Thursday, October 30, 2025

This Week In California History: Gaspar de Portolà Accidentally Discovers The San Francisco Bay


In a fascinating chapter of history, Gaspar de Portolà and his expedition made their way to the area near San Francisco Bay on October 31, 1769. This marked the beginning of a remarkable set of events that would unveil the beauty of San Francisco Bay, with the first European sighting occurring just a day later, on November 1. The Spanish expedition, guided by the ambitious Governor Portolà, was initially on a mission to locate Monterey Bay and set up a new base there.


As they traveled northward from San Diego in the Summer if 1769, the expedition reached a campsite near present-day Pacifica on October 31. Eager to uncover new territories, they dispatched scouts led by José Francisco Ortega to venture ahead and explore the surrounding area. The next day, Ortega's scouting party made their way up Sweeney Ridge, where they were greeted by an awe-inspiring sight: the sprawling expanse of San Francisco Bay lay before them, shimmering in the sunlight.


On November 4, the rest of Portolà's expedition followed suit, ascending Sweeney Ridge and experiencing the same breathtaking view of the bay for the first time. Interestingly, the team had initially aimed for Monterey Bay but serendipitously stumbled upon San Francisco Bay instead. At the time, Portolà didn’t fully grasp the importance of this discovery; to him, the bay appeared merely as an obstacle thwarting his original plan. Little did he know, this “barrier” would become one of the most iconic natural landmarks in the world!

It’s fascinating how chance can lead to significant discoveries, shaping the course of history in ways we may not fully appreciate at the moment.

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