US Bridges

Mo 6 E over Grindstone CR

Good

DeKalb County, Missouri · S 24 T 59 N R 30 W · Structure no. 3773

Built
1995
30 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
463 ft
7 main spans
Daily traffic
1,036
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 6 E over Grindstone CR is a prestressed concrete continuous stringer/multi-beam or girder carrying Mo 6 E over Grindstone CR in DeKalb County, Missouri. It was built in 1995, so it is 30 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,036 vehicles a day, roughly 10% of them trucks, projected to reach 1,399 by 2044. The structure is 463 ft (141.1 m) long and 37 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

CarriesMo 6 E
CrossesGrindstone CR
LocationS 24 T 59 N R 30 W
RouteState Highway 6
Coordinates39.90879, -94.21622
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 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 evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.4 US tons
Inventory rating45.6 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length463 ft (141.1 m)
Longest span78 ft (23.8 m)
Deck width37 ft (11.4 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,036 (2024)
Projected traffic1,399 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 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 6 E over Grindstone CR built?

It was built in 1995, making it 30 years old in 2025.

What condition is Mo 6 E over Grindstone CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does Mo 6 E over Grindstone CR carry?

About 1,036 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Mo 6 E over Grindstone CR?

The structure is 463 ft (141.1 m) long with a longest span of 78 ft (23.8 m) and a deck 37 ft wide.

Who owns Mo 6 E over Grindstone CR?

It is owned by the State Highway Agency.