US Bridges

US81 over Yankton Slough

Fair

Pierce County, Nebraska · JCT US81/US20 · Structure no. S081 18005

Built
1990
35 years old
Condition
Fair
inspected October 2022
Type
Slab
Concrete Continuous
Length
82 ft
3 main spans
Daily traffic
3,740
2018 count
Owner
State
State Highway Agency

About this bridge

US81 over Yankton Slough is a concrete continuous slab carrying US81 over Yankton Slough in Pierce County, Nebraska. It was built in 1990, so it is 35 years old, younger than the Nebraska average of 47.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,740 vehicles a day, roughly 18% of them trucks, projected to reach 5,610 by 2038. The structure is 82 ft (25 m) long and 46 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

Open in Google Maps
CarriesUS81
CrossesYankton Slough
LocationJCT US81/US20
RouteU.S. Route 81
CountyPierce County
StateNebraska
Coordinates42.3674, -97.4262
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.2 US tons
Inventory rating39.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length82 ft (25 m)
Longest span32 ft (9.8 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,740 (2018)
Projected traffic5,610 by 2038
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 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 US81 over Yankton Slough built?

It was built in 1990, making it 35 years old in 2025.

What condition is US81 over Yankton Slough in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2022.

How much traffic does US81 over Yankton Slough carry?

About 3,740 vehicles per day (2018 count), of which roughly 18% are trucks.

How long is US81 over Yankton Slough?

The structure is 82 ft (25 m) long with a longest span of 32 ft (9.8 m) and a deck 46 ft wide.

Who owns US81 over Yankton Slough?

It is owned by the State Highway Agency.