US Bridges

Nd Highway 66 over Big Coulee

Fair

Towner County, North Dakota · 5 West of US 281 · Structure no. 0066033130

Built
2001
24 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
340
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 66 over Big Coulee is a concrete culvert carrying Nd Highway 66 over Big Coulee in Towner County, North Dakota. It was built in 2001, so it is 24 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 340 vehicles a day, roughly 26% of them trucks, projected to reach 340 by 2039. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 60.9 mi (98 km).

Location

Open in Google Maps
CarriesNd Highway 66
CrossesBig Coulee
Location5 West of US 281
RouteState Highway 66
CountyTowner County
StateNorth Dakota
Coordinates48.63149, -99.36002
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.3 US tons
Inventory rating37.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 25 or greater
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic340 (2019)
Projected traffic340 by 2039
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.9 mi (98 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nd Highway 66 over Big Coulee built?

It was built in 2001, making it 24 years old in 2025.

What condition is Nd Highway 66 over Big Coulee in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

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

About 340 vehicles per day (2019 count), of which roughly 26% are trucks.

How long is Nd Highway 66 over Big Coulee?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m).

Who owns Nd Highway 66 over Big Coulee?

It is owned by the State Highway Agency.