US Bridges

US085 S over Redwater Rv

Fair

Lawrence County, South Dakota · At Butte CO Line · Structure no. 000000041094010

Built
1986
39 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete Continuous
Length
159 ft
4 main spans
Daily traffic
4,388
2024 count
Owner
State
State Highway Agency

About this bridge

US085 S over Redwater Rv is a concrete continuous slab carrying US085 S over Redwater Rv in Lawrence County, South Dakota. It was built in 1986, so it is 39 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 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 4,388 vehicles a day, roughly 9% of them trucks, projected to reach 6,297 by 2044. The structure is 159 ft (48.6 m) long and 47 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesUS085 S
CrossesRedwater Rv
LocationAt Butte CO Line
RouteU.S. Route 85
CountyLawrence County
StateSouth Dakota
Coordinates44.59022, -103.86147
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating74.4 US tons
Inventory rating44.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length159 ft (48.6 m)
Longest span41 ft (12.6 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,388 (2024)
Projected traffic6,297 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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 S over Redwater Rv built?

It was built in 1986, making it 39 years old in 2025.

What condition is US085 S over Redwater 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 January 2024.

How much traffic does US085 S over Redwater Rv carry?

About 4,388 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is US085 S over Redwater Rv?

The structure is 159 ft (48.6 m) long with a longest span of 41 ft (12.6 m) and a deck 47 ft wide.

Who owns US085 S over Redwater Rv?

It is owned by the State Highway Agency.