US Bridges

394th Ave. over Sand Ck

Fair

Sanborn County, South Dakota · 3W & 6.9N Woonsocket · Structure no. 000000056000031

Built
1970
55 years old
Condition
Fair
inspected August 2024
Type
Channel Beam
Concrete
Length
36 ft
1 main span
Daily traffic
56
2022 count
Owner
County
County Highway Agency

About this bridge

394th Ave. over Sand Ck is a concrete channel beam carrying 394th Ave. over Sand Ck in Sanborn County, South Dakota. It was built in 1970, so it is 55 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 56 vehicles a day, roughly 2% of them trucks, projected to reach 56 by 2032. The structure is 36 ft (11 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries394th Ave.
CrossesSand Ck
Location3W & 6.9N Woonsocket
RouteCounty Highway 0
Coordinates44.15324, -98.33194
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length36 ft (11 m)
Longest span36 ft (11 m)
Deck width16 ft (4.8 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56 (2022)
Projected traffic56 by 2032
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$25,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 394th Ave. over Sand Ck built?

It was built in 1970, making it 55 years old in 2025.

What condition is 394th Ave. over Sand 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 August 2024.

How much traffic does 394th Ave. over Sand Ck carry?

About 56 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 394th Ave. over Sand Ck?

The structure is 36 ft (11 m) long with a longest span of 36 ft (11 m) and a deck 16 ft wide.

Who owns 394th Ave. over Sand Ck?

It is owned by the County Highway Agency.