US Bridges

County Highway over Trib. Little Missouri

Good

Bowman County, North Dakota · 20 South Marmarth · Structure no. 000000006105180

Built
2008
17 years old
Condition
Good
inspected October 2021
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
90
2017 count
Owner
County
County Highway Agency

About this bridge

County Highway over Trib. Little Missouri is a concrete culvert carrying County Highway over Trib. Little Missouri in Bowman County, North Dakota. It was built in 2008, so it is 17 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 90 vehicles a day, projected to reach 40 by 2037. The structure is 25 ft (7.5 m) long and 120 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCounty Highway
CrossesTrib. Little Missouri
Location20 South Marmarth
RouteCounty Highway 605
CountyBowman County
StateNorth Dakota
Coordinates46.01999, -103.9642
Functional classRural Major Collector

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 inspectionOctober 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 length25 ft (7.5 m)
Longest span12 ft (3.7 m)
Deck width120 ft (36.6 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2017)
Projected traffic40 by 2037
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Trib. Little Missouri built?

It was built in 2008, making it 17 years old in 2025.

What condition is County Highway over Trib. Little Missouri 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 October 2021.

How much traffic does County Highway over Trib. Little Missouri carry?

About 90 vehicles per day (2017 count).

How long is County Highway over Trib. Little Missouri?

The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.7 m) and a deck 120 ft wide.

Who owns County Highway over Trib. Little Missouri?

It is owned by the County Highway Agency.