US Bridges

Nd Highway 21 over Creek

Good

Slope County, North Dakota · 4 East of JCT US 85 · Structure no. 0021007381

Built
2021
4 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete
Length
48 ft
4 main spans
Daily traffic
440
2016 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 21 over Creek is a concrete culvert carrying Nd Highway 21 over Creek in Slope 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 440 vehicles a day, roughly 20% of them trucks, projected to reach 540 by 2036. The structure is 48 ft (14.5 m) long. If it were closed, the detour would be 52.2 mi (84 km).

CarriesNd Highway 21
CrossesCreek
Location4 East of JCT US 85
RouteState Highway 21
Coordinates46.52621, -103.04228
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
Channel and channel protection9 ExcellentNo problems noted.
Culvert9 ExcellentNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating45.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHL 93
Structure length48 ft (14.5 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic440 (2016)
Projected traffic540 by 2036
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.2 mi (84 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nd Highway 21 over Creek built?

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

What condition is Nd Highway 21 over Creek 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 May 2023.

How much traffic does Nd Highway 21 over Creek carry?

About 440 vehicles per day (2016 count), of which roughly 20% are trucks.

How long is Nd Highway 21 over Creek?

The structure is 48 ft (14.5 m) long with a longest span of 11 ft (3.4 m).

Who owns Nd Highway 21 over Creek?

It is owned by the State Highway Agency.