US Bridges

47920 310th ST over West Union Ck

Good

Union County, South Dakota · 8.5S & 0.2E Alcester · Structure no. 000000064092130

Built
2020
5 years old
Condition
Good
inspected August 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
40
2022 count
Owner
County
County Highway Agency

About this bridge

47920 310th ST over West Union Ck is a concrete culvert carrying 47920 310th ST over West Union Ck in Union County, South Dakota. It was built in 2020, so it is 5 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 good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40 vehicles a day, roughly 2% of them trucks, projected to reach 40 by 2032. The structure is 21 ft (6.3 m) long and 23 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries47920 310th ST
CrossesWest Union Ck
Location8.5S & 0.2E Alcester
RouteCounty Highway 0
Coordinates42.89471, -96.62403
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 protection8 Very GoodNo problems noted.
Culvert9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.4 US tons
Inventory rating41 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width23 ft (7 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2022)
Projected traffic40 by 2032
Trucks2%
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

OwnerCounty Highway Agency
Maintained byCounty 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 47920 310th ST over West Union Ck built?

It was built in 2020, making it 5 years old in 2025.

What condition is 47920 310th ST 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 August 2024.

How much traffic does 47920 310th ST over West Union Ck carry?

About 40 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 47920 310th ST over West Union Ck?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 23 ft wide.

Who owns 47920 310th ST over West Union Ck?

It is owned by the County Highway Agency.