US Bridges

White Butte Road over Flat Ck

Good

Perkins County, South Dakota · 1 S White Butte · Structure no. 000000053290015

Built
2002
23 years old
Condition
Good
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
163
2022 count
Owner
County
County Highway Agency

About this bridge

White Butte Road over Flat Ck is a prestressed concrete tee beam carrying White Butte Road over Flat Ck in Perkins County, South Dakota. It was built in 2002, so it is 23 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 163 vehicles a day, roughly 3% of them trucks, projected to reach 208 by 2032. The structure is 100 ft (30.5 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesWhite Butte Road
CrossesFlat Ck
Location1 S White Butte
RouteCounty Highway 6399
Coordinates45.927, -102.36276
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating42.8 US tons
Inventory rating33 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length100 ft (30.5 m)
Longest span96 ft (29.3 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic163 (2022)
Projected traffic208 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 White Butte Road over Flat Ck built?

It was built in 2002, making it 23 years old in 2025.

What condition is White Butte Road over Flat 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 May 2023.

How much traffic does White Butte Road over Flat Ck carry?

About 163 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is White Butte Road over Flat Ck?

The structure is 100 ft (30.5 m) long with a longest span of 96 ft (29.3 m) and a deck 32 ft wide.

Who owns White Butte Road over Flat Ck?

It is owned by the County Highway Agency.