US Bridges

NW 150th Ave over Big Creek Tributary

Good

Polk County, Iowa · 081250903 · Structure no. 000000000283135

Built
1971
54 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
114 ft
3 main spans
Daily traffic
81
2022 count
Owner
County
County Highway Agency

About this bridge

NW 150th Ave over Big Creek Tributary is a steel continuous stringer/multi-beam or girder carrying NW 150th Ave over Big Creek Tributary in Polk County, Iowa. It was built in 1971, so it is 54 years old, older 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 81 vehicles a day, projected to reach 81 by 2042. The structure is 114 ft (34.7 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNW 150th Ave
CrossesBig Creek Tributary
Location081250903
RouteCounty Highway 0
CountyPolk County
StateIowa
Coordinates41.83634, -93.76004
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30.8 US tons
Inventory rating23.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length114 ft (34.7 m)
Longest span44 ft (13.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81 (2022)
Projected traffic81 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was NW 150th Ave over Big Creek Tributary built?

It was built in 1971, making it 54 years old in 2025.

What condition is NW 150th Ave over Big Creek Tributary 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 March 2023.

How much traffic does NW 150th Ave over Big Creek Tributary carry?

About 81 vehicles per day (2022 count).

How long is NW 150th Ave over Big Creek Tributary?

The structure is 114 ft (34.7 m) long with a longest span of 44 ft (13.4 m) and a deck 32 ft wide.

Who owns NW 150th Ave over Big Creek Tributary?

It is owned by the County Highway Agency.