Oldest Dams in Hawaii

Hawaii has 124 dams with recorded construction dates. The oldest dates to 1861 — 165 years ago. Hawaii's earliest dams were built in the 19th century, an era of westward expansion, irrigation development, and early water infrastructure. Older dams require particular attention for safety, as many were built before modern engineering standards.

#	Dam	County	Year Built	Age	Height (ft)	Hazard	Condition
1	Lower Kapahi Reservoir	Kauai	1861	165 yrs	24	High	Unsatisfactory
2	Kaloko Reservoir	Kauai	1890	136 yrs	46	High	Poor
3	Kapa Reservoir	Kauai	1901	125 yrs	24	High	Poor
4	Aepo Reservoir	Kauai	1901	125 yrs	74	High	Fair
5	Mau Reservoir	Kauai	1901	125 yrs	38	High	Poor
6	Elima Reservoir	Kauai	1901	125 yrs	37	High	Poor
7	Huinawai Reservoir	Kauai	1902	124 yrs	47	High	Poor
8	Kumano Reservoir	Kauai	1902	124 yrs	48	High	Poor
9	Elua Reservoir	Kauai	1902	124 yrs	34	High	Poor
10	Ioleau Reservoir	Kauai	1902	124 yrs	48	Low	Poor
11	Papaaea Reservoir	Maui	1902	124 yrs	37	High	Poor
12	Pauwela Reservoir	Maui	1904	122 yrs	47	High	Poor
13	Haiku Reservoir	Maui	1904	122 yrs	43	High	Unsatisfactory
14	Nuuanu Reservoir No. 1	Honolulu	1905	121 yrs	34	High	Poor
15	Halaula Reservoir	Kauai	1905	121 yrs	26	High	Poor
16	Mana Reservoir	Kauai	1905	121 yrs	25	High	Unsatisfactory
17	Wahiawa Dam	Honolulu	1906	120 yrs	98	High	Poor
18	Waita Reservoir	Kauai	1906	120 yrs	28	High	Poor
19	Maui Reservoir 73	Maui	1908	118 yrs	25	High	Poor
20	Puu Pulehu Reservoir	Hawaii	1910	116 yrs	21	High	Poor
21	Nuuanu Dam No. 4	Honolulu	1910	116 yrs	73	High	Fair
22	Opaeula 01 Reservoir	Honolulu	1910	116 yrs	71	High	Fair
23	Mauka Reservoir	Kauai	1910	116 yrs	19	High	Poor
24	Kapaia Reservoir	Kauai	1910	116 yrs	53	High	Poor
25	Aepoekolu Reservoir	Kauai	1910	116 yrs	40	High	Poor
26	Kaupale Reservoir	Kauai	1910	116 yrs	50	High	Poor
27	Pia Mill Reservoir	Kauai	1910	116 yrs	17	High	Poor
28	Kaneha Reservoir	Kauai	1910	116 yrs	51	High	Poor
29	Aahoaka Reservoir	Kauai	1910	116 yrs	38	High	Poor
30	Ipuolono Reservoir	Kauai	1910	116 yrs	50	High	Poor
31	Hukiwai Reservoir	Kauai	1910	116 yrs	36	High	Poor
32	Maui Reservoir 33	Maui	1910	116 yrs	35	High	Poor
33	Upper Helemano Reservoir	Honolulu	1912	114 yrs	51	High	Poor
34	Aepoeha Reservoir	Kauai	1913	113 yrs	42	High	Fair
35	Maui Reservoir 14	Maui	1913	113 yrs	31	High	Unsatisfactory
36	Maui Reservoir 20	Maui	1913	113 yrs	42	High	Poor
37	Maui Reservoir 21	Maui	1913	113 yrs	22	High	Poor
38	Papuaa Reservoir	Kauai	1914	112 yrs	48	High	Poor
39	Helemano 6 Reservoir	Honolulu	1915	111 yrs	38	High	Poor
40	Aepoalua Reservoir	Kauai	1915	111 yrs	35	High	Poor
41	Omao Reservoir	Kauai	1915	111 yrs	32	High	Unsatisfactory
42	Puu O Hewa Reservoir	Kauai	1915	111 yrs	33	High	Poor
43	Oahu Reservoir 155	Honolulu	1916	110 yrs	25	High	Poor
44	Piwai Reservoir	Kauai	1916	110 yrs	56	High	Poor
45	Pinau Reservoir	Kauai	1916	110 yrs	28	High	Unsatisfactory
46	Maui Reservoir 74	Maui	1916	110 yrs	28	High	Poor
47	Maui Reservoir 24	Maui	1917	109 yrs	39	High	Poor
48	Maui Reservoir 15	Maui	1917	109 yrs	39	High	Poor
49	Maui Reservoir 22	Maui	1917	109 yrs	30	High	Fair
50	Maui Reservoir 82	Maui	1917	109 yrs	13	Significant	Poor

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