US Bridges

SB I-29 over Over Cc RR

Fair

Pottawattamie County, Iowa · 2.1 Mi. N of Jct. 6 · Structure no. 000000000044860

Built
1968
57 years old, rebuilt 2023
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
468 ft
7 main spans
Daily traffic
5,800
2022 count
Owner
State
State Highway Agency

About this bridge

SB I-29 over Over Cc RR is a steel continuous stringer/multi-beam or girder carrying SB I-29 over Over Cc RR in Pottawattamie County, Iowa. It was built in 1968 and reconstructed in 2023, 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 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 5,800 vehicles a day, roughly 24% of them trucks, projected to reach 5,800 by 2043. The structure is 468 ft (142.6 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSB I-29
CrossesOver Cc RR
Location2.1 Mi. N of Jct. 6
RouteInterstate 29
CountyPottawattamie County
StateIowa
Coordinates41.27623, -95.87675
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.1 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length468 ft (142.6 m)
Longest span79 ft (24.1 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,800 (2022)
Projected traffic5,800 by 2043
Trucks24%
Lanes on structure2
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 SB I-29 over Over Cc RR built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2023.

What condition is SB I-29 over Over Cc 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 SB I-29 over Over Cc RR carry?

About 5,800 vehicles per day (2022 count), of which roughly 24% are trucks.

How long is SB I-29 over Over Cc RR?

The structure is 468 ft (142.6 m) long with a longest span of 79 ft (24.1 m) and a deck 44 ft wide.

Who owns SB I-29 over Over Cc RR?

It is owned by the State Highway Agency.