US Bridges

SD013 over Big Sioux Rv

Fair

Moody County, South Dakota · 0.3 N of Flandreau · Structure no. 000000051150099

Built
1964
61 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
436 ft
4 main spans
Daily traffic
1,073
2024 count
Owner
State
State Highway Agency

About this bridge

SD013 over Big Sioux Rv is a steel continuous stringer/multi-beam or girder carrying SD013 over Big Sioux Rv in Moody County, South Dakota. It was built in 1964, so it is 61 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 1,073 vehicles a day, roughly 11% of them trucks, projected to reach 1,367 by 2044. The structure is 436 ft (132.9 m) long and 32 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesSD013
CrossesBig Sioux Rv
Location0.3 N of Flandreau
RouteState Highway 13
CountyMoody County
StateSouth Dakota
Coordinates44.05244, -96.5873
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.4 US tons
Inventory rating33.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length436 ft (132.9 m)
Longest span120 ft (36.6 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,073 (2024)
Projected traffic1,367 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 SD013 over Big Sioux Rv built?

It was built in 1964, making it 61 years old in 2025.

What condition is SD013 over Big Sioux 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 December 2023.

How much traffic does SD013 over Big Sioux Rv carry?

About 1,073 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is SD013 over Big Sioux Rv?

The structure is 436 ft (132.9 m) long with a longest span of 120 ft (36.6 m) and a deck 32 ft wide.

Who owns SD013 over Big Sioux Rv?

It is owned by the State Highway Agency.