US Bridges

6th ST over French Ck

Good

Custer County, South Dakota · 6th ST S of Washington ST · Structure no. 000000017230072

Built
1994
31 years old
Condition
Good
inspected August 2023
Type
Slab
Wood or Timber
Length
32 ft
1 main span
Daily traffic
50
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

6th ST over French Ck is a wood or timber slab carrying 6th ST over French Ck in Custer County, South Dakota. It was built in 1994, so it is 31 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 1% of them trucks, projected to reach 75 by 2032. The structure is 32 ft (9.8 m) long and 28 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Carries6th ST
CrossesFrench Ck
Location6th ST S of Washington ST
RouteCity Street 0
Coordinates43.76509, -103.59792
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating66.5 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span31 ft (9.5 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic75 by 2032
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 6th ST over French Ck built?

It was built in 1994, making it 31 years old in 2025.

What condition is 6th ST over French Ck in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does 6th ST over French Ck carry?

About 50 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is 6th ST over French Ck?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.5 m) and a deck 28 ft wide.

Who owns 6th ST over French Ck?

It is owned by the Town or Township Highway Agency.