US Bridges

K64 over Small Stream

Good

Sioux County, Iowa · 096440804 · Structure no. 000000000311341

Built
1984
41 years old
Condition
Good
inspected January 2023
Type
Slab
Concrete
Length
129 ft
3 main spans
Daily traffic
1,277
2022 count
Owner
County
County Highway Agency

About this bridge

K64 over Small Stream is a concrete slab carrying K64 over Small Stream in Sioux County, Iowa. It was built in 1984, so it is 41 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 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 1,277 vehicles a day, roughly 13% of them trucks, projected to reach 1,277 by 2043. The structure is 129 ft (39.3 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesK64
CrossesSmall Stream
Location096440804
RouteCounty Highway 0
CountySioux County
StateIowa
Coordinates43.15678, -96.059
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55.9 US tons
Inventory rating32.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length129 ft (39.3 m)
Longest span49 ft (14.9 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,277 (2022)
Projected traffic1,277 by 2043
Trucks13%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was K64 over Small Stream built?

It was built in 1984, making it 41 years old in 2025.

What condition is K64 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 January 2023.

How much traffic does K64 over Small Stream carry?

About 1,277 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is K64 over Small Stream?

The structure is 129 ft (39.3 m) long with a longest span of 49 ft (14.9 m) and a deck 32 ft wide.

Who owns K64 over Small Stream?

It is owned by the County Highway Agency.