US Bridges

NW 146th Ave over Turkey Creek

FairPosted for load

Polk County, Iowa · 0.2 Mi. E of Old Ia 415 · Structure no. 000000000283200

Built
1937
88 years old, rebuilt 2001
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
92 ft
5 main spans
Daily traffic
71
2022 count
Owner
County
County Highway Agency

About this bridge

NW 146th Ave over Turkey Creek is a wood or timber stringer/multi-beam or girder carrying NW 146th Ave over Turkey Creek in Polk County, Iowa. It was built in 1937 and reconstructed in 2001, so it is 88 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 71 vehicles a day, projected to reach 71 by 2043. The structure is 92 ft (28 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesNW 146th Ave
CrossesTurkey Creek
Location0.2 Mi. E of Old Ia 415
RouteCounty Highway 0
CountyPolk County
StateIowa
Coordinates41.82763, -93.77293
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating25.9 US tons
Inventory rating16.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans5
Design loadUnknown
Structure length92 ft (28 m)
Longest span18 ft (5.5 m)
Deck width22 ft (6.7 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2022)
Projected traffic71 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was NW 146th Ave over Turkey Creek built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 2001.

What condition is NW 146th Ave over Turkey Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.

How much traffic does NW 146th Ave over Turkey Creek carry?

About 71 vehicles per day (2022 count).

How long is NW 146th Ave over Turkey Creek?

The structure is 92 ft (28 m) long with a longest span of 18 ft (5.5 m) and a deck 22 ft wide.

Who owns NW 146th Ave over Turkey Creek?

It is owned by the County Highway Agency.