Spain was driven to establish
missions and other outposts on the Pacific Coast north of the
Baja California Peninsula by fears that the territory would be claimed by competing foreign powers, in addition to its Catholic proselytizing mission and need for additional sources of income. The
British, who had established
several colonies on the East Coast of North America, had also sent explorers into the Pacific. Russian fur hunters were pressing east from
Siberia across the
Bering Strait into the
Aleutian Islands and beyond. Dispatches of January 23, 1768, exchanged between King Carlos and the viceroy, set the wheels in motion to extend Spain's control up the Pacific Coast and establish colonies and missions at
San Diego Bay and
Monterey Bay, which had been discovered and described in reports by earlier explorers
Juan Cabrillo and
Sebastián Vizcaíno. Vizcaíno had mapped the California coastline as far north as Monterey in 1602, but no significant Spanish settlement or even trading station had followed because those earlier explorations had failed to find a good harbor that the Spanish could have used for their long-standing Pacific maritime trade between Asia and Mexico: Monterey Bay, sighted by both Cabrillo and Vizcaíno, was exposed to rough currents and winds. In May 1768, the Spanish Visitor General,
José de Gálvez, began to organize an
expedition, by sea and by land. Portolá was created "Governor of the Californias" and given overall command.
Junípero Serra, leader of the expedition's
Franciscan missionaries, took command of spiritual matters. Sea and land detachments were to meet at San Diego Bay. monument in
Pacifica, California honoring Portolá's first sighting of
San Francisco Bay. The first ship, the
San Carlos, sailed from
La Paz on January 10, 1769 and a second, the
San Antonio sailed from
Cabo San Lucas on February 15. At the same time, the various elements of the land parties began to move north from
Loreto, Baja California Sur. The land expedition was assembled at Velicatá, where Serra established his first new
mission. From there, Portolá's plan called for splitting the land expedition in two. The lead group, charged with building a wagon trail and pacifying the natives, was led by Captain
Fernando Rivera y Moncada, and departed from Velicatá on March 24. With Rivera was the priest
Juan Crespí, diarist for the Franciscans. The expedition led by Portolá, which included
Junípero Serra (the President of the Missions), along with a combination of missionaries, settlers, and leather-jacket soldiers, including
José Raimundo Carrillo, left Velicatá on May 15. Junípero Serra founded two more missions during the expedition:
San Diego de Alcalá on July 16, 1769 and
Mission San Carlos Borromeo de Carmelo on June 3, 1770. Rivera reached the site of present-day
San Diego in May, established a camp in the area that is now
Old Town and awaited the arrival of the others. Because of an error by Vizcaíno in determining the latitude of the San Diego Harbor, the ships passed by it and landed too far north before finding their way back. The
San Antonio arrived on April 11 and the
San Carlos, the first ship to leave La Paz, having met with fierce winds and storms on the journey, arrived on April 29. A third vessel was to follow with supplies, but it was probably lost at sea. The land expedition of Portolá arrived on June 29. After their arduous journeys, most of the men aboard ship were ill, chiefly from
scurvy, and many had died. Out of a total of 219 who left Baja California, little more than 100 now survived. , Catalonia. Eager to press on to
Monterey Bay, Portolá and his expedition, consisting of Juan Crespí, 63 leather-jacket soldiers and 100 mules loaded down with provisions, headed north on July 14, 1769, marching two to four leagues (1 league = 2.6 miles) a day. The expedition recorded an
earthquake on July 28 at the
Santa Ana River. On July 29 they reached the site of present-day
Fullerton, California at
Hillcrest Park. On July 30, the expedition crossed the
Puente Hills at a pass in
La Habra (North Harbor Boulevard). They moved north-west to the
San Gabriel River (near
El Monte) where they built a bridge to cross over. This bridge ('La Puente' in Crespi's diary) is remembered in the name of today's nearby city of
La Puente. They arrived in what is now
Los Angeles on August 2 (where the
Los Angeles River and Arroyo Seco river meet). The following day, they marched out the Indian trail that would one day become
Wilshire Boulevard to the present site of
Santa Monica. Winding around to the area of later
Saugus, now part of
Santa Clarita, they reached the area to become
Santa Barbara on August 19, and the present-day
San Simeon area on September 13. Unable to remain on the coast due to the steep, difficult terrain, the party turned inland. They marched through the San Antonio Valley and on October 1, Portolá's party emerged from the
Santa Lucia Mountains and reached the mouth of the
Salinas River. . After a march of some from San Diego and about from Velicatá, they had reached the bay they were seeking. But they failed to discern the coastline's semi-circular shape, described by Vizcaíno as round like an "O", even though members of the party had twice marched along its beach. Having failed to find their goal, they marched on north and reached the area at the north end of the bay, where Crespí named a creek
Santa Cruz on October 18. Pushing on, they reached a creek in the present-day town of
Pacifica on October 31. On November 4, having crossed the low coastal mountain range above the creek, the party was stunned to catch a glimpse of the enormous
San Francisco Bay from the mountain range, as the bay was previously unknown to the Spanish. This sighting was crucial to the later settlement of California because unlike Monterey Bay, it was surrounded by land on all sides except the Golden Gate, and thus it was not exposed to rough ocean currents as was Monterey Bay, which had been known to the Spanish since Cabrillo's exploration in the sixteenth century. Despite the earlier explorations of Cabrillo and Vizcaíno, and despite two centuries of Spanish sailing the Pacific for trade between Asia and Mexico, the San Francisco Bay had been missed because of the fog that frequently shrouded its entrance. If the San Francisco Bay had been discovered earlier, the region surrounding would have been settled by the Spanish earlier since it would have provided a safe, convenient harbor for Spain's Pacific maritime trade. Portolá's party then headed back to San Diego, exploring and naming many localities in the region south of what eventually became known as the
Golden Gate. Surviving on mule meat for most of the journey, they arrived on January 24, 1770. On their way past Monterey Bay, they again failed to recognize it as the same bay that Vizcaíno had described in 1602. ==Second expedition==