US Bridges

US012 over Whetstone Rv Div Channel

Fair

Grant County, South Dakota · 0.6 E JCT Sd 109 · Structure no. 000000026379024

Built
1955
70 years old, rebuilt 1977
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
390 ft
6 main spans
Daily traffic
3,765
2024 count
Owner
State
State Highway Agency

About this bridge

US012 over Whetstone Rv Div Channel is a steel stringer/multi-beam or girder carrying US012 over Whetstone Rv Div Channel in Grant County, South Dakota. It was built in 1955 and reconstructed in 1977, so it is 70 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 fair condition with a lowest component rating of 5 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 3,765 vehicles a day, roughly 22% of them trucks, projected to reach 5,143 by 2044. The structure is 390 ft (118.8 m) long and 38 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesUS012
CrossesWhetstone Rv Div Channel
Location0.6 E JCT Sd 109
RouteU.S. Route 12
CountyGrant County
StateSouth Dakota
Coordinates45.29153, -96.45454
Functional classRural Principal Arterial - Other

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating85.8 US tons
Inventory rating51.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadH 20
Structure length390 ft (118.8 m)
Longest span69 ft (20.9 m)
Deck width38 ft (11.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,765 (2024)
Projected traffic5,143 by 2044
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemYes

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 US012 over Whetstone Rv Div Channel built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1977.

What condition is US012 over Whetstone Rv Div Channel 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 March 2023.

How much traffic does US012 over Whetstone Rv Div Channel carry?

About 3,765 vehicles per day (2024 count), of which roughly 22% are trucks.

How long is US012 over Whetstone Rv Div Channel?

The structure is 390 ft (118.8 m) long with a longest span of 69 ft (20.9 m) and a deck 38 ft wide.

Who owns US012 over Whetstone Rv Div Channel?

It is owned by the State Highway Agency.