US Bridges

Kaumualii HWY over Waimea River

Fair

Kauai County, Hawaii · 0.05MI Se/Ala Wai RD · Structure no. 007000500301039

Built
1940
85 years old, rebuilt 1967
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete Continuous
Length
365 ft
4 main spans
Daily traffic
11,300
2017 count
Owner
State
State Highway Agency

About this bridge

Kaumualii HWY over Waimea River is a concrete continuous tee beam carrying Kaumualii HWY over Waimea River in Kauai County, Hawaii. It was built in 1940 and reconstructed in 1967, so it is 85 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 11,300 vehicles a day, roughly 3% of them trucks, projected to reach 12,379 by 2025. The structure is 365 ft (111.3 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesKaumualii HWY
CrossesWaimea River
Location0.05MI Se/Ala Wai RD
RouteU.S. Route 50
CountyKauai County
StateHawaii
Coordinates21.95328, -159.66428
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
Deck7 GoodSome minor problems.
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating30.8 US tons
Inventory rating23.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length365 ft (111.3 m)
Longest span105 ft (32 m)
Deck width33 ft (10.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,300 (2017)
Projected traffic12,379 by 2025
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$15.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Kaumualii HWY over Waimea River built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1967.

What condition is Kaumualii HWY over Waimea 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 May 2023.

How much traffic does Kaumualii HWY over Waimea River carry?

About 11,300 vehicles per day (2017 count), of which roughly 3% are trucks.

How long is Kaumualii HWY over Waimea River?

The structure is 365 ft (111.3 m) long with a longest span of 105 ft (32 m) and a deck 33 ft wide.

Who owns Kaumualii HWY over Waimea River?

It is owned by the State Highway Agency.