US Bridges

370th ST over Small Stream

Good

Sioux County, Iowa · 096433001 · Structure no. 000000000311192

Built
2012
13 years old
Condition
Good
inspected December 2022
Type
Culvert
Steel
Length
31 ft
2 main spans
Daily traffic
34
2022 count
Owner
County
County Highway Agency

About this bridge

370th ST over Small Stream is a steel culvert carrying 370th ST over Small Stream in Sioux County, Iowa. It was built in 2012, so it is 13 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 34 vehicles a day, projected to reach 34 by 2042. The structure is 31 ft (9.6 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries370th ST
CrossesSmall Stream
Location096433001
RouteCounty Highway 0
CountySioux County
StateIowa
Coordinates43.11319, -95.96079
Functional classRural Minor Collector

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 inspectionDecember 2022
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 spans2
Design loadHS 20
Structure length31 ft (9.6 m)
Longest span11 ft (3.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (2022)
Projected traffic34 by 2042
Trucks0%
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 370th ST over Small Stream built?

It was built in 2012, making it 13 years old in 2025.

What condition is 370th 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 December 2022.

How much traffic does 370th ST over Small Stream carry?

About 34 vehicles per day (2022 count).

How long is 370th ST over Small Stream?

The structure is 31 ft (9.6 m) long with a longest span of 11 ft (3.5 m).

Who owns 370th ST over Small Stream?

It is owned by the County Highway Agency.