US Bridges

US20 over Yankton Slough

Good

Pierce County, Nebraska · 3W Randolph · Structure no. S020 37412

Built
1955
70 years old, rebuilt 1990
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
81 ft
3 main spans
Daily traffic
2,635
2018 count
Owner
State
State Highway Agency

About this bridge

US20 over Yankton Slough is a concrete continuous slab carrying US20 over Yankton Slough in Pierce County, Nebraska. It was built in 1955 and reconstructed in 1990, so it is 70 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 2,635 vehicles a day, roughly 14% of them trucks, projected to reach 3,426 by 2038. The structure is 81 ft (24.7 m) long and 45 ft wide. If it were closed, the detour would be 217.5 mi (350 km).

Location

Open in Google Maps
CarriesUS20
CrossesYankton Slough
Location3W Randolph
RouteU.S. Route 20
CountyPierce County
StateNebraska
Coordinates42.3661, -97.4229
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating30.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length81 ft (24.7 m)
Longest span33 ft (10.1 m)
Deck width45 ft (13.7 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,635 (2018)
Projected traffic3,426 by 2038
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed217.5 mi (350 km)
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US20 over Yankton Slough built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1990.

What condition is US20 over Yankton Slough 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 October 2024.

How much traffic does US20 over Yankton Slough carry?

About 2,635 vehicles per day (2018 count), of which roughly 14% are trucks.

How long is US20 over Yankton Slough?

The structure is 81 ft (24.7 m) long with a longest span of 33 ft (10.1 m) and a deck 45 ft wide.

Who owns US20 over Yankton Slough?

It is owned by the State Highway Agency.