US Bridges

R38 500th Ave over Clear Creek

Fair

Story County, Iowa · 084243106 · Structure no. 000000000315650

Built
1969
56 years old
Condition
Fair
inspected December 2022
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
2,712
2022 count
Owner
County
County Highway Agency

About this bridge

R38 500th Ave over Clear Creek is a concrete continuous culvert carrying R38 500th Ave over Clear Creek in Story County, Iowa. It was built in 1969, so it is 56 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 2,712 vehicles a day, projected to reach 2,712 by 2043. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesR38 500th Ave
CrossesClear Creek
Location084243106
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates42.03797, -93.69876
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating65.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,712 (2022)
Projected traffic2,712 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Clear Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is R38 500th Ave over Clear 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 Clear Creek carry?

About 2,712 vehicles per day (2022 count).

How long is R38 500th Ave over Clear Creek?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m).

Who owns R38 500th Ave over Clear Creek?

It is owned by the County Highway Agency.