US Bridges

310th ST over Ballard Creek

FairPosted for load

Story County, Iowa · 082242001 · Structure no. 000000000314330

Built
1970
55 years old, rebuilt 1974
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
43 ft
1 main span
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

310th ST over Ballard Creek is a steel stringer/multi-beam or girder carrying 310th ST over Ballard Creek in Story County, Iowa. It was built in 1970 and reconstructed in 1974, so it is 55 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 50 by 2043. The structure is 43 ft (13.1 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries310th ST
CrossesBallard Creek
Location082242001
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.90706, -93.66901
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.1 US tons
Inventory rating17.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length43 ft (13.1 m)
Longest span42 ft (12.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic50 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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 310th ST over Ballard Creek built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1974.

What condition is 310th ST over Ballard 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 January 2023.

How much traffic does 310th ST over Ballard Creek carry?

About 50 vehicles per day (2022 count).

How long is 310th ST over Ballard Creek?

The structure is 43 ft (13.1 m) long with a longest span of 42 ft (12.8 m) and a deck 24 ft wide.

Who owns 310th ST over Ballard Creek?

It is owned by the County Highway Agency.