233 ST over Ck

Fair

Lake County, South Dakota · 3.6W Madison · Structure no. 000000040094130

Built: 1956; 69 years old
Condition: Fair; inspected August 2023
Type: Slab; Concrete Continuous
Length: 117 ft; 5 main spans
Daily traffic: 400; 2022 count
Owner: County; County Highway Agency

About this bridge

233 ST over Ck is a concrete continuous slab carrying 233 ST over Ck in Lake County, South Dakota. It was built in 1956, so it is 69 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 400 vehicles a day, roughly 2% of them trucks, projected to reach 400 by 2039. The structure is 117 ft (35.7 m) long and 28 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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Carries233 ST

CrossesCk

Location3.6W Madison

RouteCounty Highway 0

CountyLake County

StateSouth Dakota

Coordinates44.00763, -97.1807

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.

Component	Rating	Meaning
Deck	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionAugust 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

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

Waterway adequacy9: Superior to present desirable criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating36 US tons

Inventory rating21.1 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans5

Design loadH 15

Structure length117 ft (35.7 m)

Longest span25 ft (7.6 m)

Deck width28 ft (8.5 m)

Roadway width24 ft (7.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2022)

Projected traffic400 by 2039

Trucks2%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed0.6 mi (1 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$200,000 (2021 estimate)

NavigationNo navigation control on waterway

Frequently asked questions

When was 233 ST over Ck built?

It was built in 1956, making it 69 years old in 2025.

What condition is 233 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 August 2023.

How much traffic does 233 ST over Ck carry?

About 400 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 233 ST over Ck?

The structure is 117 ft (35.7 m) long with a longest span of 25 ft (7.6 m) and a deck 28 ft wide.

Who owns 233 ST over Ck?

It is owned by the County Highway Agency.