US Bridges

Piilani HWY over Waiakoa Gulch

Fair

Maui County, Hawaii · 0.14MI Se/N Kihei RD · Structure no. 009000310300014

Built
2007
18 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
168 ft
2 main spans
Daily traffic
42,400
2017 count
Owner
State
State Highway Agency

About this bridge

Piilani HWY over Waiakoa Gulch is a prestressed concrete continuous stringer/multi-beam or girder carrying Piilani HWY over Waiakoa Gulch in Maui County, Hawaii. It was built in 2007, so it is 18 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 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 42,400 vehicles a day, projected to reach 40,100 by 2027. The structure is 168 ft (51.1 m) long and 83 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesPiilani HWY
CrossesWaiakoa Gulch
Location0.14MI Se/N Kihei RD
RouteU.S. Route 31
CountyMaui County
StateHawaii
Coordinates20.78444, -156.46028
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
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
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.2 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length168 ft (51.1 m)
Longest span81 ft (24.7 m)
Deck width83 ft (25.4 m)
Roadway width69 ft (21 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,400 (2017)
Projected traffic40,100 by 2027
Trucks0%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Piilani HWY over Waiakoa Gulch built?

It was built in 2007, making it 18 years old in 2025.

What condition is Piilani HWY over Waiakoa Gulch 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 February 2025.

How much traffic does Piilani HWY over Waiakoa Gulch carry?

About 42,400 vehicles per day (2017 count).

How long is Piilani HWY over Waiakoa Gulch?

The structure is 168 ft (51.1 m) long with a longest span of 81 ft (24.7 m) and a deck 83 ft wide.

Who owns Piilani HWY over Waiakoa Gulch?

It is owned by the State Highway Agency.