US Bridges

481 Avenue over South Fork Whetstone Rv

Good

Grant County, South Dakota · 2.5E & 1.8N Milbank · Structure no. 000000026320053

Built
2021
4 years old
Condition
Good
inspected September 2022
Type
Culvert
Concrete Continuous
Length
53 ft
3 main spans
Daily traffic
49
2022 count
Owner
County
County Highway Agency

About this bridge

481 Avenue over South Fork Whetstone Rv is a concrete continuous culvert carrying 481 Avenue over South Fork Whetstone Rv in Grant County, South Dakota. It was built in 2021, so it is 4 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 49 vehicles a day, roughly 2% of them trucks, projected to reach 49 by 2040. The structure is 53 ft (16.2 m) long and 26 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Carries481 Avenue
CrossesSouth Fork Whetstone Rv
Location2.5E & 1.8N Milbank
RouteCounty Highway 0
Coordinates45.25092, -96.57601
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating41 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHL 93
Structure length53 ft (16.2 m)
Longest span14 ft (4.4 m)
Deck width26 ft (7.9 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49 (2022)
Projected traffic49 by 2040
Trucks2%
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 481 Avenue over South Fork Whetstone Rv built?

It was built in 2021, making it 4 years old in 2025.

What condition is 481 Avenue over South Fork Whetstone 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 September 2022.

How much traffic does 481 Avenue over South Fork Whetstone Rv carry?

About 49 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 481 Avenue over South Fork Whetstone Rv?

The structure is 53 ft (16.2 m) long with a longest span of 14 ft (4.4 m) and a deck 26 ft wide.

Who owns 481 Avenue over South Fork Whetstone Rv?

It is owned by the County Highway Agency.