US Bridges

12th Ave over I-80

Fair

Johnson County, Iowa · 3.0 Mi. E of JCT I-380 · Structure no. 000000000032050

Built
1962
63 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
226 ft
4 main spans
Daily traffic
10,192
2022 count
Owner
State
State Highway Agency

About this bridge

12th Ave over I-80 is a prestressed concrete stringer/multi-beam or girder carrying 12th Ave over I-80 in Johnson County, Iowa. It was built in 1962, so it is 63 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 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 10,192 vehicles a day, projected to reach 10,192 by 2044. The structure is 226 ft (68.9 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries12th Ave
CrossesI-80
Location3.0 Mi. E of JCT I-380
RouteCity Street 0
CountyJohnson County
StateIowa
Coordinates41.68877, -91.58182
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.4 US tons
Inventory rating32.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length226 ft (68.9 m)
Longest span68 ft (20.7 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,192 (2022)
Projected traffic10,192 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was 12th Ave over I-80 built?

It was built in 1962, making it 63 years old in 2025.

What condition is 12th Ave over I-80 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 2024.

How much traffic does 12th Ave over I-80 carry?

About 10,192 vehicles per day (2022 count).

How long is 12th Ave over I-80?

The structure is 226 ft (68.9 m) long with a longest span of 68 ft (20.7 m) and a deck 29 ft wide.

Who owns 12th Ave over I-80?

It is owned by the State Highway Agency.