US Bridges

US Highway 85 over South Branch Green River

Good

Billings County, North Dakota · 9 North of Jct. I-94 · Structure no. 0085084342

Built
1971
54 years old
Condition
Good
inspected June 2024
Type
Slab
Concrete Continuous
Length
75 ft
3 main spans
Daily traffic
1,210
2019 count
Owner
State
State Highway Agency

About this bridge

US Highway 85 over South Branch Green River is a concrete continuous slab carrying US Highway 85 over South Branch Green River in Billings County, North Dakota. It was built in 1971, so it is 54 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 1,210 vehicles a day, roughly 21% of them trucks, projected to reach 2,211 by 2039. The structure is 75 ft (22.9 m) long and 40 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesUS Highway 85
CrossesSouth Branch Green River
Location9 North of Jct. I-94
RouteU.S. Route 85
Coordinates47.01821, -103.202
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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating63.1 US tons
Inventory rating37.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span28 ft (8.5 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,210 (2019)
Projected traffic2,211 by 2039
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 South Branch Green River built?

It was built in 1971, making it 54 years old in 2025.

What condition is US Highway 85 over South Branch Green 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 June 2024.

How much traffic does US Highway 85 over South Branch Green River carry?

About 1,210 vehicles per day (2019 count), of which roughly 21% are trucks.

How long is US Highway 85 over South Branch Green River?

The structure is 75 ft (22.9 m) long with a longest span of 28 ft (8.5 m) and a deck 40 ft wide.

Who owns US Highway 85 over South Branch Green River?

It is owned by the State Highway Agency.