US Bridges

US085 over Indian Ck

Fair

Butte County, South Dakota · 16 NE JCT US 212 · Structure no. 000000010146229

Built
1965
60 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete Continuous
Length
140 ft
5 main spans
Daily traffic
1,037
2024 count
Owner
State
State Highway Agency

About this bridge

US085 over Indian Ck is a concrete continuous slab carrying US085 over Indian Ck in Butte County, South Dakota. It was built in 1965, so it is 60 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 1,037 vehicles a day, roughly 21% of them trucks, projected to reach 1,488 by 2044. The structure is 140 ft (42.7 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesUS085
CrossesIndian Ck
Location16 NE JCT US 212
RouteU.S. Route 85
Coordinates44.88131, -103.75968
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating62.9 US tons
Inventory rating37.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span28 ft (8.6 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,037 (2024)
Projected traffic1,488 by 2044
Trucks21%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$96,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US085 over Indian Ck built?

It was built in 1965, making it 60 years old in 2025.

What condition is US085 over Indian Ck 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 March 2024.

How much traffic does US085 over Indian Ck carry?

About 1,037 vehicles per day (2024 count), of which roughly 21% are trucks.

How long is US085 over Indian Ck?

The structure is 140 ft (42.7 m) long with a longest span of 28 ft (8.6 m) and a deck 34 ft wide.

Who owns US085 over Indian Ck?

It is owned by the State Highway Agency.