US Bridges

NW 114th ST over Walnut Creek

Fair

Polk County, Iowa · 079253300 · Structure no. 000000000002401

Built
1988
37 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
332 ft
4 main spans
Daily traffic
5,534
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

NW 114th ST over Walnut Creek is a prestressed concrete stringer/multi-beam or girder carrying NW 114th ST over Walnut Creek in Polk County, Iowa. It was built in 1988, so it is 37 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 5 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 5,534 vehicles a day, projected to reach 5,534 by 2043. The structure is 332 ft (101.1 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNW 114th ST
CrossesWalnut Creek
Location079253300
RouteCity Street 0
CountyPolk County
StateIowa
Coordinates41.61006, -93.77496
Functional classUrban 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
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating65.6 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length332 ft (101.1 m)
Longest span81 ft (24.8 m)
Deck width38 ft (11.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,534 (2021)
Projected traffic5,534 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 114th ST over Walnut Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is NW 114th ST over Walnut 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 May 2023.

How much traffic does NW 114th ST over Walnut Creek carry?

About 5,534 vehicles per day (2021 count).

How long is NW 114th ST over Walnut Creek?

The structure is 332 ft (101.1 m) long with a longest span of 81 ft (24.8 m) and a deck 38 ft wide.

Who owns NW 114th ST over Walnut Creek?

It is owned by the City or Municipal Highway Agency.