US Bridges

N64 over Small Natural Stream

Good

Taylor County, Iowa · 070322902 · Structure no. 000000000049941

Built
2004
21 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
927
2021 count
Owner
County
County Highway Agency

About this bridge

N64 over Small Natural Stream is a concrete continuous culvert carrying N64 over Small Natural Stream in Taylor County, Iowa. It was built in 2004, so it is 21 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 927 vehicles a day, roughly 15% of them trucks, projected to reach 927 by 2043. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 9.9 mi (16 km).

CarriesN64
CrossesSmall Natural Stream
Location070322902
RouteCounty Highway 0
StateIowa
Coordinates40.84144, -94.56621
Functional classRural Minor Arterial

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 inspectionMay 2023
Inspection intervalevery 48 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 alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 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 traffic927 (2021)
Projected traffic927 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N64 over Small Natural Stream built?

It was built in 2004, making it 21 years old in 2025.

What condition is N64 over Small Natural 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 May 2023.

How much traffic does N64 over Small Natural Stream carry?

About 927 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is N64 over Small Natural Stream?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns N64 over Small Natural Stream?

It is owned by the County Highway Agency.