US Bridges

NW 158th Ave over Big Creek Tributary

Fair

Polk County, Iowa · 081250901 · Structure no. 000000000363460

Built
1991
34 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
152
2022 count
Owner
County
County Highway Agency

About this bridge

NW 158th Ave over Big Creek Tributary is a concrete continuous culvert carrying NW 158th Ave over Big Creek Tributary in Polk County, Iowa. It was built in 1991, so it is 34 years old, younger 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 152 vehicles a day, projected to reach 152 by 2042. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNW 158th Ave
CrossesBig Creek Tributary
Location081250901
RouteCounty Highway 0
CountyPolk County
StateIowa
Coordinates41.84954, -93.75721
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.5 US tons
Inventory rating54.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic152 (2022)
Projected traffic152 by 2042
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

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 NW 158th Ave over Big Creek Tributary built?

It was built in 1991, making it 34 years old in 2025.

What condition is NW 158th Ave over Big Creek Tributary 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 May 2023.

How much traffic does NW 158th Ave over Big Creek Tributary carry?

About 152 vehicles per day (2022 count).

How long is NW 158th Ave over Big Creek Tributary?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns NW 158th Ave over Big Creek Tributary?

It is owned by the County Highway Agency.