US Bridges

610th Ave over Grant 5 Open Ditch

Fair

Story County, Iowa · 083232402 · Structure no. 000000000314740

Built
1941
84 years old, rebuilt 1981
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
31 ft
2 main spans
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

610th Ave over Grant 5 Open Ditch is a wood or timber stringer/multi-beam or girder carrying 610th Ave over Grant 5 Open Ditch in Story County, Iowa. It was built in 1941 and reconstructed in 1981, so it is 84 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.

It carries about 50 vehicles a day, projected to reach 50 by 2042. The structure is 31 ft (9.4 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries610th Ave
CrossesGrant 5 Open Ditch
Location083232402
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.98244, -93.48234
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.
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 statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating34.9 US tons
Inventory rating24.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span16 ft (4.9 m)
Deck width28 ft (8.4 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic50 by 2042
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 610th Ave over Grant 5 Open Ditch built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1981.

What condition is 610th Ave over Grant 5 Open Ditch 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 610th Ave over Grant 5 Open Ditch carry?

About 50 vehicles per day (2022 count).

How long is 610th Ave over Grant 5 Open Ditch?

The structure is 31 ft (9.4 m) long with a longest span of 16 ft (4.9 m) and a deck 28 ft wide.

Who owns 610th Ave over Grant 5 Open Ditch?

It is owned by the County Highway Agency.