US Bridges

SD079 over Dry Ck

Fair

Custer County, South Dakota · 8 S JCT Sd 36 W · Structure no. 000000017420106

Built
1957
68 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
38 ft
3 main spans
Daily traffic
1,836
2023 count
Owner
State
State Highway Agency

About this bridge

SD079 over Dry Ck is a concrete continuous culvert carrying SD079 over Dry Ck in Custer County, South Dakota. It was built in 1957, so it is 68 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 1,836 vehicles a day, roughly 18% of them trucks, projected to reach 2,231 by 2043. The structure is 38 ft (11.7 m) long. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSD079
CrossesDry Ck
Location8 S JCT Sd 36 W
RouteState Highway 79
Coordinates43.71464, -103.2188
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating80.7 US tons
Inventory rating48.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 15
Structure length38 ft (11.7 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,836 (2023)
Projected traffic2,231 by 2043
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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 Dry Ck built?

It was built in 1957, making it 68 years old in 2025.

What condition is SD079 over Dry Ck 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 2024.

How much traffic does SD079 over Dry Ck carry?

About 1,836 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is SD079 over Dry Ck?

The structure is 38 ft (11.7 m) long with a longest span of 12 ft (3.7 m).

Who owns SD079 over Dry Ck?

It is owned by the State Highway Agency.