US Bridges

Hana HWY over Koukouai Strm

FairPosted for load

Maui County, Hawaii · 8.35MI W/Rd to Hamoa · Structure no. 009003600904058

Built
1911
114 years old
Condition
Fair
inspected January 2024
Type
Arch - Deck
Concrete
Length
54 ft
4 main spans
Daily traffic
450
1998 count
Owner
County
County Highway Agency

About this bridge

Hana HWY over Koukouai Strm is a concrete arch - deck carrying Hana HWY over Koukouai Strm in Maui County, Hawaii. It was built in 1911, so it is 114 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. Its operating status is: posted for load restriction.

It carries about 450 vehicles a day, projected to reach 563 by 2025. The structure is 54 ft (16.6 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesHana HWY
CrossesKoukouai Strm
Location8.35MI W/Rd to Hamoa
RouteCounty Highway 360
CountyMaui County
StateHawaii
Coordinates20.65105, -156.0603
Functional classRural Minor 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 protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating12.1 US tons
Inventory rating9.3 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length54 ft (16.6 m)
Longest span34 ft (10.5 m)
Deck width16 ft (5 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (1998)
Projected traffic563 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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$298,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Hana HWY over Koukouai Strm built?

It was built in 1911, making it 114 years old in 2025.

What condition is Hana HWY over Koukouai Strm 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 January 2024.

How much traffic does Hana HWY over Koukouai Strm carry?

About 450 vehicles per day (1998 count).

How long is Hana HWY over Koukouai Strm?

The structure is 54 ft (16.6 m) long with a longest span of 34 ft (10.5 m) and a deck 16 ft wide.

Who owns Hana HWY over Koukouai Strm?

It is owned by the County Highway Agency.