[1] The construction and appurtenant structures were authorized by Presidential Decree No/ 693 signed on May 7, 1975, by then President Ferdinand E. Marcos.

In addition, a US$9M loan from Bahrain was obtained for the purchase of other equipment for the diversion tunnel, soil laboratory and model testing.

Because of this, in January 2006, then President Gloria Macapagal Arroyo instructed various government agencies to create a rehabilitation plan to improve the lifespan of the dam system.

[3] The non-power components such as the dam, reservoir, and intake gates are owned, operated, and managed by the National Irrigation Administration (NIA).

[4] The dam is located within the boundaries of Namillangan, Alfonso Lista, Ifugao and Ramon, Isabela, approximately 350 kilometres (220 mi) north of Metro Manila.

[9] SN Aboitiz Power-Magat, Inc. completed the half-life refurbishment of the Magat Hydroelectric Power Plant in 2014.

Waters under the Buntun Bridge went up as high as 13 metres (43 ft), flooding the nearby barangays up to the roofs of houses.

[13] As a result of the catastrophe, the NIA said that it will review its protocols regarding the release of water in Magat Dam and improve its watershed.