US Bridges

SD1806 over Ck

Fair

Stanley County, South Dakota · 3.4 N JCT 14 · Structure no. 000000059387246

Built
1963
62 years old
Condition
Fair
inspected December 2023
Type
Culvert
Steel
Length
32 ft
3 main spans
Daily traffic
1,566
2024 count
Owner
State
State Highway Agency

About this bridge

SD1806 over Ck is a steel culvert carrying SD1806 over Ck in Stanley County, South Dakota. It was built in 1963, so it is 62 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 1,566 vehicles a day, roughly 9% of them trucks, projected to reach 2,264 by 2044. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesSD1806
CrossesCk
Location3.4 N JCT 14
RouteState Highway 1806
CountyStanley County
StateSouth Dakota
Coordinates44.42089, -100.39687
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating110.1 US tons
Inventory rating86 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,566 (2024)
Projected traffic2,264 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SD1806 over Ck built?

It was built in 1963, making it 62 years old in 2025.

What condition is SD1806 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 December 2023.

How much traffic does SD1806 over Ck carry?

About 1,566 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is SD1806 over Ck?

The structure is 32 ft (9.8 m) long with a longest span of 8 ft (2.4 m).

Who owns SD1806 over Ck?

It is owned by the State Highway Agency.