US Bridges

Kapule HWY over Hanamaulu River

Fair

Kauai County, Hawaii · .83 MI N of Ahukini RD · Structure no. 007000510200281

Built
1988
37 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
1,155 ft
7 main spans
Daily traffic
22,400
2017 count
Owner
State
State Highway Agency

About this bridge

Kapule HWY over Hanamaulu River is a concrete continuous box beam or girders - multiple carrying Kapule HWY over Hanamaulu River in Kauai County, Hawaii. It was built in 1988, so it is 37 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 22,400 vehicles a day, roughly 3% of them trucks, projected to reach 21,480 by 2025. The structure is 1,155 ft (352 m) long and 43 ft wide.

CarriesKapule HWY
CrossesHanamaulu River
Location.83 MI N of Ahukini RD
RouteU.S. Route 51
StateHawaii
Coordinates21.993, -159.34395
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating103.9 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7 (+2 approach)
Design loadHS 20
Structure length1,155 ft (352 m)
Longest span182 ft (55.5 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,400 (2017)
Projected traffic21,480 by 2025
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed—
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 Kapule HWY over Hanamaulu River built?

It was built in 1988, making it 37 years old in 2025.

What condition is Kapule HWY over Hanamaulu River 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 June 2023.

How much traffic does Kapule HWY over Hanamaulu River carry?

About 22,400 vehicles per day (2017 count), of which roughly 3% are trucks.

How long is Kapule HWY over Hanamaulu River?

The structure is 1,155 ft (352 m) long with a longest span of 182 ft (55.5 m) and a deck 43 ft wide.

Who owns Kapule HWY over Hanamaulu River?

It is owned by the State Highway Agency.