US Bridges

270th Street over Snake Creek

Fair

Charles Mix County, South Dakota · 14W & 6N Platte · Structure no. 000000012090010

Built
1999
26 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
38
2022 count
Owner
County
County Highway Agency

About this bridge

270th Street over Snake Creek is a concrete culvert carrying 270th Street over Snake Creek in Charles Mix County, South Dakota. It was built in 1999, so it is 26 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 38 vehicles a day, roughly 8% of them trucks, projected to reach 49 by 2040. The structure is 21 ft (6.4 m) long and 22 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Carries270th Street
CrossesSnake Creek
Location14W & 6N Platte
RouteCounty Highway 0
Coordinates43.48258, -99.12065
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width22 ft (6.7 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38 (2022)
Projected traffic49 by 2040
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed4.3 mi (7 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 270th Street over Snake Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is 270th Street over Snake Creek 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 September 2023.

How much traffic does 270th Street over Snake Creek carry?

About 38 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is 270th Street over Snake Creek?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 22 ft wide.

Who owns 270th Street over Snake Creek?

It is owned by the County Highway Agency.