US Bridges

SD073 over West Plum Ck

Fair

Haakon County, South Dakota · 2.8 S JCT Sd 34 · Structure no. 000000028160269

Built
1990
35 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
700
2024 count
Owner
State
State Highway Agency

About this bridge

SD073 over West Plum Ck is a concrete continuous culvert carrying SD073 over West Plum Ck in Haakon County, South Dakota. It was built in 1990, so it is 35 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 5 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 700 vehicles a day, roughly 35% of them trucks, projected to reach 995 by 2044. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 52.2 mi (84 km).

CarriesSD073
CrossesWest Plum Ck
Location2.8 S JCT Sd 34
RouteState Highway 73
Coordinates44.3597, -101.67884
Functional classRural Principal Arterial - Other

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.1 US tons
Inventory rating45 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length25 ft (7.7 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2024)
Projected traffic995 by 2044
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.2 mi (84 km)
TollOn a free road
National Highway SystemYes

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 SD073 over West Plum Ck built?

It was built in 1990, making it 35 years old in 2025.

What condition is SD073 over West Plum 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 June 2023.

How much traffic does SD073 over West Plum Ck carry?

About 700 vehicles per day (2024 count), of which roughly 35% are trucks.

How long is SD073 over West Plum Ck?

The structure is 25 ft (7.7 m) long with a longest span of 12 ft (3.7 m).

Who owns SD073 over West Plum Ck?

It is owned by the State Highway Agency.