US Bridges

N61 over Niobrara River

Good

Cherry County, Nebraska · 9S Merriman · Structure no. S061 21751

Built
2007
18 years old
Condition
Good
inspected March 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
300 ft
3 main spans
Daily traffic
205
2018 count
Owner
State
State Highway Agency

About this bridge

N61 over Niobrara River is a prestressed concrete continuous stringer/multi-beam or girder carrying N61 over Niobrara River in Cherry County, Nebraska. It was built in 2007, so it is 18 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 205 vehicles a day, roughly 15% of them trucks, projected to reach 267 by 2038. The structure is 300 ft (91.4 m) long and 39 ft wide. If it were closed, the detour would be 267.2 mi (430 km).

CarriesN61
CrossesNiobrara River
Location9S Merriman
RouteState Highway 61
Coordinates42.813, -101.689
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
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 evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating39.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length300 ft (91.4 m)
Longest span120 ft (36.6 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic205 (2018)
Projected traffic267 by 2038
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed267.2 mi (430 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 N61 over Niobrara River built?

It was built in 2007, making it 18 years old in 2025.

What condition is N61 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 N61 over Niobrara River carry?

About 205 vehicles per day (2018 count), of which roughly 15% are trucks.

How long is N61 over Niobrara River?

The structure is 300 ft (91.4 m) long with a longest span of 120 ft (36.6 m) and a deck 39 ft wide.

Who owns N61 over Niobrara River?

It is owned by the State Highway Agency.