The rising waters submerged the Mapanuepe Valley including the barangays of Aglao (lower), Buhawen and Pili of San Marcelino, Zambales.

During the development of the lake, breaching and reforming of the debris dam occurred following each lahar episode.

At its maximum extent, the lake grew to an area of 670 hectares (1,700 acres) and had a stored water volume of 75 x 106 cubic meters (98,000,000 cu yd) before reaching its current state.

The only structure that remains is a church tower with a huge metal cross right in the middle of the lake.

However, harmful chemicals are now diluted and the lake is believed to be safe for diving and fishing.