US Bridges

US016 over French Ck

Fair

Custer County, South Dakota · 0.1 E JCT US 385 S · Structure no. 000000017226073

Built
1966
59 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
67 ft
3 main spans
Daily traffic
10,052
2024 count
Owner
State
State Highway Agency

About this bridge

US016 over French Ck is a concrete continuous slab carrying US016 over French Ck in Custer County, South Dakota. It was built in 1966, so it is 59 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 10,052 vehicles a day, roughly 4% of them trucks, projected to reach 16,395 by 2044. The structure is 67 ft (20.5 m) long and 64 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

CarriesUS016
CrossesFrench Ck
Location0.1 E JCT US 385 S
RouteU.S. Route 16
Coordinates43.76385, -103.60917
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating37.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length67 ft (20.5 m)
Longest span24 ft (7.3 m)
Deck width64 ft (19.6 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,052 (2024)
Projected traffic16,395 by 2044
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed29.8 mi (48 km)
TollOn a free road
National Highway SystemYes

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 US016 over French Ck built?

It was built in 1966, making it 59 years old in 2025.

What condition is US016 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 January 2025.

How much traffic does US016 over French Ck carry?

About 10,052 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is US016 over French Ck?

The structure is 67 ft (20.5 m) long with a longest span of 24 ft (7.3 m) and a deck 64 ft wide.

Who owns US016 over French Ck?

It is owned by the State Highway Agency.