US Bridges

493rd Ave over Blackbird Creek

Good

Holt County, Nebraska · 8.3N Oneill · Structure no. C004536305

Built
1981
44 years old, rebuilt 2020
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
5
2003 count
Owner
County
County Highway Agency

About this bridge

493rd Ave over Blackbird Creek is a steel stringer/multi-beam or girder carrying 493rd Ave over Blackbird Creek in Holt County, Nebraska. It was built in 1981 and reconstructed in 2020, so it is 44 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 5 vehicles a day, projected to reach 6 by 2033. The structure is 40 ft (12.2 m) long and 21 ft wide. If it were closed, the detour would be 68.4 mi (110 km).

Location

Open in Google Maps
Carries493rd Ave
CrossesBlackbird Creek
Location8.3N Oneill
RouteCounty Highway 363
CountyHolt County
StateNebraska
Coordinates42.5857, -98.6382
Functional classRural Local

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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating62.8 US tons
Inventory rating37.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width21 ft (6.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2003)
Projected traffic6 by 2033
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed68.4 mi (110 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 493rd Ave over Blackbird Creek built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2020.

What condition is 493rd Ave over Blackbird Creek 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 493rd Ave over Blackbird Creek carry?

About 5 vehicles per day (2003 count).

How long is 493rd Ave over Blackbird Creek?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 21 ft wide.

Who owns 493rd Ave over Blackbird Creek?

It is owned by the County Highway Agency.