US Bridges

R38/500th Ave over Ioway Creek

Fair

Story County, Iowa · 084240702 · Structure no. 000000000315521

Built
1976
49 years old
Condition
Fair
inspected December 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
200 ft
3 main spans
Daily traffic
1,496
2022 count
Owner
County
County Highway Agency

About this bridge

R38/500th Ave over Ioway Creek is a steel continuous stringer/multi-beam or girder carrying R38/500th Ave over Ioway Creek in Story 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 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 1,496 vehicles a day, roughly 6% of them trucks, projected to reach 1,496 by 2043. The structure is 200 ft (61 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesR38/500th Ave
CrossesIoway Creek
Location084240702
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates42.09978, -93.69868
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating36.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length200 ft (61 m)
Longest span78 ft (23.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,496 (2022)
Projected traffic1,496 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 R38/500th Ave over Ioway Creek built?

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

What condition is R38/500th Ave 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 December 2022.

How much traffic does R38/500th Ave over Ioway Creek carry?

About 1,496 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is R38/500th Ave over Ioway Creek?

The structure is 200 ft (61 m) long with a longest span of 78 ft (23.8 m) and a deck 32 ft wide.

Who owns R38/500th Ave over Ioway Creek?

It is owned by the County Highway Agency.