US Bridges

FM over Sm Stream

Good

Sioux County, Iowa · 097453504 · Structure no. 000000000312820

Built
1933
92 years old, rebuilt 1974
Condition
Good
inspected November 2022
Type
Culvert
Steel
Length
27 ft
2 main spans
Daily traffic
1,416
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Sm Stream is a steel culvert carrying FM over Sm Stream in Sioux County, Iowa. It was built in 1933 and reconstructed in 1974, so it is 92 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 1,416 vehicles a day, roughly 8% of them trucks, projected to reach 1,416 by 2043. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM
CrossesSm Stream
Location097453504
RouteCounty Highway 0
CountySioux County
StateIowa
Coordinates43.18213, -96.13764
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.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2022
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 rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,416 (2022)
Projected traffic1,416 by 2043
Trucks8%
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Sm Stream built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1974.

What condition is FM over Sm 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 November 2022.

How much traffic does FM over Sm Stream carry?

About 1,416 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is FM over Sm Stream?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m).

Who owns FM over Sm Stream?

It is owned by the County Highway Agency.