US Bridges

140th ST over Drainage Ditch

FairPosted for load

Story County, Iowa · 085242701 · Structure no. 000000000316435

Built
1963
62 years old, rebuilt 1974
Condition
Fair
inspected November 2022
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
20 ft
1 main span
Daily traffic
34
2022 count
Owner
County
County Highway Agency

About this bridge

140th ST over Drainage Ditch is a wood or timber stringer/multi-beam or girder carrying 140th ST over Drainage Ditch in Story County, Iowa. It was built in 1963 and reconstructed in 1974, so it is 62 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 6 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 34 vehicles a day, roughly 29% of them trucks, projected to reach 34 by 2043. The structure is 20 ft (6.1 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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Carries140th ST
CrossesDrainage Ditch
Location085242701
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates42.15181, -93.62447
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2022
Inspection intervalevery 24 months
Operating statusPosted for load 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 alignment8: Equal to present desirable criteria
Operating rating29 US tons
Inventory rating20 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length20 ft (6.1 m)
Longest span18 ft (5.5 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (2022)
Projected traffic34 by 2043
Trucks29%
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 140th ST over Drainage Ditch built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1974.

What condition is 140th ST over Drainage 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 November 2022.

How much traffic does 140th ST over Drainage Ditch carry?

About 34 vehicles per day (2022 count), of which roughly 29% are trucks.

How long is 140th ST over Drainage Ditch?

The structure is 20 ft (6.1 m) long with a longest span of 18 ft (5.5 m) and a deck 24 ft wide.

Who owns 140th ST over Drainage Ditch?

It is owned by the County Highway Agency.