US Bridges

NB-US77 over I129

Good

Dakota County, Nebraska · I129/US77 Interchg · Structure no. S129 00039

Built
1977
48 years old, rebuilt 2021
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
246 ft
2 main spans
Daily traffic
14,555
2016 count
Owner
State
State Highway Agency

About this bridge

NB-US77 over I129 is a steel continuous stringer/multi-beam or girder carrying NB-US77 over I129 in Dakota County, Nebraska. It was built in 1977 and reconstructed in 2021, 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 14,555 vehicles a day, roughly 4% of them trucks, projected to reach 27,858 by 2036. The structure is 246 ft (75 m) long and 51 ft wide.

Location

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CarriesNB-US77
CrossesI129
LocationI129/US77 Interchg
RouteU.S. Route 77
CountyDakota County
StateNebraska
Coordinates42.449, -96.4358
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.3 US tons
Inventory rating47.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length246 ft (75 m)
Longest span122 ft (37.2 m)
Deck width51 ft (15.4 m)
Roadway width50 ft (15.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,555 (2016)
Projected traffic27,858 by 2036
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB-US77 over I129 built?

It was built in 1977, making it 48 years old in 2025. It was reconstructed in 2021.

What condition is NB-US77 over I129 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 NB-US77 over I129 carry?

About 14,555 vehicles per day (2016 count), of which roughly 4% are trucks.

How long is NB-US77 over I129?

The structure is 246 ft (75 m) long with a longest span of 122 ft (37.2 m) and a deck 51 ft wide.

Who owns NB-US77 over I129?

It is owned by the State Highway Agency.