US Bridges

N21 over Stream

Good

Custer County, Nebraska · 2SW Broken Bow · Structure no. S021 07181

Built
2006
19 years old
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
28 ft
3 main spans
Daily traffic
1,920
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 2006, so it is 19 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 1,920 vehicles a day, roughly 12% of them trucks, projected to reach 2,592 by 2038. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 68.4 mi (110 km).

Location

Open in Google Maps
CarriesN21
CrossesStream
Location2SW Broken Bow
RouteState Highway 21
CountyCuster County
StateNebraska
Coordinates41.3755, -99.6384
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 protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.4 US tons
Inventory rating36.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,920 (2018)
Projected traffic2,592 by 2038
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed68.4 mi (110 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 2006, making it 19 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 1,920 vehicles per day (2018 count), of which roughly 12% are trucks.

How long is N21 over Stream?

The structure is 28 ft (8.5 m) long with a longest span of 9 ft (2.7 m).

Who owns N21 over Stream?

It is owned by the State Highway Agency.