US Bridges

County RD 21 over Beaver Ck

Good

Fall River County, South Dakota · 1.1W & 0.3S Burdock · Structure no. 000000024020020

Built
2022
3 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
150 ft
2 main spans
Daily traffic
41
2022 count
Owner
County
County Highway Agency

About this bridge

County RD 21 over Beaver Ck is a prestressed concrete stringer/multi-beam or girder carrying County RD 21 over Beaver Ck in Fall River County, South Dakota. It was built in 2022, so it is 3 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 41 vehicles a day, roughly 2% of them trucks, projected to reach 41 by 2032. The structure is 150 ft (45.7 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesCounty RD 21
CrossesBeaver Ck
Location1.1W & 0.3S Burdock
RouteCounty Highway 0
Coordinates43.44914, -104.01588
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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.2 US tons
Inventory rating45.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length150 ft (45.7 m)
Longest span74 ft (22.6 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41 (2022)
Projected traffic41 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 County RD 21 over Beaver Ck built?

It was built in 2022, making it 3 years old in 2025.

What condition is County RD 21 over Beaver 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 2024.

How much traffic does County RD 21 over Beaver Ck carry?

About 41 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County RD 21 over Beaver Ck?

The structure is 150 ft (45.7 m) long with a longest span of 74 ft (22.6 m) and a deck 31 ft wide.

Who owns County RD 21 over Beaver Ck?

It is owned by the County Highway Agency.