Missouri · S 1 T 50 N R 33 W · Structure no. 1456

Built
1967
58 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
32 ft
2 main spans
Daily traffic
18,167
2024 count
Owner
State
State Highway Agency

About this bridge

Rp IS35S to IS29N over Rock CR is a concrete continuous culvert carrying Rp IS35S to IS29N over Rock CR in Clay County, Missouri. It was built in 1967, so it is 58 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 18,167 vehicles a day, roughly 9% of them trucks, projected to reach 32,701 by 2044. The structure is 32 ft (9.9 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesRp IS35S to IS29N
CrossesRock CR
LocationS 1 T 50 N R 33 W
RouteState Highway 0
CountyClay County
StateMissouri
Coordinates39.17227, -94.55765
Functional classUrban Principal Arterial - Interstate

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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length32 ft (9.9 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,167 (2024)
Projected traffic32,701 by 2044
Trucks9%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Rp IS35S to IS29N over Rock CR built?

It was built in 1967, making it 58 years old in 2025.

What condition is Rp IS35S to IS29N 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 November 2024.

How much traffic does Rp IS35S to IS29N over Rock CR carry?

About 18,167 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Rp IS35S to IS29N over Rock CR?

The structure is 32 ft (9.9 m) long with a longest span of 11 ft (3.4 m).

Who owns Rp IS35S to IS29N over Rock CR?

It is owned by the State Highway Agency.