US Bridges

SD047 over White Rv

Fair

Lyman County, South Dakota · 7.3 S I 90 Interch · Structure no. 000000043403308

Built
1954
71 years old, rebuilt 2001
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
486 ft
5 main spans
Daily traffic
661
2024 count
Owner
State
State Highway Agency

About this bridge

SD047 over White Rv is a steel continuous stringer/multi-beam or girder carrying SD047 over White Rv in Lyman County, South Dakota. It was built in 1954 and reconstructed in 2001, so it is 71 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 661 vehicles a day, roughly 18% of them trucks, projected to reach 934 by 2044. The structure is 486 ft (148.2 m) long and 35 ft wide. If it were closed, the detour would be 54.1 mi (87 km).

Location

Open in Google Maps
CarriesSD047
CrossesWhite Rv
Location7.3 S I 90 Interch
RouteState Highway 47
CountyLyman County
StateSouth Dakota
Coordinates43.74856, -99.55562
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating51.6 US tons
Inventory rating30.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length486 ft (148.2 m)
Longest span120 ft (36.6 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic661 (2024)
Projected traffic934 by 2044
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed54.1 mi (87 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 SD047 over White Rv built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 2001.

What condition is SD047 over White 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 March 2024.

How much traffic does SD047 over White Rv carry?

About 661 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is SD047 over White Rv?

The structure is 486 ft (148.2 m) long with a longest span of 120 ft (36.6 m) and a deck 35 ft wide.

Who owns SD047 over White Rv?

It is owned by the State Highway Agency.