US Bridges

River Road over Little Missouri Rv

Good

Harding County, South Dakota · 3.7S 7.8W Ladner · Structure no. 000000032082122

Built
2006
19 years old
Condition
Good
inspected April 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
45
2022 count
Owner
County
County Highway Agency

About this bridge

River Road over Little Missouri Rv is a concrete continuous culvert carrying River Road over Little Missouri Rv in Harding County, South Dakota. It was built in 2006, so it is 19 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 45 vehicles a day, roughly 9% of them trucks, projected to reach 60 by 2032. The structure is 21 ft (6.3 m) long. If it were closed, the detour would be 42.3 mi (68 km).

CarriesRiver Road
CrossesLittle Missouri Rv
Location3.7S 7.8W Ladner
RouteCounty Highway 6156
Coordinates45.77459, -103.88871
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionApril 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
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating37.7 US tons
Inventory rating22.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic60 by 2032
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 River Road over Little Missouri Rv built?

It was built in 2006, making it 19 years old in 2025.

What condition is River Road over Little Missouri Rv in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does River Road over Little Missouri Rv carry?

About 45 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is River Road over Little Missouri Rv?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m).

Who owns River Road over Little Missouri Rv?

It is owned by the County Highway Agency.