US Bridges

US Highway 12 over Bnrr Coal Spur

Good

Bowman County, North Dakota · 5 East of Jct. Nd 67 · Structure no. 0012051308

Built
1972
53 years old
Condition
Good
inspected July 2024
Type
Culvert
Steel
Length
28 ft
1 main span
Daily traffic
650
2019 count
Owner
State
State Highway Agency

About this bridge

US Highway 12 over Bnrr Coal Spur is a steel culvert carrying US Highway 12 over Bnrr Coal Spur in Bowman County, North Dakota. It was built in 1972, so it is 53 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 650 vehicles a day, roughly 23% of them trucks, projected to reach 1,088 by 2039. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 57.2 mi (92 km).

CarriesUS Highway 12
CrossesBnrr Coal Spur
Location5 East of Jct. Nd 67
RouteU.S. Route 12
Coordinates46.119, -103.05399
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
Culvert7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating21.4 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span26 ft (7.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2019)
Projected traffic1,088 by 2039
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed57.2 mi (92 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US Highway 12 over Bnrr Coal Spur built?

It was built in 1972, making it 53 years old in 2025.

What condition is US Highway 12 over Bnrr Coal Spur 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 12 over Bnrr Coal Spur carry?

About 650 vehicles per day (2019 count), of which roughly 23% are trucks.

How long is US Highway 12 over Bnrr Coal Spur?

The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m).

Who owns US Highway 12 over Bnrr Coal Spur?

It is owned by the State Highway Agency.