US Bridges

1st Ave over Ralston Creek N. Branch

Fair

Johnson County, Iowa · 079061200 · Structure no. 000000000503885

Built
1984
41 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
7,143
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

1st Ave over Ralston Creek N. Branch is a concrete continuous culvert carrying 1st Ave over Ralston Creek N. Branch in Johnson 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 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 7,143 vehicles a day, projected to reach 7,143 by 2043. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 62.1 mi (100 km).

Location

Open in Google Maps
Carries1st Ave
CrossesRalston Creek N. Branch
Location079061200
RouteCity Street 0
CountyJohnson County
StateIowa
Coordinates41.67056, -91.50144
Functional classUrban Minor Arterial

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 protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,143 (2022)
Projected traffic7,143 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed62.1 mi (100 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 1st Ave over Ralston Creek N. Branch built?

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

What condition is 1st Ave over Ralston Creek N. 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 July 2023.

How much traffic does 1st Ave over Ralston Creek N. Branch carry?

About 7,143 vehicles per day (2022 count).

How long is 1st Ave over Ralston Creek N. Branch?

The structure is 28 ft (8.5 m) long with a longest span of 12 ft (3.7 m).

Who owns 1st Ave over Ralston Creek N. Branch?

It is owned by the City or Municipal Highway Agency.