Scour-Critical Bridges in Hawaii

Hawaii has 82 bridges rated scour-critical by the Federal Highway Administration. These bridges have foundations that are unstable or at risk of undermining during flood events. Scour-critical doesn't mean a bridge is about to collapse — it means extra monitoring and countermeasures are in place — but these structures are priorities for repair or replacement.

How this ranking works

This state list filters to NBI scour ratings 0 through 3, then sorts by average daily traffic. It is intended to show flood-vulnerability exposure, not to label any bridge as currently unsafe.

Bridge	County	Scour Rating	Daily Traffic	Condition
Fai-h1 over Manoa Palolo Strm	Honolulu	3 — Serious	112,200	Fair
South King ST over Manoa Palolo Strm(king)	Honolulu	3 — Serious	112,200	Fair
Farr HWY over Keananoio Strm (o.b)	Honolulu	3 — Serious	33,900	Fair
Likelike HWY Ob over Kalihi Strm	Honolulu	3 — Serious	33,000	Good
Likelike HWY Ib. over Kalihi Strm	Honolulu	3 — Serious	33,000	Good
Kuhio HWY over Wailua River	Kauai	3 — Serious	31,600	Poor
Kuhio Hwy/plan.rd. over Wailua River	Kauai	3 — Serious	31,600	Fair
Kaumualii HWY over Weoweopilau Strm	Kauai	3 — Serious	28,400	Fair
Honoapiilani HWY over Ukumehame Strm	Maui	3 — Serious	27,400	Fair
Keeau-pahoa HWY over Waipahoehoe Strm	Hawaii	3 — Serious	26,700	Good
Kaumualii HWY over Huleia Strm	Kauai	3 — Serious	26,700	Good
N King ST over Kalihi Strm	Honolulu	3 — Serious	25,033	Fair
Old Waialae RD over Manoa Palolo Strm	Honolulu	3 — Serious	21,400	Fair
Kaumualii HWY over Lawai Strm	Kauai	3 — Serious	20,600	Fair
Kapiolani BLVD over Manoa-palolo Strm	Honolulu	3 — Serious	18,917	Good
Kikowaena ST over Moanalua Strm	Honolulu	3 — Serious	17,692	Fair
Kam HWY over Kaalaea Strm	Honolulu	3 — Serious	16,500	Fair
Hawaii Belt RD over Wailuku Strm	Hawaii	3 — Serious	15,600	Fair
N School ST over Kalihi Strm	Honolulu	3 — Serious	14,551	Fair
N Kuakini ST over Waiolani Strm	Honolulu	3 — Serious	14,427	Good
Honoapiilani HWY over Waikapu Strm	Maui	3 — Serious	14,200	Fair
N Kuakini ST over Nuuanu Strm	Honolulu	3 — Serious	13,883	Fair
Hawaii Belt RD over Kapue Strm	Hawaii	3 — Serious	13,600	Fair
Hana HWY over Maliko Strm	Maui	3 — Serious	13,300	Fair
Date ST over Manoa Palolo Strm	Honolulu	3 — Serious	12,921	Fair
Kamehameha HWY over Anahulu Strm	Honolulu	3 — Serious	12,850	Poor
Kam HWY over Hakipuu Strm	Honolulu	3 — Serious	12,800	Fair
Kam HWY over Lauhulu Strm	Honolulu	3 — Serious	12,700	Fair
Kam HWY over Kawailoa Strm	Honolulu	3 — Serious	12,700	Good
Kam HWY over Waimea Strm	Honolulu	3 — Serious	12,700	Fair
Kawailoa RD over Kaelepulu Stream	Honolulu	3 — Serious	12,657	Fair
Wyllie ST over Waiolani Strm	Honolulu	3 — Serious	12,302	Fair
Kam HWY over Paumalu Strm	Honolulu	3 — Serious	12,100	Fair
Kam HWY over Up Poamoho Strm-brodie 2	Honolulu	3 — Serious	11,800	Good
Kam HWY over Waialua Twn A (helemano)	Honolulu	3 — Serious	11,600	Fair
Kam HWY over Opaelua Waialua Twn B	Honolulu	3 — Serious	11,600	Fair
Kaumualii HWY over Waimea River	Kauai	3 — Serious	11,300	Fair
Kam HWY over N Punaluu Strm	Honolulu	3 — Serious	11,100	Poor
Kam HWY over Makaua Strm	Honolulu	3 — Serious	11,100	Fair
Hawaii Belt RD over Kaieie Strm	Hawaii	3 — Serious	10,400	Fair
Kam HWY over Koloa Strm-laiemaloo	Honolulu	3 — Serious	10,200	Fair
Hawaii Belt RD over Paheehee Strm	Hawaii	3 — Serious	10,000	Fair
Hawaii Belt RD over Hanawi Strm	Hawaii	3 — Serious	10,000	Good
Hawaii Belt RD over Kalaoa Strm	Hawaii	3 — Serious	10,000	Good
Kalihi ST over Kamanaiki Strm	Honolulu	3 — Serious	9,470	Fair
Farr HWY over Kaukonahua Strm	Honolulu	3 — Serious	9,100	Good
Palolo AVE over Pukele Strm	Honolulu	3 — Serious	8,680	Fair
Farr HWY over Farr Hwy/honouliuli Strm	Honolulu	3 — Serious	7,587	Fair
Hawaii Belt RD over Kaholo Strm	Hawaii	3 — Serious	6,700	Fair
Hawaii Belt RD over Moanalulu Strm	Hawaii	3 — Serious	6,700	Good
Hawaii Belt RD over Waikaumalo Strm	Hawaii	3 — Serious	6,700	Fair
Hawaii Belt RD over Hakalau Strm	Hawaii	3 — Serious	6,700	Poor
Hawaii Belt RD over Kolekole Strm	Hawaii	3 — Serious	5,600	Fair
Kula HWY over Kaipoioi Strm	Maui	3 — Serious	5,600	Fair
Kam HWY over Heeia Strm	Honolulu	3 — Serious	4,850	Fair
Waialua Beach RD over Kiikii Stream	Honolulu	3 — Serious	4,790	Fair
East Hind Dr. over E Hind Dr/wailupe Strm	Honolulu	3 — Serious	4,780	Fair
Haleiwa RD over Paukauila Stream	Honolulu	3 — Serious	4,674	Fair
Honoapiilani HWY over Honokahua Strm	Maui	3 — Serious	4,300	Good
Kuhio HWY over Lumahai Strm	Kauai	3 — Serious	3,300	Fair
Farr HWY over Kapalaau Strm	Honolulu	3 — Serious	2,400	Fair
Maunawili Rd. over Kamakalepo Stream	Honolulu	3 — Serious	2,151	Good
Hana HWY over Oopuola Strm	Maui	3 — Serious	1,800	Fair
Hana HWY over Puohokamoa Strm	Maui	3 — Serious	1,800	Fair
Hana HWY over East Wailuaiki Strm	Maui	3 — Serious	1,800	Fair
Ani St. over Ani ST Br/wailupe Strm	Honolulu	3 — Serious	1,569	Good
East Manoa RD over E Manoa Rd/manoa Pk Ditc	Honolulu	3 — Serious	1,320	Fair
Kam V HWY over Kamalo-unmd Strm	Maui	3 — Serious	1,300	Fair
Pelekane Dr. over Pelekane Dr/nuuanu Strm	Honolulu	3 — Serious	1,267	Fair
Kekaulike AVE over Keahuaiwi Gulch(pulehu)	Maui	3 — Serious	1,100	Good
Kekaulike AVE over Hapapa Gulch	Maui	3 — Serious	1,100	Fair
Kalihi ST over Kalihi ST Br#3/kalihi ST	Honolulu	3 — Serious	1,073	Poor
Laulani ST over Laulani St/kamanaiki Str	Honolulu	3 — Serious	903	Good
Auloa RD over Auloa Rd/maunawili Strm	Honolulu	3 — Serious	900	Poor
Kam V HWY over Kainalu Strm(kupeke)	Maui	3 — Serious	850	Fair
Kimo Dr. over Kimo Dr/nuuanu Strm	Honolulu	3 — Serious	830	Fair
Halehaka Street over Manuwai Canal	Honolulu	3 — Serious	750	Fair
10th Avenue Pl over Waiomao Stream	Honolulu	3 — Serious	400	Fair
Ahilama RD over Waihee Strm	Honolulu	3 — Serious	240	Good
Auloa RD over Kahanaiki Stream	Honolulu	3 — Serious	206	Good
Kawaihau RD over Kapaa Strm (kapahi Br)	Kauai	3 — Serious	200	Good
Hauaala Road over Hauaala Br (kapaa Strm)	Kauai	3 — Serious	100	Fair