US Bridges

US 6 over W Nishnabotna River

Fair

Pottawattamie County, Iowa · 0.5 Mi. W of W Jct. US 59 · Structure no. 000000000043291

Built
1985
40 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
298 ft
4 main spans
Daily traffic
2,820
2022 count
Owner
State
State Highway Agency

About this bridge

US 6 over W Nishnabotna River is a prestressed concrete stringer/multi-beam or girder carrying US 6 over W Nishnabotna River in Pottawattamie County, Iowa. It was built in 1985, so it is 40 years old, younger than the Iowa average of 45.5 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 2,820 vehicles a day, roughly 15% of them trucks, projected to reach 2,820 by 2042. The structure is 298 ft (90.8 m) long and 43 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesUS 6
CrossesW Nishnabotna River
Location0.5 Mi. W of W Jct. US 59
RouteU.S. Route 6
CountyPottawattamie County
StateIowa
Coordinates41.2891, -95.41335
Functional classRural Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 rating58.3 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length298 ft (90.8 m)
Longest span97 ft (29.6 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,820 (2022)
Projected traffic2,820 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

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 US 6 over W Nishnabotna River built?

It was built in 1985, making it 40 years old in 2025.

What condition is US 6 over W Nishnabotna 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 May 2023.

How much traffic does US 6 over W Nishnabotna River carry?

About 2,820 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is US 6 over W Nishnabotna River?

The structure is 298 ft (90.8 m) long with a longest span of 97 ft (29.6 m) and a deck 43 ft wide.

Who owns US 6 over W Nishnabotna River?

It is owned by the State Highway Agency.