US Bridges

N12 over Ponca Creek Trib

Good

Boyd County, Nebraska · 2W Monowi · Structure no. S012 14129

Built
1992
33 years old
Condition
Good
inspected March 2021
Type
Slab
Concrete Continuous
Length
77 ft
3 main spans
Daily traffic
560
2018 count
Owner
State
State Highway Agency

About this bridge

N12 over Ponca Creek Trib is a concrete continuous slab carrying N12 over Ponca Creek Trib 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 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 560 vehicles a day, roughly 9% of them trucks, projected to reach 728 by 2038. The structure is 77 ft (23.5 m) long and 38 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

Location

Open in Google Maps
CarriesN12
CrossesPonca Creek Trib
Location2W Monowi
RouteState Highway 12
CountyBoyd County
StateNebraska
Coordinates42.8314, -98.3712
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
Deck9 ExcellentNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.9 US tons
Inventory rating44.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length77 ft (23.5 m)
Longest span30 ft (9.1 m)
Deck width38 ft (11.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic560 (2018)
Projected traffic728 by 2038
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 Ponca Creek Trib built?

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

What condition is N12 over Ponca Creek Trib 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 2021.

How much traffic does N12 over Ponca Creek Trib carry?

About 560 vehicles per day (2018 count), of which roughly 9% are trucks.

How long is N12 over Ponca Creek Trib?

The structure is 77 ft (23.5 m) long with a longest span of 30 ft (9.1 m) and a deck 38 ft wide.

Who owns N12 over Ponca Creek Trib?

It is owned by the State Highway Agency.