US Bridges

170th ST (sdb) over Drainage

Good

Plymouth County, Iowa · 1.0 MI N of JCT Ia 3 · Structure no. 000000000274591

Built
2004
21 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
29 ft
1 main span
Daily traffic
469
2022 count
Owner
State
State Highway Agency

About this bridge

170th ST (sdb) over Drainage is a concrete culvert carrying 170th ST (sdb) over Drainage in Plymouth 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 469 vehicles a day, projected to reach 469 by 2044. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries170th ST (sdb)
CrossesDrainage
Location1.0 MI N of JCT Ia 3
RouteCounty Highway 0
CountyPlymouth County
StateIowa
Coordinates42.80768, -96.17527
Functional classUrban 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 inspectionFebruary 2024
Inspection intervalevery 24 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 alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span28 ft (8.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic469 (2022)
Projected traffic469 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 170th ST (sdb) over Drainage built?

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

What condition is 170th ST (sdb) over Drainage 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 February 2024.

How much traffic does 170th ST (sdb) over Drainage carry?

About 469 vehicles per day (2022 count).

How long is 170th ST (sdb) over Drainage?

The structure is 29 ft (8.8 m) long with a longest span of 28 ft (8.5 m).

Who owns 170th ST (sdb) over Drainage?

It is owned by the State Highway Agency.