US Bridges

Nd Highway 21 over Dayton Creek

Fair

Hettinger County, North Dakota · West of West JCT Nd 8 · Structure no. 0021044635

Built
1938
87 years old, rebuilt 1957
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
31 ft
3 main spans
Daily traffic
400
2019 count
Owner
State
State Highway Agency

About this bridge

Nd Highway 21 over Dayton Creek is a concrete culvert carrying Nd Highway 21 over Dayton Creek in Hettinger County, North Dakota. It was built in 1938 and reconstructed in 1957, so it is 87 years old, older 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 5 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 400 vehicles a day, roughly 15% of them trucks, projected to reach 387 by 2039. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 52.2 mi (84 km).

Location

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CarriesNd Highway 21
CrossesDayton Creek
LocationWest of West JCT Nd 8
RouteState Highway 21
CountyHettinger County
StateNorth Dakota
Coordinates46.37041, -102.46958
Functional classRural Principal Arterial - Other

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length31 ft (9.4 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 traffic400 (2019)
Projected traffic387 by 2039
Trucks15%
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 Dayton Creek built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1957.

What condition is Nd Highway 21 over Dayton Creek 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 June 2023.

How much traffic does Nd Highway 21 over Dayton Creek carry?

About 400 vehicles per day (2019 count), of which roughly 15% are trucks.

How long is Nd Highway 21 over Dayton Creek?

The structure is 31 ft (9.4 m) long with a longest span of 10 ft (3 m).

Who owns Nd Highway 21 over Dayton Creek?

It is owned by the State Highway Agency.