The dam was constructed to last for 50 years but increased siltation and sedimentation in the reservoir, slash-and-burn farming, illegal logging and fish-caging resulted in the deterioration of the dam's watershed. The 1990 Luzon earthquake also contributed to the increased siltation in the Magat River system. Because of this, on January 2006, then President Gloria Macapagal Arroyo instructed various government agencies to create a rehabilitation plan to improve the lifespan of the dam system.