US Bridges

SD079 over Moreau Rv

Fair

Harding County, South Dakota · 21.4 S JCT Sd 20 · Structure no. 000000032423471

Built
1964
61 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
138 ft
3 main spans
Daily traffic
356
2024 count
Owner
State
State Highway Agency

About this bridge

SD079 over Moreau Rv is a steel stringer/multi-beam or girder carrying SD079 over Moreau Rv in Harding 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 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 356 vehicles a day, roughly 19% of them trucks, projected to reach 467 by 2044. The structure is 138 ft (42.2 m) long and 32 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesSD079
CrossesMoreau Rv
Location21.4 S JCT Sd 20
RouteState Highway 79
CountyHarding County
StateSouth Dakota
Coordinates45.26979, -103.19689
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.3 US tons
Inventory rating49.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length138 ft (42.2 m)
Longest span52 ft (15.9 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic356 (2024)
Projected traffic467 by 2044
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 SD079 over Moreau Rv built?

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

What condition is SD079 over Moreau 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 July 2023.

How much traffic does SD079 over Moreau Rv carry?

About 356 vehicles per day (2024 count), of which roughly 19% are trucks.

How long is SD079 over Moreau Rv?

The structure is 138 ft (42.2 m) long with a longest span of 52 ft (15.9 m) and a deck 32 ft wide.

Who owns SD079 over Moreau Rv?

It is owned by the State Highway Agency.