US Bridges

N21 over Dawson County Canal

Good

Dawson County, Nebraska · .3S Cozad · Structure no. S021 01319

Built
2024
1 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
42 ft
4 main spans
Daily traffic
4,200
2018 count
Owner
State
State Highway Agency

About this bridge

N21 over Dawson County Canal is a concrete culvert carrying N21 over Dawson County Canal in Dawson County, Nebraska. It was built in 2024, so it is 1 years old, younger than the Nebraska average of 47.1 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 4,200 vehicles a day, roughly 9% of them trucks, projected to reach 5,460 by 2038. The structure is 42 ft (12.8 m) long and 53 ft wide. If it were closed, the detour would be 142.9 mi (230 km).

Location

Open in Google Maps
CarriesN21
CrossesDawson County Canal
Location.3S Cozad
RouteState Highway 21
CountyDawson County
StateNebraska
Coordinates40.8474, -99.9859
Functional classRural Minor Arterial

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.
Culvert8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.2 US tons
Inventory rating51.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHL 93
Structure length42 ft (12.8 m)
Longest span10 ft (3 m)
Deck width53 ft (16.2 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (2018)
Projected traffic5,460 by 2038
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed142.9 mi (230 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 N21 over Dawson County Canal built?

It was built in 2024, making it 1 years old in 2025.

What condition is N21 over Dawson County Canal 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 2023.

How much traffic does N21 over Dawson County Canal carry?

About 4,200 vehicles per day (2018 count), of which roughly 9% are trucks.

How long is N21 over Dawson County Canal?

The structure is 42 ft (12.8 m) long with a longest span of 10 ft (3 m) and a deck 53 ft wide.

Who owns N21 over Dawson County Canal?

It is owned by the State Highway Agency.