US Bridges

N21 over US-30/UPRR 817-742-D

Fair

Dawson County, Nebraska · In Cozad · Structure no. S021 01383

Built
1966
59 years old, rebuilt 1983
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
744 ft
9 main spans
Daily traffic
4,270
2018 count
Owner
State
State Highway Agency

About this bridge

N21 over US-30/UPRR 817-742-D is a steel continuous stringer/multi-beam or girder carrying N21 over US-30/UPRR 817-742-D in Dawson County, Nebraska. It was built in 1966 and reconstructed in 1983, so it is 59 years old, older than the Nebraska average of 47.1 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 4,270 vehicles a day, roughly 7% of them trucks, projected to reach 5,551 by 2038. The structure is 744 ft (226.8 m) long and 36 ft wide. If it were closed, the detour would be 12.4 mi (20 km).

Location

Open in Google Maps
CarriesN21
CrossesUS-30/UPRR 817-742-D
LocationIn Cozad
RouteState Highway 21
CountyDawson County
StateNebraska
Coordinates40.8562, -99.9839
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.6 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadUnknown
Structure length744 ft (226.8 m)
Longest span108 ft (32.9 m)
Deck width36 ft (10.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,270 (2018)
Projected traffic5,551 by 2038
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed12.4 mi (20 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was N21 over US-30/UPRR 817-742-D built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1983.

What condition is N21 over US-30/UPRR 817-742-D 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 November 2023.

How much traffic does N21 over US-30/UPRR 817-742-D carry?

About 4,270 vehicles per day (2018 count), of which roughly 7% are trucks.

How long is N21 over US-30/UPRR 817-742-D?

The structure is 744 ft (226.8 m) long with a longest span of 108 ft (32.9 m) and a deck 36 ft wide.

Who owns N21 over US-30/UPRR 817-742-D?

It is owned by the State Highway Agency.