US Bridges

Mo 12 E over Rock CR

Fair

Jackson County, Missouri · S 5 T 49 N R 32 W · Structure no. 4185

Built
1996
29 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
290 ft
4 main spans
Daily traffic
9,811
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 12 E over Rock CR is a prestressed concrete continuous stringer/multi-beam or girder carrying Mo 12 E over Rock CR in Jackson County, Missouri. It was built in 1996, so it is 29 years old, younger 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 9,811 vehicles a day, roughly 11% of them trucks, projected to reach 13,245 by 2044. The structure is 290 ft (88.4 m) long and 70 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMo 12 E
CrossesRock CR
LocationS 5 T 49 N R 32 W
RouteState Highway 12
CountyJackson County
StateMissouri
Coordinates39.09417, -94.46999
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 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
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating67.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length290 ft (88.4 m)
Longest span73 ft (22.2 m)
Deck width70 ft (21.2 m)
Roadway width67 ft (20.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,811 (2024)
Projected traffic13,245 by 2044
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 12 E over Rock CR built?

It was built in 1996, making it 29 years old in 2025.

What condition is Mo 12 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 September 2023.

How much traffic does Mo 12 E over Rock CR carry?

About 9,811 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Mo 12 E over Rock CR?

The structure is 290 ft (88.4 m) long with a longest span of 73 ft (22.2 m) and a deck 70 ft wide.

Who owns Mo 12 E over Rock CR?

It is owned by the State Highway Agency.