US Bridges

1st Ave over Ralston Creek S. Branch

Good

Johnson County, Iowa · 079061300 · Structure no. 000000000504420

Built
1997
28 years old
Condition
Good
inspected June 2023
Type
Culvert
Concrete Continuous
Length
37 ft
3 main spans
Daily traffic
14,992
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

1st Ave over Ralston Creek S. Branch is a concrete continuous culvert carrying 1st Ave over Ralston Creek S. Branch in Johnson County, Iowa. It was built in 1997, so it is 28 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 14,992 vehicles a day, projected to reach 14,992 by 2043. The structure is 37 ft (11.3 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries1st Ave
CrossesRalston Creek S. Branch
Location079061300
RouteCity Street 0
CountyJohnson County
StateIowa
Coordinates41.65167, -91.50199
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating22.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length37 ft (11.3 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 traffic14,992 (2022)
Projected traffic14,992 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 1st Ave over Ralston Creek S. Branch built?

It was built in 1997, making it 28 years old in 2025.

What condition is 1st Ave over Ralston Creek S. Branch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

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

About 14,992 vehicles per day (2022 count).

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

The structure is 37 ft (11.3 m) long with a longest span of 12 ft (3.7 m).

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

It is owned by the City or Municipal Highway Agency.