US Bridges

Sixth Ave over Ralston Creek S. Branch

Fair

Johnson County, Iowa · 079061400 · Structure no. 000000000006510

Built
1930
95 years old, rebuilt 1961
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
35 ft
2 main spans
Daily traffic
133
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sixth Ave over Ralston Creek S. Branch is a concrete continuous culvert carrying Sixth Ave over Ralston Creek S. Branch in Johnson County, Iowa. It was built in 1930 and reconstructed in 1961, so it is 95 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 133 vehicles a day, projected to reach 133 by 2043. The structure is 35 ft (10.7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSixth Ave
CrossesRalston Creek S. Branch
Location079061400
RouteCity Street 0
CountyJohnson County
StateIowa
Coordinates41.65011, -91.50951
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 inspectionJune 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 rating25.6 US tons
Inventory rating18.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span17 ft (5.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic133 (2022)
Projected traffic133 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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$330,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Sixth Ave over Ralston Creek S. Branch built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1961.

What condition is Sixth Ave over Ralston Creek S. Branch 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 June 2023.

How much traffic does Sixth Ave over Ralston Creek S. Branch carry?

About 133 vehicles per day (2022 count).

How long is Sixth Ave over Ralston Creek S. Branch?

The structure is 35 ft (10.7 m) long with a longest span of 17 ft (5.2 m).

Who owns Sixth Ave over Ralston Creek S. Branch?

It is owned by the City or Municipal Highway Agency.