US Bridges

I 29 NB over I 880

Fair

Pottawattamie County, Iowa · At N Jct. I-880 · Structure no. 000000000045040

Built
1966
59 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
210 ft
4 main spans
Daily traffic
9,750
2022 count
Owner
State
State Highway Agency

About this bridge

I 29 NB over I 880 is a prestressed concrete stringer/multi-beam or girder carrying I 29 NB over I 880 in Pottawattamie County, Iowa. It was built in 1966, so it is 59 years old, older 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 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 9,750 vehicles a day, roughly 25% of them trucks, projected to reach 9,750 by 2042. The structure is 210 ft (64 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 29 NB
CrossesI 880
LocationAt N Jct. I-880
RouteInterstate 29
CountyPottawattamie County
StateIowa
Coordinates41.49373, -95.90101
Functional classRural Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating83.2 US tons
Inventory rating28.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length210 ft (64 m)
Longest span69 ft (21 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,750 (2022)
Projected traffic9,750 by 2042
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 29 NB over I 880 built?

It was built in 1966, making it 59 years old in 2025.

What condition is I 29 NB over I 880 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 I 29 NB over I 880 carry?

About 9,750 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is I 29 NB over I 880?

The structure is 210 ft (64 m) long with a longest span of 69 ft (21 m) and a deck 42 ft wide.

Who owns I 29 NB over I 880?

It is owned by the State Highway Agency.