US Bridges

Half Moon Ave over I-80

Good

Johnson County, Iowa · 2.8 Mi. W of Jct. I-380 · Structure no. 000000000031960

Built
1963
62 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
217 ft
4 main spans
Daily traffic
410
2022 count
Owner
State
State Highway Agency

About this bridge

Half Moon Ave over I-80 is a prestressed concrete stringer/multi-beam or girder carrying Half Moon Ave over I-80 in Johnson County, Iowa. It was built in 1963, so it is 62 years old, older 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 410 vehicles a day, projected to reach 410 by 2044. The structure is 217 ft (66.1 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesHalf Moon Ave
CrossesI-80
Location2.8 Mi. W of Jct. I-380
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.69426, -91.6907
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionJune 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.3 US tons
Inventory rating20.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length217 ft (66.1 m)
Longest span65 ft (19.8 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic410 (2022)
Projected traffic410 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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 Half Moon Ave over I-80 built?

It was built in 1963, making it 62 years old in 2025.

What condition is Half Moon Ave over I-80 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 2024.

How much traffic does Half Moon Ave over I-80 carry?

About 410 vehicles per day (2022 count).

How long is Half Moon Ave over I-80?

The structure is 217 ft (66.1 m) long with a longest span of 65 ft (19.8 m) and a deck 28 ft wide.

Who owns Half Moon Ave over I-80?

It is owned by the State Highway Agency.