US Bridges

31260 475th Ave over Ck

Fair

Union County, South Dakota · 2MI E. & 0.5 N. of Spink · Structure no. 000000064050156

Built
2000
25 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
35 ft
1 main span
Daily traffic
97
2022 count
Owner
County
County Highway Agency

About this bridge

31260 475th Ave over Ck is a prestressed concrete tee beam carrying 31260 475th Ave over Ck in Union County, South Dakota. It was built in 2000, so it is 25 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 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 97 vehicles a day, roughly 2% of them trucks, projected to reach 107 by 2032. The structure is 35 ft (10.7 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries31260 475th Ave
CrossesCk
Location2MI E. & 0.5 N. of Spink
RouteCounty Highway 0
CountyUnion County
StateSouth Dakota
Coordinates42.85781, -96.70725
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span34 ft (10.3 m)
Deck width31 ft (9.4 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic97 (2022)
Projected traffic107 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$25,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 31260 475th Ave over Ck built?

It was built in 2000, making it 25 years old in 2025.

What condition is 31260 475th Ave over 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 31260 475th Ave over Ck carry?

About 97 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 31260 475th Ave over Ck?

The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.3 m) and a deck 31 ft wide.

Who owns 31260 475th Ave over Ck?

It is owned by the County Highway Agency.