US Bridges

280th ST over Small

Fair

Sioux County, Iowa · 097440801 · Structure no. 000000000365035

Built
1978
47 years old
Condition
Fair
inspected December 2022
Type
Culvert
Steel
Length
33 ft
2 main spans
Daily traffic
45
2022 count
Owner
County
County Highway Agency

About this bridge

280th ST over Small is a steel culvert carrying 280th ST over Small in Sioux County, Iowa. It was built in 1978, so it is 47 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.

It carries about 45 vehicles a day, projected to reach 45 by 2042. The structure is 33 ft (10.1 m) long.

Carries280th ST
CrossesSmall
Location097440801
RouteCounty Highway 0
StateIowa
Coordinates43.24434, -96.06388
Functional classRural Minor Collector

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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2022)
Projected traffic45 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 280th ST over Small built?

It was built in 1978, making it 47 years old in 2025.

What condition is 280th ST over Small 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 280th ST over Small carry?

About 45 vehicles per day (2022 count).

How long is 280th ST over Small?

The structure is 33 ft (10.1 m) long with a longest span of 11 ft (3.4 m).

Who owns 280th ST over Small?

It is owned by the County Highway Agency.