US Bridges

315th ST over Drainage Ditch

Fair

Story County, Iowa · 082232209 · Structure no. 000000000314195

Built
1964
61 years old
Condition
Fair
inspected January 2023
Type
Culvert
Steel
Length
44 ft
2 main spans
Daily traffic
30
2022 count
Owner
County
County Highway Agency

About this bridge

315th ST over Drainage Ditch is a steel culvert carrying 315th ST over Drainage Ditch in Story County, Iowa. It was built in 1964, so it is 61 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 30 vehicles a day, projected to reach 30 by 2043. The structure is 44 ft (13.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries315th ST
CrossesDrainage Ditch
Location082232209
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.89933, -93.50741
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating31 US tons
Inventory rating22 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length44 ft (13.4 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2022)
Projected traffic30 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 315th ST over Drainage Ditch built?

It was built in 1964, making it 61 years old in 2025.

What condition is 315th 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 January 2023.

How much traffic does 315th ST over Drainage Ditch carry?

About 30 vehicles per day (2022 count).

How long is 315th ST over Drainage Ditch?

The structure is 44 ft (13.4 m) long with a longest span of 13 ft (4 m).

Who owns 315th ST over Drainage Ditch?

It is owned by the County Highway Agency.