US Bridges

N121 over N Fk Elkhorn River

Fair

Knox County, Nebraska · 3S Wausa · Structure no. S121 04559

Built
1987
38 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete Continuous
Length
91 ft
3 main spans
Daily traffic
660
2018 count
Owner
State
State Highway Agency

About this bridge

N121 over N Fk Elkhorn River is a concrete continuous slab carrying N121 over N Fk Elkhorn River in Knox County, Nebraska. It was built in 1987, so it is 38 years old, younger 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 660 vehicles a day, roughly 11% of them trucks, projected to reach 891 by 2038. The structure is 91 ft (27.7 m) long and 32 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

CarriesN121
CrossesN Fk Elkhorn River
Location3S Wausa
RouteState Highway 121
Coordinates42.453, -97.544
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.8 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span36 ft (11 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic660 (2018)
Projected traffic891 by 2038
Trucks11%
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 N Fk Elkhorn River built?

It was built in 1987, making it 38 years old in 2025.

What condition is N121 over N Fk Elkhorn River 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 October 2024.

How much traffic does N121 over N Fk Elkhorn River carry?

About 660 vehicles per day (2018 count), of which roughly 11% are trucks.

How long is N121 over N Fk Elkhorn River?

The structure is 91 ft (27.7 m) long with a longest span of 36 ft (11 m) and a deck 32 ft wide.

Who owns N121 over N Fk Elkhorn River?

It is owned by the State Highway Agency.