US Bridges

170th ST over Small Stream

Good

Buchanan County, Iowa · 1089076000 · Structure no. 000000000366900

Built
2023
2 years old
Condition
Good
inspected December 2023
Type
Channel Beam
Concrete
Length
32 ft
1 main span
Daily traffic
69
2022 count
Owner
County
County Highway Agency

About this bridge

170th ST over Small Stream is a concrete channel beam carrying 170th ST over Small Stream in Buchanan County, Iowa. It was built in 2023, so it is 2 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 69 vehicles a day, projected to reach 69 by 2043. The structure is 32 ft (9.8 m) long and 30 ft wide.

Location

Open in Google Maps
Carries170th ST
CrossesSmall Stream
Location1089076000
RouteCounty Highway 0
CountyBuchanan County
StateIowa
Coordinates42.54149, -91.6565
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length32 ft (9.8 m)
Longest span32 ft (9.8 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic69 (2022)
Projected traffic69 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 170th ST over Small Stream built?

It was built in 2023, making it 2 years old in 2025.

What condition is 170th 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 2023.

How much traffic does 170th ST over Small Stream carry?

About 69 vehicles per day (2022 count).

How long is 170th ST over Small Stream?

The structure is 32 ft (9.8 m) long with a longest span of 32 ft (9.8 m) and a deck 30 ft wide.

Who owns 170th ST over Small Stream?

It is owned by the County Highway Agency.