US Bridges

434 Ave over West Fork Vermillion Rv

Poor

Miner County, South Dakota · 4.3N Howard · Structure no. 000000049160087

Built
1940
85 years old
Condition
Poor
inspected August 2024
Type
Slab
Concrete Continuous
Length
35 ft
2 main spans
Daily traffic
40
2022 count
Owner
County
County Highway Agency

About this bridge

434 Ave over West Fork Vermillion Rv is a concrete continuous slab carrying 434 Ave over West Fork Vermillion Rv in Miner County, South Dakota. It was built in 1940, so it is 85 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.

It carries about 40 vehicles a day, roughly 2% of them trucks, projected to reach 40 by 2032. The structure is 35 ft (10.7 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries434 Ave
CrossesWest Fork Vermillion Rv
Location4.3N Howard
RouteCounty Highway 0
CountyMiner County
StateSouth Dakota
Coordinates44.06923, -97.53066
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span16 ft (4.9 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2022)
Projected traffic40 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$219,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 434 Ave over West Fork Vermillion Rv built?

It was built in 1940, making it 85 years old in 2025.

What condition is 434 Ave over West 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 2024.

How much traffic does 434 Ave over West Fork Vermillion Rv carry?

About 40 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 434 Ave over West Fork Vermillion Rv?

The structure is 35 ft (10.7 m) long with a longest span of 16 ft (4.9 m) and a deck 28 ft wide.

Who owns 434 Ave over West Fork Vermillion Rv?

It is owned by the County Highway Agency.