US Bridges

Nd Highway 66 over Mauvais Coulee

Good

Towner County, North Dakota · East of 281 South · Structure no. 0066040370

Built
2021
4 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete
Length
68 ft
4 main spans
Daily traffic
325
2018 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 66 over Mauvais Coulee is a concrete culvert carrying Nd Highway 66 over Mauvais Coulee in Towner County, North Dakota. It was built in 2021, so it is 4 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 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 325 vehicles a day, roughly 25% of them trucks, projected to reach 400 by 2038. The structure is 68 ft (20.6 m) long. If it were closed, the detour would be 54.1 mi (87 km).

Location

Open in Google Maps
CarriesNd Highway 66
CrossesMauvais Coulee
LocationEast of 281 South
RouteState Highway 66
CountyTowner County
StateNorth Dakota
Coordinates48.63144, -99.20193
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.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55.4 US tons
Inventory rating42.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHL 93
Structure length68 ft (20.6 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic325 (2018)
Projected traffic400 by 2038
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed54.1 mi (87 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nd Highway 66 over Mauvais Coulee built?

It was built in 2021, making it 4 years old in 2025.

What condition is Nd Highway 66 over Mauvais Coulee 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 November 2023.

How much traffic does Nd Highway 66 over Mauvais Coulee carry?

About 325 vehicles per day (2018 count), of which roughly 25% are trucks.

How long is Nd Highway 66 over Mauvais Coulee?

The structure is 68 ft (20.6 m) long with a longest span of 16 ft (4.9 m).

Who owns Nd Highway 66 over Mauvais Coulee?

It is owned by the State Highway Agency.