US Bridges

Prospect RD over Closes Creek

Fair

Polk County, Iowa · Prospect Rd. at Closes CR · Structure no. 000000000505080

Built
1984
41 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
42 ft
4 main spans
Daily traffic
2,245
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Prospect RD over Closes Creek is a concrete culvert carrying Prospect RD over Closes Creek in Polk County, Iowa. It was built in 1984, so it is 41 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 2,245 vehicles a day, projected to reach 2,245 by 2043. The structure is 42 ft (12.8 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesProspect RD
CrossesCloses Creek
LocationProspect Rd. at Closes CR
RouteCity Street 0
CountyPolk County
StateIowa
Coordinates41.61551, -93.63266
Functional classUrban 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadUnknown
Structure length42 ft (12.8 m)
Longest span7 ft (2.1 m)
Deck width24 ft (7.3 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,245 (2022)
Projected traffic2,245 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Prospect RD over Closes Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Prospect RD over Closes 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 July 2023.

How much traffic does Prospect RD over Closes Creek carry?

About 2,245 vehicles per day (2022 count).

How long is Prospect RD over Closes Creek?

The structure is 42 ft (12.8 m) long with a longest span of 7 ft (2.1 m) and a deck 24 ft wide.

Who owns Prospect RD over Closes Creek?

It is owned by the City or Municipal Highway Agency.