US Bridges

380th ST over Small Stream

Good

Sioux County, Iowa · 096453101 · Structure no. 000000000311752

Built
2000
25 years old
Condition
Good
inspected February 2024
Type
Culvert
Steel
Length
44 ft
3 main spans
Daily traffic
359
2022 count
Owner
County
County Highway Agency

About this bridge

380th ST over Small Stream is a steel culvert carrying 380th ST over Small Stream in Sioux County, Iowa. It was built in 2000, so it is 25 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 359 vehicles a day, roughly 27% of them trucks, projected to reach 359 by 2044. The structure is 44 ft (13.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Carries380th ST
CrossesSmall Stream
Location096453101
RouteCounty Highway 0
StateIowa
Coordinates43.09879, -96.2045
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 spans3
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic359 (2022)
Projected traffic359 by 2044
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 380th ST over Small Stream built?

It was built in 2000, making it 25 years old in 2025.

What condition is 380th ST over Small Stream in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does 380th ST over Small Stream carry?

About 359 vehicles per day (2022 count), of which roughly 27% are trucks.

How long is 380th ST over Small Stream?

The structure is 44 ft (13.4 m) long with a longest span of 16 ft (4.9 m).

Who owns 380th ST over Small Stream?

It is owned by the County Highway Agency.