US Bridges

NE 6th ST over Four Mile Creek Tributar

Fair

Polk County, Iowa · 081243504 · Structure no. 000000000283005

Built
1975
50 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

NE 6th ST over Four Mile Creek Tributar is a concrete continuous culvert carrying NE 6th ST over Four Mile Creek Tributar in Polk County, Iowa. It was built in 1975, so it is 50 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 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 15 vehicles a day, projected to reach 15 by 2042. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNE 6th ST
CrossesFour Mile Creek Tributar
Location081243504
RouteCounty Highway 0
CountyPolk County
StateIowa
Coordinates41.78984, -93.6101
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
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating35.3 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length22 ft (6.7 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 traffic15 (2022)
Projected traffic15 by 2042
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

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 NE 6th ST over Four Mile Creek Tributar built?

It was built in 1975, making it 50 years old in 2025.

What condition is NE 6th ST over Four Mile Creek Tributar 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 NE 6th ST over Four Mile Creek Tributar carry?

About 15 vehicles per day (2022 count).

How long is NE 6th ST over Four Mile Creek Tributar?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns NE 6th ST over Four Mile Creek Tributar?

It is owned by the County Highway Agency.