US Bridges

South Expressway over Viaduct over RR & Street

Fair

Pottawattamie County, Iowa · S. Expressway NB · Structure no. 000000000609090

Built
1976
49 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
2,649 ft
6 main spans
Daily traffic
7,629
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

South Expressway over Viaduct over RR & Street is a steel continuous stringer/multi-beam or girder carrying South Expressway over Viaduct over RR & Street in Pottawattamie County, Iowa. It was built in 1976, so it is 49 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 7,629 vehicles a day, roughly 3% of them trucks, projected to reach 7,629 by 2044. The structure is 2,649 ft (807.4 m) long and 36 ft wide.

Location

Open in Google Maps
CarriesSouth Expressway
CrossesViaduct over RR & Street
LocationS. Expressway NB
RouteCity Street 0
CountyPottawattamie County
StateIowa
Coordinates41.2464, -95.85393
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.5 US tons
Inventory rating30.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6 (+29 approach)
Design loadHS 20
Structure length2,649 ft (807.4 m)
Longest span136 ft (41.5 m)
Deck width36 ft (10.9 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,629 (2022)
Projected traffic7,629 by 2044
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 South Expressway over Viaduct over RR & Street built?

It was built in 1976, making it 49 years old in 2025.

What condition is South Expressway over Viaduct over RR & Street 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 June 2024.

How much traffic does South Expressway over Viaduct over RR & Street carry?

About 7,629 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is South Expressway over Viaduct over RR & Street?

The structure is 2,649 ft (807.4 m) long with a longest span of 136 ft (41.5 m) and a deck 36 ft wide.

Who owns South Expressway over Viaduct over RR & Street?

It is owned by the City or Municipal Highway Agency.