Scour Critical Bridges in Hawaii
83 bridges in Hawaii at risk from water erosion around foundations.
Scour Critical Bridges
Scour is the erosion of soil and rock around a bridge's foundation caused by moving water. When foundations are exposed or undermined, a bridge can collapse even if its deck and superstructure are in good condition. Scour is the leading cause of bridge failures in the US. These 83 bridges in Hawaii have been identified as vulnerable to scour damage.
| Bridge | State | Scour Status | Condition | Year Built | ADT |
|---|---|---|---|---|---|
| WAIKAUMALO STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1952 | 6,700 |
| MOANALULU STRM | Hawaii | Scour Critical — Countermeasures Installed | Good | 1956 | 6,700 |
| KAHOLO STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1935 | 6,700 |
| KAIPOIOI STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1933 | 5,600 |
| KOLEKOLE STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1950 | 5,600 |
| HEEIA STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1921 | 4,850 |
| KIIKII STREAM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1950 | 4,790 |
| E HIND DR/WAILUPE STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1949 | 4,780 |
| PAUKAUILA STREAM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1971 | 4,674 |
| HONOKAHUA STRM | Hawaii | Scour Critical — Countermeasures Installed | Good | 1986 | 4,300 |
| LUMAHAI STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1968 | 3,300 |
| KAPALAAU STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1940 | 2,400 |
| KAMAKALEPO STREAM | Hawaii | Scour Critical — Countermeasures Installed | Good | 1966 | 2,151 |
| OOPUOLA STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1925 | 1,800 |
| EAST WAILUAIKI STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1926 | 1,800 |
| PUOHOKAMOA STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1912 | 1,800 |
| ANI ST BR/WAILUPE STRM | Hawaii | Scour Critical — Countermeasures Installed | Good | 1954 | 1,569 |
| E MANOA RD/MANOA PK DITC | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1938 | 1,320 |
| KAMALO-UNMD STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1980 | 1,300 |
| PELEKANE DR/NUUANU STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1930 | 1,267 |
| HAPAPA GULCH | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1933 | 1,100 |
| KEAHUAIWI GULCH(PULEHU) | Hawaii | Scour Critical — Countermeasures Installed | Good | 1933 | 1,100 |
| KALIHI ST BR#3/KALIHI ST | Hawaii | Scour Critical — Countermeasures Installed | Poor | 1942 | 1,073 |
| LAULANI ST/KAMANAIKI STR | Hawaii | Scour Critical — Countermeasures Installed | Good | 1973 | 903 |
| AULOA RD/MAUNAWILI STRM | Hawaii | Scour Critical — Countermeasures Installed | Poor | 1921 | 900 |
| KAINALU STRM(KUPEKE) | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1978 | 850 |
| KIMO DR/NUUANU STRM | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1900 | 830 |
| MANUWAI CANAL | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1944 | 750 |
| Waiomao Stream | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1930 | 400 |
| WAIHEE STRM | Hawaii | Scour Critical — Countermeasures Installed | Good | 1965 | 240 |
| Kahanaiki Stream | Hawaii | Scour Critical — Countermeasures Installed | Good | 1921 | 206 |
| KAPAA STRM (KAPAHI BR) | Hawaii | Scour Critical — Countermeasures Installed | Good | 1900 | 200 |
| Hauaala Br (Kapaa Strm) | Hawaii | Scour Critical — Countermeasures Installed | Fair | 1966 | 100 |
Scour Critical Rating Codes
| Code 2 — Unaddressed | Bridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken. |
| Code 3 — Countermeasures Installed | Protective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical. |
| Code 6 — Countermeasures Ineffective | Protective measures were installed but have been assessed as ineffective. The bridge requires re-evaluation and additional action. |
About Scour Critical Bridges
Scour critical bridges have been identified through underwater inspection or analysis as having foundations that are unstable or could become unstable during flood conditions. FHWA requires action plans for all scour critical bridges. Famous scour failures include the 1987 Schoharie Creek Bridge collapse in New York.