US Bridges

US085 over Belle Fourche Rv

Fair

Butte County, South Dakota · 0.4 S JCT US 212 · Structure no. 000000010098371

Built
1958
67 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
583 ft
7 main spans
Daily traffic
10,476
2024 count
Owner
State
State Highway Agency

About this bridge

US085 over Belle Fourche Rv is a steel continuous stringer/multi-beam or girder carrying US085 over Belle Fourche Rv in Butte County, South Dakota. It was built in 1958, so it is 67 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 5 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 10,476 vehicles a day, roughly 7% of them trucks, projected to reach 15,033 by 2044. The structure is 583 ft (177.8 m) long and 64 ft wide. If it were closed, the detour would be 69 mi (111 km).

Location

Open in Google Maps
CarriesUS085
CrossesBelle Fourche Rv
Location0.4 S JCT US 212
RouteU.S. Route 85
CountyButte County
StateSouth Dakota
Coordinates44.67631, -103.85365
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40.5 US tons
Inventory rating24.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadH 20
Structure length583 ft (177.8 m)
Longest span140 ft (42.7 m)
Deck width64 ft (19.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,476 (2024)
Projected traffic15,033 by 2044
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed69 mi (111 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 Belle Fourche Rv built?

It was built in 1958, making it 67 years old in 2025.

What condition is US085 over Belle Fourche 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 June 2024.

How much traffic does US085 over Belle Fourche Rv carry?

About 10,476 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is US085 over Belle Fourche Rv?

The structure is 583 ft (177.8 m) long with a longest span of 140 ft (42.7 m) and a deck 64 ft wide.

Who owns US085 over Belle Fourche Rv?

It is owned by the State Highway Agency.