US Bridges

Mo 78 E over Rock CR

Fair

Jackson County, Missouri · S 9 T 49 N R 32 W · Structure no. 1206

Built
1965
60 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
47 ft
3 main spans
Daily traffic
22,267
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 78 E over Rock CR is a concrete continuous culvert carrying Mo 78 E over Rock CR in Jackson County, Missouri. It was built in 1965, so it is 60 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 22,267 vehicles a day, roughly 5% of them trucks, projected to reach 30,060 by 2044. The structure is 47 ft (14.2 m) long. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesMo 78 E
CrossesRock CR
LocationS 9 T 49 N R 32 W
RouteState Highway 78
CountyJackson County
StateMissouri
Coordinates39.08071, -94.45442
Functional classUrban Other Principal 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 protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 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 rating105.2 US tons
Inventory rating63.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length47 ft (14.2 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,267 (2024)
Projected traffic30,060 by 2044
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 Mo 78 E over Rock CR built?

It was built in 1965, making it 60 years old in 2025.

What condition is Mo 78 E 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 2023.

How much traffic does Mo 78 E over Rock CR carry?

About 22,267 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Mo 78 E over Rock CR?

The structure is 47 ft (14.2 m) long with a longest span of 15 ft (4.6 m).

Who owns Mo 78 E over Rock CR?

It is owned by the State Highway Agency.