US Bridges

SD079 over Spring Ck

Fair

Pennington County, South Dakota · 6.6 N Custer CO Line · Structure no. 000000052436393

Built
1997
28 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete Continuous
Length
159 ft
4 main spans
Daily traffic
8,824
2024 count
Owner
State
State Highway Agency

About this bridge

SD079 over Spring Ck is a concrete continuous slab carrying SD079 over Spring Ck in Pennington County, South Dakota. It was built in 1997, so it is 28 years old, younger 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 8,824 vehicles a day, roughly 13% of them trucks, projected to reach 13,915 by 2044. The structure is 159 ft (48.6 m) long and 87 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

CarriesSD079
CrossesSpring Ck
Location6.6 N Custer CO Line
RouteState Highway 79
Coordinates43.95107, -103.18755
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating82.3 US tons
Inventory rating49.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length159 ft (48.6 m)
Longest span41 ft (12.4 m)
Deck width87 ft (26.4 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,824 (2024)
Projected traffic13,915 by 2044
Trucks13%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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 Spring Ck built?

It was built in 1997, making it 28 years old in 2025.

What condition is SD079 over Spring 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 March 2024.

How much traffic does SD079 over Spring Ck carry?

About 8,824 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is SD079 over Spring Ck?

The structure is 159 ft (48.6 m) long with a longest span of 41 ft (12.4 m) and a deck 87 ft wide.

Who owns SD079 over Spring Ck?

It is owned by the State Highway Agency.