US Bridges

59th Street SW over Little Missouri River

Fair

Slope County, North Dakota · 22 West 5 North of Amidon · Structure no. 000000044113050

Built
2002
23 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
67 ft
6 main spans
Daily traffic
20
2018 count
Owner
County
County Highway Agency

About this bridge

59th Street SW over Little Missouri River is a concrete culvert carrying 59th Street SW over Little Missouri River in Slope County, North Dakota. It was built in 2002, so it is 23 years old, younger than the North Dakota average of 48.2 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 20 vehicles a day, projected to reach 20 by 2038. The structure is 67 ft (20.4 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Carries59th Street SW
CrossesLittle Missouri River
Location22 West 5 North of Amidon
RouteCounty Highway 4404
Coordinates46.56155, -103.78856
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72 US tons
Inventory rating42.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans6
Design loadHS 25 or greater
Structure length67 ft (20.4 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 traffic20 (2018)
Projected traffic20 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 59th Street SW over Little Missouri River built?

It was built in 2002, making it 23 years old in 2025.

What condition is 59th Street SW over Little Missouri River 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 October 2024.

How much traffic does 59th Street SW over Little Missouri River carry?

About 20 vehicles per day (2018 count).

How long is 59th Street SW over Little Missouri River?

The structure is 67 ft (20.4 m) long with a longest span of 10 ft (3 m).

Who owns 59th Street SW over Little Missouri River?

It is owned by the County Highway Agency.