US Bridges

170th ST over Drainage Ditch

Good

Des Moines County, Iowa · 071012901 · Structure no. 000000000143472

Built
2018
7 years old
Condition
Good
inspected September 2022
Type
Slab
Steel
Length
42 ft
1 main span
Daily traffic
47
2022 count
Owner
County
County Highway Agency

About this bridge

170th ST over Drainage Ditch is a steel slab carrying 170th ST over Drainage Ditch in Des Moines County, Iowa. It was built in 2018, so it is 7 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 47 vehicles a day, projected to reach 47 by 2043. The structure is 42 ft (12.8 m) long and 25 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
Carries170th ST
CrossesDrainage Ditch
Location071012901
RouteCounty Highway 0
CountyDes Moines County
StateIowa
Coordinates40.92778, -91.00118
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating70.8 US tons

Structure

Structure typeSlab
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length42 ft (12.8 m)
Longest span41 ft (12.5 m)
Deck width25 ft (7.6 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47 (2022)
Projected traffic47 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 2018, making it 7 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 2022.

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

About 47 vehicles per day (2022 count).

How long is 170th ST over Drainage Ditch?

The structure is 42 ft (12.8 m) long with a longest span of 41 ft (12.5 m) and a deck 25 ft wide.

Who owns 170th ST over Drainage Ditch?

It is owned by the County Highway Agency.