US Bridges

NB I-29 over Cc&p RR

Fair

Pottawattamie County, Iowa · 2.1 Mi. N of Jct. US 6 · Structure no. 000000000044850

Built
1968
57 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
378 ft
7 main spans
Daily traffic
5,400
2022 count
Owner
State
State Highway Agency

About this bridge

NB I-29 over Cc&p RR is a steel continuous stringer/multi-beam or girder carrying NB I-29 over Cc&p RR in Pottawattamie County, Iowa. It was built in 1968, so it is 57 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 5,400 vehicles a day, roughly 25% of them trucks, projected to reach 5,400 by 2043. The structure is 378 ft (115.2 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB I-29
CrossesCc&p RR
Location2.1 Mi. N of Jct. US 6
RouteInterstate 29
CountyPottawattamie County
StateIowa
Coordinates41.2754, -95.87785
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67.5 US tons
Inventory rating40.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length378 ft (115.2 m)
Longest span61 ft (18.6 m)
Deck width49 ft (14.9 m)
Roadway width45 ft (13.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,400 (2022)
Projected traffic5,400 by 2043
Trucks25%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 NB I-29 over Cc&p RR built?

It was built in 1968, making it 57 years old in 2025.

What condition is NB I-29 over Cc&p RR 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 2023.

How much traffic does NB I-29 over Cc&p RR carry?

About 5,400 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is NB I-29 over Cc&p RR?

The structure is 378 ft (115.2 m) long with a longest span of 61 ft (18.6 m) and a deck 49 ft wide.

Who owns NB I-29 over Cc&p RR?

It is owned by the State Highway Agency.