US Bridges

Halfmoon Ave over Buffalo Creek

Fair

Johnson County, Iowa · 080072908 · Structure no. 000000000205041

Built
1976
49 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
112
2021 count
Owner
County
County Highway Agency

About this bridge

Halfmoon Ave over Buffalo Creek is a prestressed concrete stringer/multi-beam or girder carrying Halfmoon Ave over Buffalo Creek in Johnson County, Iowa. It was built in 1976, so it is 49 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 112 vehicles a day, projected to reach 112 by 2043. The structure is 45 ft (13.7 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesHalfmoon Ave
CrossesBuffalo Creek
Location080072908
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.71627, -91.68592
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating29.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span42 ft (12.8 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic112 (2021)
Projected traffic112 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Halfmoon Ave over Buffalo Creek built?

It was built in 1976, making it 49 years old in 2025.

What condition is Halfmoon Ave over Buffalo Creek 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 April 2023.

How much traffic does Halfmoon Ave over Buffalo Creek carry?

About 112 vehicles per day (2021 count).

How long is Halfmoon Ave over Buffalo Creek?

The structure is 45 ft (13.7 m) long with a longest span of 42 ft (12.8 m) and a deck 26 ft wide.

Who owns Halfmoon Ave over Buffalo Creek?

It is owned by the County Highway Agency.