US Bridges

N121 over Beaver Creek

Good

Knox County, Nebraska · 3N Crofton · Structure no. S121 06970

Built
1965
60 years old, rebuilt 2021
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
105 ft
1 main span
Daily traffic
1,100
2018 count
Owner
State
State Highway Agency

About this bridge

N121 over Beaver Creek is a prestressed concrete stringer/multi-beam or girder carrying N121 over Beaver Creek in Knox County, Nebraska. It was built in 1965 and reconstructed in 2021, so it is 60 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 1,100 vehicles a day, roughly 4% of them trucks, projected to reach 1,595 by 2038. The structure is 105 ft (32 m) long and 42 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

CarriesN121
CrossesBeaver Creek
Location3N Crofton
RouteState Highway 121
Coordinates42.7717, -97.5056
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.8 US tons
Inventory rating45.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length105 ft (32 m)
Longest span103 ft (31.4 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2018)
Projected traffic1,595 by 2038
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 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 N121 over Beaver Creek built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 2021.

What condition is N121 over Beaver Creek 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 2024.

How much traffic does N121 over Beaver Creek carry?

About 1,100 vehicles per day (2018 count), of which roughly 4% are trucks.

How long is N121 over Beaver Creek?

The structure is 105 ft (32 m) long with a longest span of 103 ft (31.4 m) and a deck 42 ft wide.

Who owns N121 over Beaver Creek?

It is owned by the State Highway Agency.