US Bridges

Thunder Butte Road over Thunder Butte Ck

Fair

Ziebach County, South Dakota · 12 N 5 W Dupree · Structure no. 000000069150171

Built
1969
56 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
184 ft
3 main spans
Daily traffic
143
2022 count
Owner
County
County Highway Agency

About this bridge

Thunder Butte Road over Thunder Butte Ck is a steel stringer/multi-beam or girder carrying Thunder Butte Road over Thunder Butte Ck in Ziebach County, South Dakota. It was built in 1969, so it is 56 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 143 vehicles a day, roughly 2% of them trucks, projected to reach 143 by 2032. The structure is 184 ft (56.1 m) long and 30 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesThunder Butte Road
CrossesThunder Butte Ck
Location12 N 5 W Dupree
RouteCounty Highway 0
CountyZiebach County
StateSouth Dakota
Coordinates45.22534, -101.70926
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating56.1 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length184 ft (56.1 m)
Longest span70 ft (21.3 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic143 (2022)
Projected traffic143 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Thunder Butte Road over Thunder Butte Ck built?

It was built in 1969, making it 56 years old in 2025.

What condition is Thunder Butte Road over Thunder Butte 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 July 2024.

How much traffic does Thunder Butte Road over Thunder Butte Ck carry?

About 143 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Thunder Butte Road over Thunder Butte Ck?

The structure is 184 ft (56.1 m) long with a longest span of 70 ft (21.3 m) and a deck 30 ft wide.

Who owns Thunder Butte Road over Thunder Butte Ck?

It is owned by the County Highway Agency.