US Bridges

Or 70 E over Grindstone Creek

Good

Boone County, Missouri · S 11 T 48 N R 12 W · Structure no. 33256

Built
2010
15 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
2,326
2024 count
Owner
State
State Highway Agency

About this bridge

Or 70 E over Grindstone Creek is a prestressed concrete box beam or girders - single or spread carrying Or 70 E over Grindstone Creek in Boone County, Missouri. It was built in 2010, so it is 15 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,326 vehicles a day, roughly 4% of them trucks, projected to reach 4,071 by 2044. The structure is 82 ft (25 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesOr 70 E
CrossesGrindstone Creek
LocationS 11 T 48 N R 12 W
RouteState Highway 70
Coordinates38.95969, -92.23622
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating100.2 US tons
Inventory rating54.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length82 ft (25 m)
Longest span80 ft (24.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,326 (2024)
Projected traffic4,071 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 70 E over Grindstone Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is Or 70 E over Grindstone Creek 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 September 2023.

How much traffic does Or 70 E over Grindstone Creek carry?

About 2,326 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Or 70 E over Grindstone Creek?

The structure is 82 ft (25 m) long with a longest span of 80 ft (24.4 m) and a deck 26 ft wide.

Who owns Or 70 E over Grindstone Creek?

It is owned by the State Highway Agency.