US Bridges

438th Avenue over W. Fork of Vermillion Rv

Good

McCook County, South Dakota · 0.5N of Unityville · Structure no. 000000044080025

Built
2019
6 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
21
2022 count
Owner
County
County Highway Agency

About this bridge

438th Avenue over W. Fork of Vermillion Rv is a steel stringer/multi-beam or girder carrying 438th Avenue over W. Fork of Vermillion Rv in McCook County, South Dakota. It was built in 2019, so it is 6 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 21 vehicles a day, roughly 2% of them trucks, projected to reach 21 by 2032. The structure is 60 ft (18.3 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries438th Avenue
CrossesW. Fork of Vermillion Rv
Location0.5N of Unityville
RouteCounty Highway 0
Coordinates43.81183, -97.44895
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.9 US tons
Inventory rating33.1 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length60 ft (18.3 m)
Longest span56 ft (17.1 m)
Deck width33 ft (10.1 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21 (2022)
Projected traffic21 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 438th Avenue over W. Fork of Vermillion Rv built?

It was built in 2019, making it 6 years old in 2025.

What condition is 438th Avenue over W. Fork of Vermillion Rv in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does 438th Avenue over W. Fork of Vermillion Rv carry?

About 21 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 438th Avenue over W. Fork of Vermillion Rv?

The structure is 60 ft (18.3 m) long with a longest span of 56 ft (17.1 m) and a deck 33 ft wide.

Who owns 438th Avenue over W. Fork of Vermillion Rv?

It is owned by the County Highway Agency.