On July 25, 1898, lighthouse keeper Robustiano Rivera spotted the convoy of the American forces that initiated the landing offensive of the Puerto Rican Campaign during the Spanish–American War.

He immediately gave the alert to the residents of Guánica and marched to Yauco where he broke the news of the invading forces to the city's mayor.

[4][5] By 2009, the lighthouse was practically in ruins, though some parts of its unique architectural elements were still visible.

[7] A series of earthquakes that occurred in January 2020 in Puerto Rico further damaged the Guánica lighthouse.

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