US Bridges

R 38/510th Ave over Walnut Creek

Fair

Story County, Iowa · 083242902 · Structure no. 000000000314951

Built
2010
15 years old
Condition
Fair
inspected December 2022
Type
Culvert
Concrete Continuous
Length
30 ft
2 main spans
Daily traffic
4,647
2022 count
Owner
County
County Highway Agency

About this bridge

R 38/510th Ave over Walnut Creek is a concrete continuous culvert carrying R 38/510th Ave over Walnut Creek in Story County, Iowa. It was built in 2010, so it is 15 years old, younger 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 4,647 vehicles a day, roughly 5% of them trucks, projected to reach 4,647 by 2043. The structure is 30 ft (9 m) long.

Location

Open in Google Maps
CarriesR 38/510th Ave
CrossesWalnut Creek
Location083242902
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.97238, -93.67792
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 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
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.6 US tons
Inventory rating45.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length30 ft (9 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,647 (2022)
Projected traffic4,647 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was R 38/510th Ave over Walnut Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is R 38/510th Ave over Walnut 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 R 38/510th Ave over Walnut Creek carry?

About 4,647 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is R 38/510th Ave over Walnut Creek?

The structure is 30 ft (9 m) long with a longest span of 14 ft (4.3 m).

Who owns R 38/510th Ave over Walnut Creek?

It is owned by the County Highway Agency.