US Bridges

US085 over South Fork Grand Rv

Fair

Harding County, South Dakota · 0.2 S JCT Sd 20 W · Structure no. 000000032250257

Built
1963
62 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
255 ft
4 main spans
Daily traffic
1,484
2024 count
Owner
State
State Highway Agency

About this bridge

US085 over South Fork Grand Rv is a steel continuous stringer/multi-beam or girder carrying US085 over South Fork Grand Rv in Harding County, South Dakota. It was built in 1963, so it is 62 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,484 vehicles a day, roughly 25% of them trucks, projected to reach 1,946 by 2044. The structure is 255 ft (77.7 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS085
CrossesSouth Fork Grand Rv
Location0.2 S JCT Sd 20 W
RouteU.S. Route 85
CountyHarding County
StateSouth Dakota
Coordinates45.57786, -103.54586
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length255 ft (77.7 m)
Longest span70 ft (21.3 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,484 (2024)
Projected traffic1,946 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US085 over South Fork Grand Rv built?

It was built in 1963, making it 62 years old in 2025.

What condition is US085 over South Fork Grand Rv in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does US085 over South Fork Grand Rv carry?

About 1,484 vehicles per day (2024 count), of which roughly 25% are trucks.

How long is US085 over South Fork Grand Rv?

The structure is 255 ft (77.7 m) long with a longest span of 70 ft (21.3 m) and a deck 32 ft wide.

Who owns US085 over South Fork Grand Rv?

It is owned by the State Highway Agency.