US Bridges

US Highway 85 over Little Missouri River

Good

McKenzie County, North Dakota · 16 South of Nd 23 · Structure no. 0085126575

Built
2020
5 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
790 ft
5 main spans
Daily traffic
4,680
2017 count
Owner
State
State Highway Agency

About this bridge

US Highway 85 over Little Missouri River is a prestressed concrete stringer/multi-beam or girder carrying US Highway 85 over Little Missouri River in McKenzie County, North Dakota. It was built in 2020, so it is 5 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,680 vehicles a day, roughly 36% of them trucks, projected to reach 5,900 by 2037. The structure is 790 ft (240.8 m) long and 85 ft wide. If it were closed, the detour would be 44.7 mi (72 km).

CarriesUS Highway 85
CrossesLittle Missouri River
Location16 South of Nd 23
RouteU.S. Route 85
Coordinates47.59101, -103.25304
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating46.8 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5 (+2 approach)
Design loadHL 93
Structure length790 ft (240.8 m)
Longest span160 ft (48.8 m)
Deck width85 ft (25.9 m)
Roadway width82 ft (25.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,680 (2017)
Projected traffic5,900 by 2037
Trucks36%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.7 mi (72 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 US Highway 85 over Little Missouri River built?

It was built in 2020, making it 5 years old in 2025.

What condition is US Highway 85 over Little Missouri River 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 August 2023.

How much traffic does US Highway 85 over Little Missouri River carry?

About 4,680 vehicles per day (2017 count), of which roughly 36% are trucks.

How long is US Highway 85 over Little Missouri River?

The structure is 790 ft (240.8 m) long with a longest span of 160 ft (48.8 m) and a deck 85 ft wide.

Who owns US Highway 85 over Little Missouri River?

It is owned by the State Highway Agency.