US Bridges

County Highway over Knife River

Good

Dunn County, North Dakota · 1 North 12 West Manning · Structure no. 000000013104390

Built
2005
20 years old
Condition
Good
inspected June 2021
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
50
2018 count
Owner
County
County Highway Agency

About this bridge

County Highway over Knife River is a concrete culvert carrying County Highway over Knife River in Dunn County, North Dakota. It was built in 2005, so it is 20 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 5% of them trucks, projected to reach 60 by 2038. The structure is 23 ft (7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCounty Highway
CrossesKnife River
Location1 North 12 West Manning
RouteCounty Highway 0
Coordinates47.24607, -103.01154
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionJune 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length23 ft (7 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2018)
Projected traffic60 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 County Highway over Knife River built?

It was built in 2005, making it 20 years old in 2025.

What condition is County Highway over Knife 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 2021.

How much traffic does County Highway over Knife River carry?

About 50 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is County Highway over Knife River?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.4 m).

Who owns County Highway over Knife River?

It is owned by the County Highway Agency.