US Bridges

R70/580th Ave over Ballard Creek

Good

Story County, Iowa · 082231604 · Structure no. 000000000314111

Built
1989
36 years old
Condition
Good
inspected January 2023
Type
Slab
Concrete Continuous
Length
154 ft
3 main spans
Daily traffic
820
2023 count
Owner
County
County Highway Agency

About this bridge

R70/580th Ave over Ballard Creek is a concrete continuous slab carrying R70/580th Ave over Ballard Creek in Story County, Iowa. It was built in 1989, so it is 36 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 820 vehicles a day, projected to reach 820 by 2043. The structure is 154 ft (46.9 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesR70/580th Ave
CrossesBallard Creek
Location082231604
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.90808, -93.54077
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length154 ft (46.9 m)
Longest span57 ft (17.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic820 (2023)
Projected traffic820 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 R70/580th Ave over Ballard Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is R70/580th Ave over Ballard Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2023.

How much traffic does R70/580th Ave over Ballard Creek carry?

About 820 vehicles per day (2023 count).

How long is R70/580th Ave over Ballard Creek?

The structure is 154 ft (46.9 m) long with a longest span of 57 ft (17.4 m) and a deck 32 ft wide.

Who owns R70/580th Ave over Ballard Creek?

It is owned by the County Highway Agency.