US Bridges

S 4th ST over Ioway Creek

Fair

Story County, Iowa · A14000675 · Structure no. 000000000000166

Built
1970
55 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
230 ft
3 main spans
Daily traffic
11,666
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

S 4th ST over Ioway Creek is a prestressed concrete stringer/multi-beam or girder carrying S 4th ST over Ioway Creek in Story County, Iowa. It was built in 1970, so it is 55 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 11,666 vehicles a day, projected to reach 11,666 by 2043. The structure is 230 ft (70.1 m) long and 59 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesS 4th ST
CrossesIoway Creek
LocationA14000675
RouteCity Street 0
CountyStory County
StateIowa
Coordinates42.0177, -93.62926
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.5 US tons
Inventory rating26.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length230 ft (70.1 m)
Longest span80 ft (24.4 m)
Deck width59 ft (17.9 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,666 (2022)
Projected traffic11,666 by 2043
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was S 4th ST over Ioway Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is S 4th ST over Ioway Creek 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 April 2024.

How much traffic does S 4th ST over Ioway Creek carry?

About 11,666 vehicles per day (2022 count).

How long is S 4th ST over Ioway Creek?

The structure is 230 ft (70.1 m) long with a longest span of 80 ft (24.4 m) and a deck 59 ft wide.

Who owns S 4th ST over Ioway Creek?

It is owned by the City or Municipal Highway Agency.