US Bridges

Thunderhead Falls over Rapid Ck

Good

Pennington County, South Dakota · 0.8E 1.8S Johnson Sd · Structure no. 000000052316316

Built
2024
1 years old
Condition
Good
inspected June 2024
Type
Frame
Concrete
Length
44 ft
1 main span
Daily traffic
62
2022 count
Owner
County
County Highway Agency

About this bridge

Thunderhead Falls over Rapid Ck is a concrete frame carrying Thunderhead Falls over Rapid Ck in Pennington County, South Dakota. It was built in 2024, so it is 1 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 62 vehicles a day, roughly 2% of them trucks, projected to reach 62 by 2032. The structure is 44 ft (13.4 m) long and 26 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesThunderhead Falls
CrossesRapid Ck
Location0.8E 1.8S Johnson Sd
RouteCounty Highway 0
Coordinates44.05821, -103.4194
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating53 US tons
Inventory rating41 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width26 ft (7.8 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62 (2022)
Projected traffic62 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Thunderhead Falls over Rapid Ck built?

It was built in 2024, making it 1 years old in 2025.

What condition is Thunderhead Falls over Rapid 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 June 2024.

How much traffic does Thunderhead Falls over Rapid Ck carry?

About 62 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Thunderhead Falls over Rapid Ck?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 26 ft wide.

Who owns Thunderhead Falls over Rapid Ck?

It is owned by the County Highway Agency.