US Bridges

US085 over North Br Moreau Rv

Fair

Harding County, South Dakota · 10 N Butte CO Line · Structure no. 000000032250411

Built
1974
51 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
167 ft
3 main spans
Daily traffic
1,190
2024 count
Owner
State
State Highway Agency

About this bridge

US085 over North Br Moreau Rv is a prestressed concrete continuous stringer/multi-beam or girder carrying US085 over North Br Moreau Rv in Harding County, South Dakota. It was built in 1974, so it is 51 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 1,190 vehicles a day, roughly 31% of them trucks, projected to reach 1,708 by 2044. The structure is 167 ft (50.8 m) long and 47 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

CarriesUS085
CrossesNorth Br Moreau Rv
Location10 N Butte CO Line
RouteU.S. Route 85
Coordinates45.35809, -103.54872
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating51 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length167 ft (50.8 m)
Longest span64 ft (19.4 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,190 (2024)
Projected traffic1,708 by 2044
Trucks31%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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 North Br Moreau Rv built?

It was built in 1974, making it 51 years old in 2025.

What condition is US085 over North Br Moreau 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 North Br Moreau Rv carry?

About 1,190 vehicles per day (2024 count), of which roughly 31% are trucks.

How long is US085 over North Br Moreau Rv?

The structure is 167 ft (50.8 m) long with a longest span of 64 ft (19.4 m) and a deck 47 ft wide.

Who owns US085 over North Br Moreau Rv?

It is owned by the State Highway Agency.