US Bridges

SD050 over Drainage Ditch

Good

Bon Homme County, South Dakota · 2.5 SE JCT Sd 25 · Structure no. 000000005252154

Built
1955
70 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete Continuous
Length
39 ft
4 main spans
Daily traffic
2,674
2023 count
Owner
State
State Highway Agency

About this bridge

SD050 over Drainage Ditch is a concrete continuous culvert carrying SD050 over Drainage Ditch in Bon Homme County, South Dakota. It was built in 1955, so it is 70 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,674 vehicles a day, roughly 19% of them trucks, projected to reach 3,422 by 2043. The structure is 39 ft (12 m) long. If it were closed, the detour would be 39.1 mi (63 km).

CarriesSD050
CrossesDrainage Ditch
Location2.5 SE JCT Sd 25
RouteState Highway 50
Coordinates42.94657, -97.6682
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.3 US tons
Inventory rating37.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadH 20
Structure length39 ft (12 m)
Longest span10 ft (2.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,674 (2023)
Projected traffic3,422 by 2043
Trucks19%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.1 mi (63 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 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 1955, making it 70 years old in 2025.

What condition is SD050 over Drainage Ditch 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 October 2023.

How much traffic does SD050 over Drainage Ditch carry?

About 2,674 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is SD050 over Drainage Ditch?

The structure is 39 ft (12 m) long with a longest span of 10 ft (2.9 m).

Who owns SD050 over Drainage Ditch?

It is owned by the State Highway Agency.