High Risk Dams in Hawaii

Hawaii has 88 high hazard dams with a condition assessment of poor or unsatisfactory. These are dams where failure would probably cause loss of human life and where recognized safety deficiencies have been identified.

Of the 117 high hazard dams in Hawaii, 88 (75%) have concerning condition ratings — 75 rated poor and 13 rated unsatisfactory.

Dam	County	Height (ft)	Condition	Purpose	Year
Puu Lua Reservoir	Kauai	110	Unsatisfactory	Fish and Wildlife Pond	1925
Wahiawa Dam	Honolulu	98	Poor	Irrigation	1906
Ku Tree Reservoir	Honolulu	90	Unsatisfactory	Other	1925
Horner Reservoir	Maui	70	Poor	Irrigation	1926
Mimino Reservoir	Kauai	69	Poor	Irrigation	1920
Waikoloi Reservoir	Kauai	64	Poor	Irrigation	1958
Kahoma Reservoir	Maui	60	Poor	Irrigation	1918
Kahana Nui Dam	Maui	58	Poor	Flood Risk Reduction	1984
Piwai Reservoir	Kauai	56	Poor	Irrigation	1916
Kahakapao Reservoirs	Maui	54	Poor	Water Supply	1990
Kapaia Reservoir	Kauai	53	Poor	Irrigation	1910
Wailuku Water Reservoir 10	Maui	52	Unsatisfactory	Irrigation	1951
Waimea 60 Mg Reservoir	Hawaii	52	Poor	Irrigation	1957
Kaneha Reservoir	Kauai	51	Poor	Irrigation	1910
Upper Helemano Reservoir	Honolulu	51	Poor	Irrigation	1912
Kaupale Reservoir	Kauai	50	Poor	Irrigation	1910
Ipuolono Reservoir	Kauai	50	Poor	Irrigation	1910
Twin Reservoirs	Kauai	49	Unsatisfactory	Other	1920
Papuaa Reservoir	Kauai	48	Poor	Irrigation	1914
Kumano Reservoir	Kauai	48	Poor	Irrigation	1902
Huinawai Reservoir	Kauai	47	Poor	Irrigation	1902
Pauwela Reservoir	Maui	47	Poor	Irrigation	1904
Kaloko Reservoir	Kauai	46	Poor	Irrigation	1890
Manuhonuhonu Reservoir	Kauai	45	Poor	Irrigation	1954
Peahi Reservoir	Maui	45	Poor	Irrigation	1924
Waikoloa Reservoir No. 1	Hawaii	44	Poor	Water Supply	1970
Haiku Reservoir	Maui	43	Unsatisfactory	Irrigation	1904
Olinda Reservoir	Maui	42	Poor	Water Supply	1918
Piiholo 50 Mg Reservoir	Maui	42	Unsatisfactory	Water Supply	1971
Maui Reservoir 20	Maui	42	Poor	Irrigation	1913
Halenanahu Reservoir	Kauai	40	Unsatisfactory	Irrigation	1920
Aepoekolu Reservoir	Kauai	40	Poor	Irrigation	1910
Kepani Reservoir	Kauai	40	Poor	Irrigation	1954
Maui Reservoir 24	Maui	39	Poor	Irrigation	1917
Maui Reservoir 15	Maui	39	Poor	Irrigation	1917
Helemano 6 Reservoir	Honolulu	38	Poor	Irrigation	1915
Mau Reservoir	Kauai	38	Poor	Irrigation	1901
Upper Field 14 Reservoir	Maui	38	Poor	Irrigation	1985
Aahoaka Reservoir	Kauai	38	Poor	Irrigation	1910
Elima Reservoir	Kauai	37	Poor	Irrigation	1901
Papaaea Reservoir	Maui	37	Poor	Irrigation	1902
Puu Koa Reservoir	Maui	37	Poor	Irrigation	1985
Middle Field 14 Reservoir	Maui	36	Unsatisfactory	Irrigation	2006
Hukiwai Reservoir	Kauai	36	Poor	Irrigation	1910
Aepoalua Reservoir	Kauai	35	Poor	Irrigation	1915
Maui Reservoir 33	Maui	35	Poor	Irrigation	1910
Reservoir 140	Maui	35	Poor	Irrigation	1926
Nuuanu Reservoir No. 1	Honolulu	34	Poor	Flood Risk Reduction	1905
Paauilo Reservoir	Hawaii	34	Poor	Irrigation	1975
Elua Reservoir	Kauai	34	Poor	Irrigation	1902
Mahinahina Reservoir	Maui	34	Poor	Water Supply	1995
Puu O Hewa Reservoir	Kauai	33	Poor	Irrigation	1915
Omao Reservoir	Kauai	32	Unsatisfactory	Irrigation	1915
Honokowai Reservoir	Maui	31	Poor	Irrigation	1918
Maui Reservoir 14	Maui	31	Unsatisfactory	Irrigation	1913
Waikaia Reservoir	Kauai	30	Poor	Irrigation	1951
Kehalani Offsite Retention Basin	Maui	30	Poor	Flood Risk Reduction	2003
Okinawa Reservoir	Kauai	29	Poor	Irrigation	1920
Maui Reservoir 84	Maui	29	Poor	Irrigation	1918
Waita Reservoir	Kauai	28	Poor	Irrigation	1906
Maui Reservoir 30	Maui	28	Poor	Irrigation	1917
Maui Reservoir 74	Maui	28	Poor	Irrigation	1916
Pinau Reservoir	Kauai	28	Unsatisfactory	Other	1916
Maui Reservoir 42	Maui	27	Poor	Irrigation	1917
Halaula Reservoir	Kauai	26	Poor	Irrigation	1905
Kaawanui Reservoir	Kauai	26	Poor	Irrigation	1950
Aii Reservoir	Kauai	26	Poor	Irrigation	1920
Maui Field 290 Reservoir	Maui	25	Poor	Irrigation	1997
Mana Reservoir	Kauai	25	Unsatisfactory	Irrigation	1905
Kemoo 5 Reservoir	Honolulu	25	Poor	Irrigation	1920
Kalihiwai Reservoir	Kauai	25	Poor	Irrigation	1920
Oahu Reservoir 155	Honolulu	25	Poor	Irrigation	1916
Maui Reservoir 60	Maui	25	Poor	Irrigation	1917
Maui Reservoir 73	Maui	25	Poor	Irrigation	1908
Kapa Reservoir	Kauai	24	Poor	Irrigation	1901
Maui Reservoir 81	Maui	24	Poor	Irrigation	1920
Lower Kapahi Reservoir	Kauai	24	Unsatisfactory	Other	1861
Waiakalua Reservoir	Kauai	23	Poor	Recreation	1920
Maui Reservoir 90	Maui	22	Poor	Irrigation	1917
Maui Reservoir 21	Maui	22	Poor	Irrigation	1913
Maui Reservoir 61	Maui	21	Poor	Irrigation	1917
Puu Pulehu Reservoir	Hawaii	21	Poor	Irrigation	1910
Maui Reservoir 25	Maui	20	Poor	Irrigation	1917
Mauka Reservoir	Kauai	19	Poor	Irrigation	1910
Pia Mill Reservoir	Kauai	17	Poor	Irrigation	1910
Maui Reservoir 92	Maui	16	Poor	Irrigation	1967
Maui Reservoir 70	Maui	16	Poor	Irrigation	1917
Maui Reservoir 52	Maui	15	Poor	Irrigation	1917

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