US Bridges

IRR US012 over Grand Rv

Fair

Corson County, South Dakota · 8.2 NW JCT Sd 20 · Structure no. 000000016665200

Built
1960
65 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
556 ft
5 main spans
Daily traffic
636
2024 count
Owner
State
State Highway Agency

About this bridge

IRR US012 over Grand Rv is a steel continuous stringer/multi-beam or girder carrying IRR US012 over Grand Rv in Corson County, South Dakota. It was built in 1960, so it is 65 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 636 vehicles a day, roughly 16% of them trucks, projected to reach 831 by 2044. The structure is 556 ft (169.5 m) long and 32 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesIRR US012
CrossesGrand Rv
Location8.2 NW JCT Sd 20
RouteU.S. Route 12
CountyCorson County
StateSouth Dakota
Coordinates45.65989, -100.63933
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.6 US tons
Inventory rating33.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length556 ft (169.5 m)
Longest span120 ft (36.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic636 (2024)
Projected traffic831 by 2044
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 IRR US012 over Grand Rv built?

It was built in 1960, making it 65 years old in 2025.

What condition is IRR US012 over Grand 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 May 2023.

How much traffic does IRR US012 over Grand Rv carry?

About 636 vehicles per day (2024 count), of which roughly 16% are trucks.

How long is IRR US012 over Grand Rv?

The structure is 556 ft (169.5 m) long with a longest span of 120 ft (36.6 m) and a deck 32 ft wide.

Who owns IRR US012 over Grand Rv?

It is owned by the State Highway Agency.