Tallest Dams in Hawaii

Hawaii has 124 dams with recorded heights. The tallest is Alexander at 141 feet. Taller dams impound more water and carry greater potential energy, which is why height is a key factor in hazard classification and inspection requirements.

#	Dam	County	Height (ft)	Type	Purpose	Hazard	Year
1	Alexander	Kauai	141	Earth	Hydroelectric	High	1931
2	Puu Lua Reservoir	Kauai	110	Earth	Fish and Wildlife Pond	High	1925
3	Wahiawa Dam	Honolulu	98	Earth	Irrigation	High	1906
4	Ku Tree Reservoir	Honolulu	90	Earth	Other	High	1925
5	Kaneohe Dam	Honolulu	83	Earth	Flood Risk Reduction	High	1980
6	Aepo Reservoir	Kauai	74	Earth	Irrigation	High	1901
7	Nuuanu Dam No. 4	Honolulu	73	Earth	Flood Risk Reduction	High	1910
8	Opaeula 01 Reservoir	Honolulu	71	Earth	Irrigation	High	1910
9	Koolau Reservoir	Honolulu	70	Earth	Other	Low	1919
10	Horner Reservoir	Maui	70	Earth	Irrigation	High	1926
11	Mimino Reservoir	Kauai	69	Earth	Irrigation	High	1920
12	Waimanalo 60 Mg Reservoir	Honolulu	65	Earth	Irrigation	High	1993
13	Waikoloi Reservoir	Kauai	64	Earth	Irrigation	High	1958
14	Kahoma Reservoir	Maui	60	Earth	Irrigation	High	1918
15	Kualapuu Reservoir	Maui	58	Earth	Irrigation	High	1969
16	Kahana Nui Dam	Maui	58	Earth	Flood Risk Reduction	High	1984
17	Piwai Reservoir	Kauai	56	Earth	Irrigation	High	1916
18	Waikoloa Reservoir No. 3	Hawaii	54	Earth	Water Supply	High	1985
19	Kahakapao Reservoirs	Maui	54	Earth	Water Supply	High	1990
20	Kapaia Reservoir	Kauai	53	Earth	Irrigation	High	1910
21	Waimea 60 Mg Reservoir	Hawaii	52	Earth	Irrigation	High	1957
22	Wailuku Water Reservoir 10	Maui	52	Earth	Irrigation	High	1951
23	Upper Helemano Reservoir	Honolulu	51	Earth	Irrigation	High	1912
24	Kaneha Reservoir	Kauai	51	Earth	Irrigation	High	1910
25	Kaupale Reservoir	Kauai	50	Earth	Irrigation	High	1910
26	Ipuolono Reservoir	Kauai	50	Earth	Irrigation	High	1910
27	Honokowai - Structure #8	Maui	50	Earth	Flood Risk Reduction	High	1995
28	Twin Reservoirs	Kauai	49	Earth	Other	High	1920
29	Papuaa Reservoir	Kauai	48	Earth	Irrigation	High	1914
30	Kumano Reservoir	Kauai	48	Earth	Irrigation	High	1902
31	Ioleau Reservoir	Kauai	48	Earth	Irrigation	Low	1902
32	Huinawai Reservoir	Kauai	47	Earth	Irrigation	High	1902
33	Pauwela Reservoir	Maui	47	Earth	Irrigation	High	1904
34	Maui Reservoir 40	Maui	47	Earth	Irrigation	High	1926
35	Kaloko Reservoir	Kauai	46	Earth	Irrigation	High	1890
36	Manuhonuhonu Reservoir	Kauai	45	Earth	Irrigation	High	1954
37	Peahi Reservoir	Maui	45	Earth	Irrigation	High	1924
38	Waikoloa Reservoir No. 1	Hawaii	44	Earth	Water Supply	High	1970
39	Haiku Reservoir	Maui	43	Earth	Irrigation	High	1904
40	Napili 2-3 Desilting Basin	Maui	43	Earth	Flood Risk Reduction	High	1988
41	Aepoeha Reservoir	Kauai	42	Earth	Irrigation	High	1913
42	Olinda Reservoir	Maui	42	Earth	Water Supply	High	1918
43	Piiholo 50 Mg Reservoir	Maui	42	Earth	Water Supply	High	1971
44	Maui Reservoir 20	Maui	42	Earth	Irrigation	High	1913
45	Puu Opae Reservoir	Kauai	41	Earth	Irrigation	Low	1930
46	Pa Aalii Reservoir	Hawaii	40	Earth	Other	High	1940
47	Halenanahu Reservoir	Kauai	40	Earth	Irrigation	High	1920
48	Aepoekolu Reservoir	Kauai	40	Earth	Irrigation	High	1910
49	Kepani Reservoir	Kauai	40	Earth	Irrigation	High	1954
50	Maui Reservoir 24	Maui	39	Earth	Irrigation	High	1917

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