US Bridges

231 ST over East Fork Vermillion Rv

PoorPosted for load

Lake County, South Dakota · 2.3N & 1.2E Winfred · Structure no. 000000040015110

Built
1930
95 years old
Condition
Poor
inspected August 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
55
2022 count
Owner
County
County Highway Agency

About this bridge

231 ST over East Fork Vermillion Rv is a concrete continuous culvert carrying 231 ST over East Fork Vermillion Rv in Lake County, South Dakota. It was built in 1930, so it is 95 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 55 vehicles a day, roughly 2% of them trucks, projected to reach 55 by 2032. The structure is 21 ft (6.4 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries231 ST
CrossesEast Fork Vermillion Rv
Location2.3N & 1.2E Winfred
RouteCounty Highway 0
CountyLake County
StateSouth Dakota
Coordinates44.03701, -97.33917
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating6 US tons
Inventory rating4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55 (2022)
Projected traffic55 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$300,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 231 ST over East Fork Vermillion Rv built?

It was built in 1930, making it 95 years old in 2025.

What condition is 231 ST over East Fork Vermillion Rv in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does 231 ST over East Fork Vermillion Rv carry?

About 55 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 231 ST over East Fork Vermillion Rv?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 26 ft wide.

Who owns 231 ST over East Fork Vermillion Rv?

It is owned by the County Highway Agency.