US Bridges

Kal HWY over Wawamalu Canal

Fair

Honolulu County, Hawaii · 0.72MI S/Makapuu Lt Hs RD · Structure no. 003074001400058

Built
1972
53 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
10,000
2017 count
Owner
State
State Highway Agency

About this bridge

Kal HWY over Wawamalu Canal is a prestressed concrete stringer/multi-beam or girder carrying Kal HWY over Wawamalu Canal in Honolulu County, Hawaii. It was built in 1972, so it is 53 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 10,000 vehicles a day, roughly 4% of them trucks, projected to reach 11,340 by 2025. The structure is 62 ft (18.9 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKal HWY
CrossesWawamalu Canal
Location0.72MI S/Makapuu Lt Hs RD
RouteU.S. Route 72
CountyHonolulu County
StateHawaii
Coordinates21.29722, -157.66254
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.7 US tons
Inventory rating42.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span60 ft (18.3 m)
Deck width51 ft (15.6 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2017)
Projected traffic11,340 by 2025
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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 Kal HWY over Wawamalu Canal built?

It was built in 1972, making it 53 years old in 2025.

What condition is Kal HWY over Wawamalu Canal 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 September 2024.

How much traffic does Kal HWY over Wawamalu Canal carry?

About 10,000 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is Kal HWY over Wawamalu Canal?

The structure is 62 ft (18.9 m) long with a longest span of 60 ft (18.3 m) and a deck 51 ft wide.

Who owns Kal HWY over Wawamalu Canal?

It is owned by the State Highway Agency.