US Bridges

10 Mile Road over Grindstone Ck

Good

Haakon County, South Dakota · 3.3 W & 10 N Philip · Structure no. 000000028137390

Built
1965
60 years old
Condition
Good
inspected September 2024
Type
Slab
Concrete Continuous
Length
92 ft
4 main spans
Daily traffic
80
2022 count
Owner
County
County Highway Agency

About this bridge

10 Mile Road over Grindstone Ck is a concrete continuous slab carrying 10 Mile Road over Grindstone Ck in Haakon County, South Dakota. It was built in 1965, so it is 60 years old, older than the South Dakota average of 48.9 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 80 vehicles a day, roughly 2% of them trucks, projected to reach 80 by 2032. The structure is 92 ft (28 m) long and 28 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Carries10 Mile Road
CrossesGrindstone Ck
Location3.3 W & 10 N Philip
RouteCounty Highway 0
Coordinates44.18281, -101.73312
Functional classRural Local

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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.3 US tons
Inventory rating25.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length92 ft (28 m)
Longest span25 ft (7.6 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2022)
Projected traffic80 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$2,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 10 Mile Road over Grindstone Ck built?

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

What condition is 10 Mile Road over Grindstone Ck 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 2024.

How much traffic does 10 Mile Road over Grindstone Ck carry?

About 80 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 10 Mile Road over Grindstone Ck?

The structure is 92 ft (28 m) long with a longest span of 25 ft (7.6 m) and a deck 28 ft wide.

Who owns 10 Mile Road over Grindstone Ck?

It is owned by the County Highway Agency.