US Bridges

SD015 over South Fork Whetstone Rv

Fair

Grant County, South Dakota · 0.7 N JCT US 12 · Structure no. 000000026290068

Built
1982
43 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
106 ft
3 main spans
Daily traffic
1,910
2024 count
Owner
State
State Highway Agency

About this bridge

SD015 over South Fork Whetstone Rv is a concrete continuous slab carrying SD015 over South Fork Whetstone Rv in Grant County, South Dakota. It was built in 1982, so it is 43 years old, younger than the South Dakota average of 48.9 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 1,910 vehicles a day, roughly 14% of them trucks, projected to reach 2,609 by 2044. The structure is 106 ft (32.4 m) long and 49 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesSD015
CrossesSouth Fork Whetstone Rv
Location0.7 N JCT US 12
RouteState Highway 15
Coordinates45.22871, -96.64081
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.7 US tons
Inventory rating53.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length106 ft (32.4 m)
Longest span38 ft (11.5 m)
Deck width49 ft (14.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,910 (2024)
Projected traffic2,609 by 2044
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 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 SD015 over South Fork Whetstone Rv built?

It was built in 1982, making it 43 years old in 2025.

What condition is SD015 over South Fork Whetstone Rv 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 2024.

How much traffic does SD015 over South Fork Whetstone Rv carry?

About 1,910 vehicles per day (2024 count), of which roughly 14% are trucks.

How long is SD015 over South Fork Whetstone Rv?

The structure is 106 ft (32.4 m) long with a longest span of 38 ft (11.5 m) and a deck 49 ft wide.

Who owns SD015 over South Fork Whetstone Rv?

It is owned by the State Highway Agency.