US Bridges

Piihonua RD over Wailuku River

Fair

Hawaii County, Hawaii · Tmk 2-5-28:17 · Structure no. 001250001100001

Built
1976
49 years old
Condition
Fair
inspected December 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
63 ft
1 main span
Daily traffic
370
1986 count
Owner
County
County Highway Agency

About this bridge

Piihonua RD over Wailuku River is a prestressed concrete box beam or girders - multiple carrying Piihonua RD over Wailuku River in Hawaii County, Hawaii. It was built in 1976, so it is 49 years old, younger than the Hawaii average of 63.8 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 370 vehicles a day, projected to reach 463 by 2025. The structure is 63 ft (19.2 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesPiihonua RD
CrossesWailuku River
LocationTmk 2-5-28:17
RouteCity Street 25000
CountyHawaii County
StateHawaii
Coordinates19.71497, -155.13826
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.4 US tons
Inventory rating38.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span58 ft (17.8 m)
Deck width36 ft (11.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic370 (1986)
Projected traffic463 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed3.7 mi (6 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$354,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Piihonua RD over Wailuku River built?

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

What condition is Piihonua RD over Wailuku River 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 December 2023.

How much traffic does Piihonua RD over Wailuku River carry?

About 370 vehicles per day (1986 count).

How long is Piihonua RD over Wailuku River?

The structure is 63 ft (19.2 m) long with a longest span of 58 ft (17.8 m) and a deck 36 ft wide.

Who owns Piihonua RD over Wailuku River?

It is owned by the County Highway Agency.