US Bridges

170th ST over Prairie Creek

Good

Buchanan County, Iowa · 089070801 · Structure no. 000000000082471

Built
2014
11 years old
Condition
Good
inspected December 2024
Type
Other
Steel
Length
69 ft
1 main span
Daily traffic
44
2022 count
Owner
County
County Highway Agency

About this bridge

170th ST over Prairie Creek is a steel other carrying 170th ST over Prairie Creek in Buchanan County, Iowa. It was built in 2014, so it is 11 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 44 vehicles a day, projected to reach 44 by 2043. The structure is 69 ft (21 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries170th ST
CrossesPrairie Creek
Location089070801
RouteCounty Highway 0
CountyBuchanan County
StateIowa
Coordinates42.54118, -91.69078
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.5 US tons
Inventory rating20.3 US tons

Structure

Structure typeOther
MaterialSteel
DeckSteel plate
Main spans1
Design loadOther
Structure length69 ft (21 m)
Longest span68 ft (20.7 m)
Deck width27 ft (8.2 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44 (2022)
Projected traffic44 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 170th ST over Prairie Creek built?

It was built in 2014, making it 11 years old in 2025.

What condition is 170th ST over Prairie Creek 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 2024.

How much traffic does 170th ST over Prairie Creek carry?

About 44 vehicles per day (2022 count).

How long is 170th ST over Prairie Creek?

The structure is 69 ft (21 m) long with a longest span of 68 ft (20.7 m) and a deck 27 ft wide.

Who owns 170th ST over Prairie Creek?

It is owned by the County Highway Agency.