US Bridges

N12 over Keya Paha River

Good

Keya Paha County, Nebraska · 0S Brocskburg · Structure no. S012 08127

Built
1957
68 years old
Condition
Good
inspected March 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
197 ft
3 main spans
Daily traffic
400
2018 count
Owner
State
State Highway Agency

About this bridge

N12 over Keya Paha River is a concrete continuous box beam or girders - multiple carrying N12 over Keya Paha River in Keya Paha County, Nebraska. It was built in 1957, so it is 68 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 400 vehicles a day, roughly 11% of them trucks, projected to reach 540 by 2038. The structure is 197 ft (60 m) long and 31 ft wide. If it were closed, the detour would be 118.1 mi (190 km).

CarriesN12
CrossesKeya Paha River
Location0S Brocskburg
RouteState Highway 12
Coordinates42.9287, -99.3318
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: 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 rating46.3 US tons
Inventory rating27.6 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length197 ft (60 m)
Longest span85 ft (25.9 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2018)
Projected traffic540 by 2038
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed118.1 mi (190 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 Keya Paha River built?

It was built in 1957, making it 68 years old in 2025.

What condition is N12 over Keya Paha River 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 March 2023.

How much traffic does N12 over Keya Paha River carry?

About 400 vehicles per day (2018 count), of which roughly 11% are trucks.

How long is N12 over Keya Paha River?

The structure is 197 ft (60 m) long with a longest span of 85 ft (25.9 m) and a deck 31 ft wide.

Who owns N12 over Keya Paha River?

It is owned by the State Highway Agency.