US Bridges

675th Ave over Rock Creek

PoorClosed to traffic

Story County, Iowa · 082221304 · Structure no. 000000000313730

Built
1911
114 years old
Condition
Poor
inspected January 2023
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

675th Ave over Rock Creek is a concrete culvert carrying 675th Ave over Rock Creek in Story County, Iowa. It was built in 1911, so it is 114 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: closed to all traffic.

It carries about 20 vehicles a day, projected to reach 20 by 2043. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries675th Ave
CrossesRock Creek
Location082221304
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.92102, -93.35754
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour above top of footing
Structural evaluation0: Immediate repair necessary to put back in service
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 675th Ave over Rock Creek built?

It was built in 1911, making it 114 years old in 2025.

What condition is 675th Ave over Rock Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2023.

How much traffic does 675th Ave over Rock Creek carry?

About 20 vehicles per day (2022 count).

How long is 675th Ave over Rock Creek?

The structure is 24 ft (7.3 m) long with a longest span of 20 ft (6.1 m).

Who owns 675th Ave over Rock Creek?

It is owned by the County Highway Agency.