US Bridges

N12 over Stream

Fair

Boyd County, Nebraska · 4W Lynch · Structure no. S012 13280

Built
1992
33 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
630
2018 count
Owner
State
State Highway Agency

About this bridge

N12 over Stream is a concrete culvert carrying N12 over Stream in Boyd County, Nebraska. It was built in 1992, so it is 33 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 630 vehicles a day, roughly 10% of them trucks, projected to reach 851 by 2038. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 80.8 mi (130 km).

Location

Open in Google Maps
CarriesN12
CrossesStream
Location4W Lynch
RouteState Highway 12
CountyBoyd County
StateNebraska
Coordinates42.8305, -98.5345
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal 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 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 traffic630 (2018)
Projected traffic851 by 2038
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed80.8 mi (130 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 N12 over Stream built?

It was built in 1992, making it 33 years old in 2025.

What condition is N12 over Stream 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 March 2023.

How much traffic does N12 over Stream carry?

About 630 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is N12 over Stream?

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

Who owns N12 over Stream?

It is owned by the State Highway Agency.