US Bridges

SD011 Sf over West Union Ck

Good

Union County, South Dakota · 4.0 N JCT Sd 48 · Structure no. 000000064090120

Built
1969
56 years old
Condition
Good
inspected September 2021
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
50
2023 count
Owner
State
State Highway Agency

About this bridge

SD011 Sf over West Union Ck is a concrete continuous culvert carrying SD011 Sf over West Union Ck in Union County, South Dakota. It was built in 1969, so it is 56 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 5% of them trucks, projected to reach 50 by 2043. The structure is 21 ft (6.3 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSD011 Sf
CrossesWest Union Ck
Location4.0 N JCT Sd 48
RouteState Highway 11
Coordinates42.90906, -96.62685
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
Channel and channel protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating83.6 US tons
Inventory rating50 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic50 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 SD011 Sf over West Union Ck built?

It was built in 1969, making it 56 years old in 2025.

What condition is SD011 Sf over West Union 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 September 2021.

How much traffic does SD011 Sf over West Union Ck carry?

About 50 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SD011 Sf over West Union Ck?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m).

Who owns SD011 Sf over West Union Ck?

It is owned by the State Highway Agency.