US Bridges

N97 over Niobrara River

Good

Cherry County, Nebraska · 9SW Valentine · Structure no. S097 13367

Built
1994
31 years old
Condition
Good
inspected March 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
203 ft
3 main spans
Daily traffic
500
2018 count
Owner
State
State Highway Agency

About this bridge

N97 over Niobrara River is a prestressed concrete continuous stringer/multi-beam or girder carrying N97 over Niobrara River in Cherry County, Nebraska. It was built in 1994, so it is 31 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 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 500 vehicles a day, roughly 10% of them trucks, projected to reach 700 by 2038. The structure is 203 ft (61.9 m) long and 38 ft wide. If it were closed, the detour would be 559.2 mi (900 km).

CarriesN97
CrossesNiobrara River
Location9SW Valentine
RouteState Highway 97
Coordinates42.8074, -100.6664
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 protection8 Very GoodNo problems noted.
Last inspectionMarch 2025
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.7 US tons
Inventory rating56.2 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length203 ft (61.9 m)
Longest span100 ft (30.5 m)
Deck width38 ft (11.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2018)
Projected traffic700 by 2038
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed559.2 mi (900 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 N97 over Niobrara River built?

It was built in 1994, making it 31 years old in 2025.

What condition is N97 over Niobrara 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 2025.

How much traffic does N97 over Niobrara River carry?

About 500 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is N97 over Niobrara River?

The structure is 203 ft (61.9 m) long with a longest span of 100 ft (30.5 m) and a deck 38 ft wide.

Who owns N97 over Niobrara River?

It is owned by the State Highway Agency.