US Bridges

N21 over Stream

Good

Custer County, Nebraska · 1S Oconto · Structure no. S021 05212

Built
1962
63 years old
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
920
2018 count
Owner
State
State Highway Agency

About this bridge

N21 over Stream is a concrete culvert carrying N21 over Stream in Custer County, Nebraska. It was built in 1962, so it is 63 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 920 vehicles a day, roughly 26% of them trucks, projected to reach 1,196 by 2038. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 18.6 mi (30 km).

CarriesN21
CrossesStream
Location1S Oconto
RouteState Highway 21
Coordinates41.1309, -99.7598
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
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 traffic920 (2018)
Projected traffic1,196 by 2038
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 N21 over Stream built?

It was built in 1962, making it 63 years old in 2025.

What condition is N21 over Stream 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 November 2024.

How much traffic does N21 over Stream carry?

About 920 vehicles per day (2018 count), of which roughly 26% are trucks.

How long is N21 over Stream?

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

Who owns N21 over Stream?

It is owned by the State Highway Agency.