US Bridges

US81 over Missouri River

Fair

Cedar County, Nebraska · Scl Yankton · Structure no. S081 21489

Built
2007
18 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,589 ft
6 main spans
Daily traffic
7,755
2018 count
Owner
State
State Highway Agency

About this bridge

US81 over Missouri River is a steel continuous stringer/multi-beam or girder carrying US81 over Missouri River in Cedar County, Nebraska. It was built in 2007, so it is 18 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 5 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 7,755 vehicles a day, roughly 10% of them trucks, projected to reach 11,633 by 2038. The structure is 1,589 ft (484.3 m) long and 76 ft wide. If it were closed, the detour would be 149.1 mi (240 km).

Location

Open in Google Maps
CarriesUS81
CrossesMissouri River
LocationScl Yankton
RouteU.S. Route 81
CountyCedar County
StateNebraska
Coordinates42.865, -97.397
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.4 US tons
Inventory rating41.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHL 93
Structure length1,589 ft (484.3 m)
Longest span280 ft (85.3 m)
Deck width76 ft (23.3 m)
Roadway width74 ft (22.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,755 (2018)
Projected traffic11,633 by 2038
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed149.1 mi (240 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 Missouri River built?

It was built in 2007, making it 18 years old in 2025.

What condition is US81 over Missouri River 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 2024.

How much traffic does US81 over Missouri River carry?

About 7,755 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is US81 over Missouri River?

The structure is 1,589 ft (484.3 m) long with a longest span of 280 ft (85.3 m) and a deck 76 ft wide.

Who owns US81 over Missouri River?

It is owned by the State Highway Agency.