US Bridges

SD071 over Plains Ck

Fair

Fall River County, South Dakota · 0.5 N JCT Sd 471 · Structure no. 000000024200253

Built
1991
34 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
239
2024 count
Owner
State
State Highway Agency

About this bridge

SD071 over Plains Ck is a concrete continuous culvert carrying SD071 over Plains Ck in Fall River County, South Dakota. It was built in 1991, so it is 34 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 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 239 vehicles a day, roughly 29% of them trucks, projected to reach 355 by 2044. The structure is 21 ft (6.5 m) long. If it were closed, the detour would be 19.3 mi (31 km).

CarriesSD071
CrossesPlains Ck
Location0.5 N JCT Sd 471
RouteState Highway 71
Coordinates43.11148, -103.66198
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating89.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.5 m)
Longest span10 ft (3.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic239 (2024)
Projected traffic355 by 2044
Trucks29%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SD071 over Plains Ck built?

It was built in 1991, making it 34 years old in 2025.

What condition is SD071 over Plains 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 April 2024.

How much traffic does SD071 over Plains Ck carry?

About 239 vehicles per day (2024 count), of which roughly 29% are trucks.

How long is SD071 over Plains Ck?

The structure is 21 ft (6.5 m) long with a longest span of 10 ft (3.2 m).

Who owns SD071 over Plains Ck?

It is owned by the State Highway Agency.