US Bridges

IRR SD065 over Moreau Rv

Fair

Ziebach County, South Dakota · 12.8 S JCT Sd 20 · Structure no. 000000069249183

Built
1972
53 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
370 ft
3 main spans
Daily traffic
580
2024 count
Owner
State
State Highway Agency

About this bridge

IRR SD065 over Moreau Rv is a steel continuous stringer/multi-beam or girder carrying IRR SD065 over Moreau Rv in Ziebach County, South Dakota. It was built in 1972, so it is 53 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 580 vehicles a day, roughly 13% of them trucks, projected to reach 879 by 2044. The structure is 370 ft (112.8 m) long and 39 ft wide. If it were closed, the detour would be 41 mi (66 km).

Location

Open in Google Maps
CarriesIRR SD065
CrossesMoreau Rv
Location12.8 S JCT Sd 20
RouteState Highway 65
CountyZiebach County
StateSouth Dakota
Coordinates45.2083, -101.5072
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating23.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length370 ft (112.8 m)
Longest span150 ft (45.7 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic580 (2024)
Projected traffic879 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed41 mi (66 km)
TollOn a free road
National Highway SystemNo

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 IRR SD065 over Moreau Rv built?

It was built in 1972, making it 53 years old in 2025.

What condition is IRR SD065 over 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 August 2024.

How much traffic does IRR SD065 over Moreau Rv carry?

About 580 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is IRR SD065 over Moreau Rv?

The structure is 370 ft (112.8 m) long with a longest span of 150 ft (45.7 m) and a deck 39 ft wide.

Who owns IRR SD065 over Moreau Rv?

It is owned by the State Highway Agency.