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Kaumualii Hwy over Mahinauli Strm

Kauai County, Hawaii · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Kaumualii Hwy over Mahinauli Strm in Kauai County, Hawaii, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1948, making it 77 years old at the 2025 inventory.
It carries about 11,800 vehicles a day (traffic count year 2019).
Its listed owner is the state highway agency.
It is one of 56 of the 85 inventoried bridges in Kauai County rated fair (65.9%); 6 (7.1%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Continuous concrete tee beam
Length	about 122 ft
Location	0.27MI Se/makaweli P.o.
NBI structure number	007000500301258
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Hawaii department of transportation.

Bridge	Built	Vehicles/day	Condition
Kaumualii Hwy over Nawiliwili Str/lihue M	1936	34,100	Fair
Kaumualii Highway over Nawiliwili Stream OB	2014	34,100	Good
Kaumualii Hwy over Unknown Stream	2000	34,000	Fair
Kuhio Hwy over Wailua River	1945	31,600	Poor
Kuhio Hwy/plan.rd. over Wailua River	1920	31,600	Fair
Kuhio Hwy over Uhelekawawa Canal	1963	29,200	Fair