US Bridges

SD079N over French Ck

Fair

Custer County, South Dakota · 11.5 S JCT Sd 36 W · Structure no. 000000017400131

Built
2003
22 years old
Condition
Fair
inspected March 2021
Type
Slab
Concrete Continuous
Length
119 ft
3 main spans
Daily traffic
2,289
2024 count
Owner
State
State Highway Agency

About this bridge

SD079N over French Ck is a concrete continuous slab carrying SD079N over French Ck in Custer County, South Dakota. It was built in 2003, so it is 22 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 2,289 vehicles a day, roughly 14% of them trucks, projected to reach 3,733 by 2044. The structure is 119 ft (36.3 m) long and 39 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesSD079N
CrossesFrench Ck
Location11.5 S JCT Sd 36 W
RouteState Highway 79
Coordinates43.67991, -103.25927
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating89.3 US tons
Inventory rating53.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length119 ft (36.3 m)
Longest span42 ft (12.8 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,289 (2024)
Projected traffic3,733 by 2044
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 SD079N over French Ck built?

It was built in 2003, making it 22 years old in 2025.

What condition is SD079N over French 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 2021.

How much traffic does SD079N over French Ck carry?

About 2,289 vehicles per day (2024 count), of which roughly 14% are trucks.

How long is SD079N over French Ck?

The structure is 119 ft (36.3 m) long with a longest span of 42 ft (12.8 m) and a deck 39 ft wide.

Who owns SD079N over French Ck?

It is owned by the State Highway Agency.