US Bridges

482 Avenue over Whetstone Rv

Poor

Grant County, South Dakota · 4E & 3.2N Milbank · Structure no. 000000026330038

Built
1978
47 years old
Condition
Poor
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
160 ft
3 main spans
Daily traffic
57
2022 count
Owner
County
County Highway Agency

About this bridge

482 Avenue over Whetstone Rv is a prestressed concrete tee beam carrying 482 Avenue over Whetstone Rv in Grant County, South Dakota. It was built in 1978, so it is 47 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 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 57 vehicles a day, roughly 2% of them trucks, projected to reach 57 by 2032. The structure is 160 ft (48.8 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries482 Avenue
CrossesWhetstone Rv
Location4E & 3.2N Milbank
RouteCounty Highway 0
CountyGrant County
StateSouth Dakota
Coordinates45.27191, -96.55554
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadUnknown
Structure length160 ft (48.8 m)
Longest span60 ft (18.3 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic57 (2022)
Projected traffic57 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$100,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 482 Avenue over Whetstone Rv built?

It was built in 1978, making it 47 years old in 2025.

What condition is 482 Avenue over Whetstone 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 September 2024.

How much traffic does 482 Avenue over Whetstone Rv carry?

About 57 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 482 Avenue over Whetstone Rv?

The structure is 160 ft (48.8 m) long with a longest span of 60 ft (18.3 m) and a deck 31 ft wide.

Who owns 482 Avenue over Whetstone Rv?

It is owned by the County Highway Agency.