L22 over Small Stream

Good

Sioux County, Iowa · 094430202 · Structure no. 000000000308125

Built: 1955; 70 years old
Condition: Good; inspected April 2023
Type: Culvert; Concrete
Length: 20 ft; 2 main spans
Daily traffic: 366; 2021 count
Owner: County; County Highway Agency

About this bridge

L22 over Small Stream is a concrete culvert carrying L22 over Small Stream in Sioux County, Iowa. It was built in 1955, so it is 70 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 366 vehicles a day, roughly 17% of them trucks, projected to reach 366 by 2043. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesL22

CrossesSmall Stream

Location094430202

RouteCounty Highway 0

CountySioux County

StateIowa

Coordinates42.98403, -95.89921

Functional classRural Major Collector

Condition and inspection

Good

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

Component	Rating	Meaning
Channel and channel protection	8 Very Good	No problems noted.
Culvert	7 Good	Some minor problems.

Last inspectionApril 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating49.3 US tons

Inventory rating37.8 US tons

Structure

Structure typeCulvert

MaterialConcrete

DeckNot applicable

Main spans2

Design loadHS 20

Structure length20 ft (6.1 m)

Longest span10 ft (3 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic366 (2021)

Projected traffic366 by 2043

Trucks17%

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 L22 over Small Stream built?

It was built in 1955, making it 70 years old in 2025.

What condition is L22 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 April 2023.

How much traffic does L22 over Small Stream carry?

About 366 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is L22 over Small Stream?

The structure is 20 ft (6.1 m) long with a longest span of 10 ft (3 m).

Who owns L22 over Small Stream?

It is owned by the County Highway Agency.