US Bridges

US Highway 85 over North Fork Grand River

Good

Bowman County, North Dakota · 2 North S.D. Border · Structure no. 0085001686

Built
1966
59 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
155 ft
3 main spans
Daily traffic
1,010
2019 count
Owner
State
State Highway Agency

About this bridge

US Highway 85 over North Fork Grand River is a steel continuous stringer/multi-beam or girder carrying US Highway 85 over North Fork Grand River in Bowman County, North Dakota. It was built in 1966, so it is 59 years old, older 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 1,010 vehicles a day, roughly 18% of them trucks, projected to reach 1,338 by 2039. The structure is 155 ft (47.2 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesUS Highway 85
CrossesNorth Fork Grand River
Location2 North S.D. Border
RouteU.S. Route 85
Coordinates45.96491, -103.4091
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 protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating66.4 US tons
Inventory rating39.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length155 ft (47.2 m)
Longest span58 ft (17.7 m)
Deck width36 ft (10.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,010 (2019)
Projected traffic1,338 by 2039
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 North Fork Grand River built?

It was built in 1966, making it 59 years old in 2025.

What condition is US Highway 85 over North Fork Grand 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 July 2024.

How much traffic does US Highway 85 over North Fork Grand River carry?

About 1,010 vehicles per day (2019 count), of which roughly 18% are trucks.

How long is US Highway 85 over North Fork Grand River?

The structure is 155 ft (47.2 m) long with a longest span of 58 ft (17.7 m) and a deck 36 ft wide.

Who owns US Highway 85 over North Fork Grand River?

It is owned by the State Highway Agency.