US Bridges

SD050 over Drainage Ditch

Fair

Union County, South Dakota · 0.9 W Iowa Line · Structure no. 000000064077223

Built
1960
65 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
1,292
2024 count
Owner
State
State Highway Agency

About this bridge

SD050 over Drainage Ditch is a concrete continuous culvert carrying SD050 over Drainage Ditch in Union County, South Dakota. It was built in 1960, so it is 65 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 1,292 vehicles a day, roughly 20% of them trucks, projected to reach 1,990 by 2044. The structure is 28 ft (8.6 m) long. If it were closed, the detour would be 42.9 mi (69 km).

CarriesSD050
CrossesDrainage Ditch
Location0.9 W Iowa Line
RouteState Highway 50
Coordinates42.76163, -96.65147
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length28 ft (8.6 m)
Longest span14 ft (4.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,292 (2024)
Projected traffic1,990 by 2044
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.9 mi (69 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$12,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SD050 over Drainage Ditch built?

It was built in 1960, making it 65 years old in 2025.

What condition is SD050 over Drainage Ditch 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 SD050 over Drainage Ditch carry?

About 1,292 vehicles per day (2024 count), of which roughly 20% are trucks.

How long is SD050 over Drainage Ditch?

The structure is 28 ft (8.6 m) long with a longest span of 14 ft (4.2 m).

Who owns SD050 over Drainage Ditch?

It is owned by the State Highway Agency.