US Bridges

170th ST over Drainage Ditch

Good

Hamilton County, Iowa · 089230801 · Structure no. 000000000172091

Built
2012
13 years old
Condition
Good
inspected September 2024
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

170th ST over Drainage Ditch is a concrete culvert carrying 170th ST over Drainage Ditch in Hamilton County, Iowa. It was built in 2012, so it is 13 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 11 vehicles a day, projected to reach 11 by 2044. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries170th ST
CrossesDrainage Ditch
Location089230801
RouteCounty Highway 0
CountyHamilton County
StateIowa
Coordinates42.54361, -93.58969
Functional classRural Local

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 inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
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 traffic11 (2022)
Projected traffic11 by 2044
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 170th ST over Drainage Ditch built?

It was built in 2012, making it 13 years old in 2025.

What condition is 170th ST over Drainage Ditch 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 September 2024.

How much traffic does 170th ST over Drainage Ditch carry?

About 11 vehicles per day (2022 count).

How long is 170th ST over Drainage Ditch?

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

Who owns 170th ST over Drainage Ditch?

It is owned by the County Highway Agency.