US Bridges

US81 over Yankton Slough Trib

Good

Pierce County, Nebraska · JCT US81/US20 8S · Structure no. S081 17161

Built
2022
3 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
125 ft
3 main spans
Daily traffic
4,245
2018 count
Owner
State
State Highway Agency

About this bridge

US81 over Yankton Slough Trib is a concrete continuous slab carrying US81 over Yankton Slough Trib in Pierce County, Nebraska. It was built in 2022, so it is 3 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,245 vehicles a day, roughly 18% of them trucks, projected to reach 6,368 by 2038. The structure is 125 ft (38.1 m) long and 47 ft wide. If it were closed, the detour would be 161.6 mi (260 km).

Location

Open in Google Maps
CarriesUS81
CrossesYankton Slough Trib
LocationJCT US81/US20 8S
RouteU.S. Route 81
CountyPierce County
StateNebraska
Coordinates42.2453, -97.42648
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating48.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length125 ft (38.1 m)
Longest span50 ft (15.2 m)
Deck width47 ft (14.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,245 (2018)
Projected traffic6,368 by 2038
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed161.6 mi (260 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US81 over Yankton Slough Trib built?

It was built in 2022, making it 3 years old in 2025.

What condition is US81 over Yankton Slough Trib 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 US81 over Yankton Slough Trib carry?

About 4,245 vehicles per day (2018 count), of which roughly 18% are trucks.

How long is US81 over Yankton Slough Trib?

The structure is 125 ft (38.1 m) long with a longest span of 50 ft (15.2 m) and a deck 47 ft wide.

Who owns US81 over Yankton Slough Trib?

It is owned by the State Highway Agency.