US Bridges

243 ST over Ck

Fair

Aurora County, South Dakota · 4.5 W Storla · Structure no. 000000002186050

Built
1924
101 years old, rebuilt 1940
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
34 ft
3 main spans
Daily traffic
101
2022 count
Owner
County
County Highway Agency

About this bridge

243 ST over Ck is a concrete continuous slab carrying 243 ST over Ck in Aurora County, South Dakota. It was built in 1924 and reconstructed in 1940, so it is 101 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 5 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 101 vehicles a day, roughly 3% of them trucks, projected to reach 101 by 2032. The structure is 34 ft (10.4 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Carries243 ST
CrossesCk
Location4.5 W Storla
RouteCounty Highway 0
Coordinates43.86433, -98.44038
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating34.6 US tons
Inventory rating26.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length34 ft (10.4 m)
Longest span11 ft (3.4 m)
Deck width29 ft (8.7 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic101 (2022)
Projected traffic101 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 243 ST over Ck built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 1940.

What condition is 243 ST 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 July 2023.

How much traffic does 243 ST over Ck carry?

About 101 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 243 ST over Ck?

The structure is 34 ft (10.4 m) long with a longest span of 11 ft (3.4 m) and a deck 29 ft wide.

Who owns 243 ST over Ck?

It is owned by the County Highway Agency.