US Bridges

470th Ave over Keya Paha River

Good

Boyd County, Nebraska · JCT N12/S-8A 2.8S · Structure no. C000801705

Built
1977
48 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
175 ft
3 main spans
Daily traffic
100
2011 count
Owner
County
County Highway Agency

About this bridge

470th Ave over Keya Paha River is a steel continuous stringer/multi-beam or girder carrying 470th Ave over Keya Paha River in Boyd County, Nebraska. It was built in 1977, so it is 48 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 100 vehicles a day, projected to reach 95 by 2033. The structure is 175 ft (53.3 m) long and 30 ft wide. If it were closed, the detour would be 118.1 mi (190 km).

Location

Open in Google Maps
Carries470th Ave
CrossesKeya Paha River
LocationJCT N12/S-8A 2.8S
RouteCounty Highway 2115
CountyBoyd County
StateNebraska
Coordinates42.9158, -99.0978
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length175 ft (53.3 m)
Longest span70 ft (21.3 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2011)
Projected traffic95 by 2033
Trucks0%
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

OwnerCounty Highway Agency
Maintained byCounty 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 470th Ave over Keya Paha River built?

It was built in 1977, making it 48 years old in 2025.

What condition is 470th Ave 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 September 2024.

How much traffic does 470th Ave over Keya Paha River carry?

About 100 vehicles per day (2011 count).

How long is 470th Ave over Keya Paha River?

The structure is 175 ft (53.3 m) long with a longest span of 70 ft (21.3 m) and a deck 30 ft wide.

Who owns 470th Ave over Keya Paha River?

It is owned by the County Highway Agency.