Dams in Maui County, Hawaii

54Total Dams

51High Hazard

2Significant

Dam Safety in Maui County, Hawaii

Maui County has 54 dams tracked in the National Inventory of Dams. Of these, 51 are classified as high hazard — meaning failure would probably cause loss of human life. Another 2 carry a significant hazard classification. Currently, 41 dams have a condition assessment of poor or unsatisfactory.

The average dam in Maui County is 82 years old. The most common purpose is irrigation. The tallest dam is Horner Reservoir at 70 ft.

Explore more: Oldest dams in Hawaii · Tallest dams · High risk dams · Largest reservoirs

Dam	Hazard	Condition	Height (ft)	Purpose	Year
Horner Reservoir	High	Poor	70	Irrigation	1926
Kahoma Reservoir	High	Poor	60	Irrigation	1918
Kualapuu Reservoir	High	Fair	58	Irrigation	1969
Kahana Nui Dam	High	Poor	58	Flood Risk Reduction	1984
Kahakapao Reservoirs	High	Poor	54	Water Supply	1990
Wailuku Water Reservoir 10	High	Unsatisfactory	52	Irrigation	1951
Honokowai - Structure #8	High	Fair	50	Flood Risk Reduction	1995
Pauwela Reservoir	High	Poor	47	Irrigation	1904
Maui Reservoir 40	High	Fair	47	Irrigation	1926
Peahi Reservoir	High	Poor	45	Irrigation	1924
Haiku Reservoir	High	Unsatisfactory	43	Irrigation	1904
Napili 2-3 Desilting Basin	High	Fair	43	Flood Risk Reduction	1988
Olinda Reservoir	High	Poor	42	Water Supply	1918
Piiholo 50 Mg Reservoir	High	Unsatisfactory	42	Water Supply	1971
Maui Reservoir 20	High	Poor	42	Irrigation	1913
Maui Reservoir 24	High	Poor	39	Irrigation	1917
Maui Reservoir 15	High	Poor	39	Irrigation	1917
Upper Field 14 Reservoir	High	Poor	38	Irrigation	1985
Papaaea Reservoir	High	Poor	37	Irrigation	1902
Puu Koa Reservoir	High	Poor	37	Irrigation	1985
Middle Field 14 Reservoir	High	Unsatisfactory	36	Irrigation	2006
Maui Reservoir 33	High	Poor	35	Irrigation	1910
Reservoir 140	High	Poor	35	Irrigation	1926
Mahinahina Reservoir	High	Poor	34	Water Supply	1995
Wailuku Water Reservoir 6	High	Fair	33	Irrigation	1967
Plantation Reservoir	High	Fair	31	Irrigation	1989
Honokowai Reservoir	High	Poor	31	Irrigation	1918
Maui Reservoir 14	High	Unsatisfactory	31	Irrigation	1913
Hanakaoo Reservoir	High	Fair	30	Irrigation	1918
Kaopala Basin	High	Fair	30	Flood Risk Reduction	1998
Maui Reservoir 22	High	Fair	30	Irrigation	1917
Kehalani Offsite Retention Basin	High	Poor	30	Flood Risk Reduction	2003
Maui Reservoir 84	High	Poor	29	Irrigation	1918
Maui Reservoir 80	High	Fair	29	Irrigation	1917
Maui Reservoir 30	High	Poor	28	Irrigation	1917
Maui Reservoir 74	High	Poor	28	Irrigation	1916
Maui Reservoir 42	High	Poor	27	Irrigation	1917
Kaili Ili Reservoir	High	Fair	25	Irrigation	1984
Maui Field 290 Reservoir	High	Poor	25	Irrigation	1997
Maui Reservoir 60	High	Poor	25	Irrigation	1917
Maui Reservoir 73	High	Poor	25	Irrigation	1908
Maui Reservoir 81	High	Poor	24	Irrigation	1920
Maui Reservoir 90	High	Poor	22	Irrigation	1917
Maui Reservoir 21	High	Poor	22	Irrigation	1913
Maui Reservoir 61	High	Poor	21	Irrigation	1917
Maui Reservoir 25	High	Poor	20	Irrigation	1917
Napili 4-5 Desilting Basin	High	Fair	18	Flood Risk Reduction	1985
Happy Valley Flood Prevention	High	Not Rated	18	Flood Risk Reduction	1980
Maui Reservoir 92	High	Poor	16	Irrigation	1967
Maui Reservoir 70	High	Poor	16	Irrigation	1917
Maui Reservoir 52	High	Poor	15	Irrigation	1917
Waikamoi Reservoirs	Significant	Poor	20	Water Supply	1980
Maui Reservoir 82	Significant	Poor	13	Irrigation	1917
Waikamoi Dam No. 2	Low	Poor	35	Water Supply	1956

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