US Bridges

IRR SD063 over Grand Rv

Fair

Corson County, South Dakota · 11.3 S of Mclaughlin · Structure no. 000000016578202

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
504 ft
4 main spans
Daily traffic
220
2024 count
Owner
State
State Highway Agency

About this bridge

IRR SD063 over Grand Rv is a steel continuous stringer/multi-beam or girder carrying IRR SD063 over Grand Rv in Corson County, South Dakota. It was built in 1970, so it is 55 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 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 220 vehicles a day, roughly 23% of them trucks, projected to reach 287 by 2044. The structure is 504 ft (153.6 m) long and 35 ft wide. If it were closed, the detour would be 75.2 mi (121 km).

Location

Open in Google Maps
CarriesIRR SD063
CrossesGrand Rv
Location11.3 S of Mclaughlin
RouteState Highway 63
CountyCorson County
StateSouth Dakota
Coordinates45.65845, -100.81777
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.3 US tons
Inventory rating28.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length504 ft (153.6 m)
Longest span140 ft (42.7 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic220 (2024)
Projected traffic287 by 2044
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed75.2 mi (121 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$55,000
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR SD063 over Grand Rv built?

It was built in 1970, making it 55 years old in 2025.

What condition is IRR SD063 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 SD063 over Grand Rv carry?

About 220 vehicles per day (2024 count), of which roughly 23% are trucks.

How long is IRR SD063 over Grand Rv?

The structure is 504 ft (153.6 m) long with a longest span of 140 ft (42.7 m) and a deck 35 ft wide.

Who owns IRR SD063 over Grand Rv?

It is owned by the State Highway Agency.