US Bridges

Wainuaku Street over Kalalau Stream

Fair

Hawaii County, Hawaii · Tmk 2-6-006:022 · Structure no. 001260001100002

Built
1920
105 years old
Condition
Fair
inspected September 2023
Type
Arch - Deck
Masonry
Length
64 ft
1 main span
Daily traffic
3,020
1986 count
Owner
County
County Highway Agency

About this bridge

Wainuaku Street over Kalalau Stream is a masonry arch - deck carrying Wainuaku Street over Kalalau Stream in Hawaii County, Hawaii. It was built in 1920, so it is 105 years old, older 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 3,020 vehicles a day, projected to reach 3,775 by 2025. The structure is 64 ft (19.5 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesWainuaku Street
CrossesKalalau Stream
LocationTmk 2-6-006:022
CountyHawaii County
StateHawaii
Coordinates19.73437, -155.09309
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
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 inspectionSeptember 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.2 US tons
Inventory rating20 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length64 ft (19.5 m)
Longest span21 ft (6.4 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,020 (1986)
Projected traffic3,775 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$334,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Wainuaku Street over Kalalau Stream built?

It was built in 1920, making it 105 years old in 2025.

What condition is Wainuaku Street over Kalalau Stream 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 2023.

How much traffic does Wainuaku Street over Kalalau Stream carry?

About 3,020 vehicles per day (1986 count).

How long is Wainuaku Street over Kalalau Stream?

The structure is 64 ft (19.5 m) long with a longest span of 21 ft (6.4 m) and a deck 33 ft wide.

Who owns Wainuaku Street over Kalalau Stream?

It is owned by the County Highway Agency.