US Bridges

Kapaa Bypass Road over Kainahola Stream

Fair

Kauai County, Hawaii · 1.6 MI N of Kuhio HWY · Structure no. 007056000400161

Built
1937
88 years old, rebuilt 2011
Condition
Fair
inspected May 2023
Type
Slab
Concrete
Length
56 ft
1 main span
Daily traffic
105
2007 count
Owner
State
State Highway Agency

About this bridge

Kapaa Bypass Road over Kainahola Stream is a concrete slab carrying Kapaa Bypass Road over Kainahola Stream in Kauai County, Hawaii. It was built in 1937 and reconstructed in 2011, so it is 88 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 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 105 vehicles a day, roughly 1% of them trucks, projected to reach 140 by 2027. The structure is 56 ft (17.1 m) long and 25 ft wide.

Location

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CarriesKapaa Bypass Road
CrossesKainahola Stream
Location1.6 MI N of Kuhio HWY
RouteU.S. Route 5600
CountyKauai County
StateHawaii
Coordinates22.07239, -159.32986
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.8 US tons
Inventory rating60 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span48 ft (14.7 m)
Deck width25 ft (7.6 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic105 (2007)
Projected traffic140 by 2027
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Kapaa Bypass Road over Kainahola Stream built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 2011.

What condition is Kapaa Bypass Road over Kainahola 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 May 2023.

How much traffic does Kapaa Bypass Road over Kainahola Stream carry?

About 105 vehicles per day (2007 count), of which roughly 1% are trucks.

How long is Kapaa Bypass Road over Kainahola Stream?

The structure is 56 ft (17.1 m) long with a longest span of 48 ft (14.7 m) and a deck 25 ft wide.

Who owns Kapaa Bypass Road over Kainahola Stream?

It is owned by the State Highway Agency.