US Bridges

Kaumualii HWY over Unknown Stream

Fair

Kauai County, Hawaii · .1 MI W of Kuhio HWY · Structure no. 007000500300100

Built
2000
25 years old
Condition
Fair
inspected January 2025
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
46 ft
3 main spans
Daily traffic
34,000
2017 count
Owner
State
State Highway Agency

About this bridge

Kaumualii HWY over Unknown Stream is a aluminum, wrought iron, or cast iron culvert carrying Kaumualii HWY over Unknown Stream in Kauai County, Hawaii. It was built in 2000, so it is 25 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 34,000 vehicles a day, roughly 4% of them trucks, projected to reach 32,243 by 2025. The structure is 46 ft (14 m) long.

CarriesKaumualii HWY
CrossesUnknown Stream
Location.1 MI W of Kuhio HWY
RouteU.S. Route 50
StateHawaii
Coordinates21.97607, -159.37188
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating37.5 US tons
Inventory rating31.1 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans3
Design loadHS 20
Structure length46 ft (14 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,000 (2017)
Projected traffic32,243 by 2025
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 Kaumualii HWY over Unknown Stream built?

It was built in 2000, making it 25 years old in 2025.

What condition is Kaumualii HWY over Unknown 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 January 2025.

How much traffic does Kaumualii HWY over Unknown Stream carry?

About 34,000 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is Kaumualii HWY over Unknown Stream?

The structure is 46 ft (14 m) long with a longest span of 12 ft (3.7 m).

Who owns Kaumualii HWY over Unknown Stream?

It is owned by the State Highway Agency.