US Bridges

710th Ave over Drainage

FairPosted for load

Story County, Iowa · 083213402 · Structure no. 000000000314480

Built
1959
66 years old, rebuilt 2010
Condition
Fair
inspected December 2022
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
21 ft
1 main span
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

710th Ave over Drainage is a wood or timber stringer/multi-beam or girder carrying 710th Ave over Drainage in Story County, Iowa. It was built in 1959 and reconstructed in 2010, so it is 66 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 11 vehicles a day, projected to reach 11 by 2043. The structure is 21 ft (6.4 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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Carries710th Ave
CrossesDrainage
Location083213402
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.95436, -93.29002
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2022
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating20.9 US tons
Inventory rating14 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span19 ft (5.8 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-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 710th Ave over Drainage built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2010.

What condition is 710th Ave over Drainage 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 710th Ave over Drainage carry?

About 11 vehicles per day (2022 count).

How long is 710th Ave over Drainage?

The structure is 21 ft (6.4 m) long with a longest span of 19 ft (5.8 m) and a deck 24 ft wide.

Who owns 710th Ave over Drainage?

It is owned by the County Highway Agency.