US Bridges

NW 66th Ave over Des Moines River

Good

Polk County, Iowa · NW 66th over Des Moines · Structure no. 000000000281371

Built
2016
9 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
834 ft
8 main spans
Daily traffic
11,354
2022 count
Owner
County
County Highway Agency

About this bridge

NW 66th Ave over Des Moines River is a prestressed concrete stringer/multi-beam or girder carrying NW 66th Ave over Des Moines River in Polk County, Iowa. It was built in 2016, so it is 9 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 11,354 vehicles a day, projected to reach 11,354 by 2043. The structure is 834 ft (254.2 m) long and 70 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesNW 66th Ave
CrossesDes Moines River
LocationNW 66th over Des Moines
RouteCounty Highway 0
CountyPolk County
StateIowa
Coordinates41.68048, -93.67074
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHL 93
Structure length834 ft (254.2 m)
Longest span107 ft (32.6 m)
Deck width70 ft (21.3 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,354 (2022)
Projected traffic11,354 by 2043
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 NW 66th Ave over Des Moines River built?

It was built in 2016, making it 9 years old in 2025.

What condition is NW 66th Ave over Des Moines River 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 2023.

How much traffic does NW 66th Ave over Des Moines River carry?

About 11,354 vehicles per day (2022 count).

How long is NW 66th Ave over Des Moines River?

The structure is 834 ft (254.2 m) long with a longest span of 107 ft (32.6 m) and a deck 70 ft wide.

Who owns NW 66th Ave over Des Moines River?

It is owned by the County Highway Agency.