US Bridges

Mo 1 S over Rock CR

Fair

Clay County, Missouri · S 1 T 50 N R 33 W · Structure no. 5792

Built
1936
89 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
5,770
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 1 S over Rock CR is a concrete continuous culvert carrying Mo 1 S over Rock CR in Clay County, Missouri. It was built in 1936, so it is 89 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 5 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 5,770 vehicles a day, roughly 2% of them trucks, projected to reach 9,232 by 2044. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMo 1 S
CrossesRock CR
LocationS 1 T 50 N R 33 W
RouteState Highway 1
CountyClay County
StateMissouri
Coordinates39.16778, -94.55219
Functional classUrban Minor Arterial

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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating23.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length25 ft (7.7 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 traffic5,770 (2024)
Projected traffic9,232 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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 Mo 1 S over Rock CR built?

It was built in 1936, making it 89 years old in 2025.

What condition is Mo 1 S 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 Mo 1 S over Rock CR carry?

About 5,770 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Mo 1 S over Rock CR?

The structure is 25 ft (7.7 m) long with a longest span of 12 ft (3.7 m).

Who owns Mo 1 S over Rock CR?

It is owned by the State Highway Agency.