The two peninsulas that shelter JADA's home marina were not always there. One hundred years ago, where Shelter Island and Harbor Island now stand was open water — in some places, bay bottom that broke the surface at low tide, a sandbar a child could wade across when the tide was out. What exists today was built: deliberately, over decades, from the floor of the same bay it now occupies. When you sail past these places — their palms, their packed marinas, their rows of restaurants catching the last of the afternoon light — you are looking at one of the more remarkable acts of civic reinvention in California history. San Diego did not find this waterfront. It made it.
In the 1930s, Shelter Island barely registered as land. A low, shifting sandbar had formed over centuries as sediment washed down from the San Diego River, surfacing reliably only at low tide and drawing little attention from anyone other than shorebirds and the occasional wading fisherman. Then in 1934, the Port of San Diego initiated a major dredging project to widen and deepen the harbor channel — and the material coming up from the bay floor needed somewhere to go. Harbor engineers looked at the sandbar and saw potential. By the late 1930s, that deposited material had elevated the site above sea level and established its foundational landmass. When the Navy required deeper berths during World War II, further dredging added more volume to the bar. Then, in the late 1940s, the San Diego Harbor Commission undertook a new program: the dredged material was used to connect the growing peninsula to the Point Loma shore with a causeway and to raise it fourteen feet above low tide. By the early 1950s, a genuine island stood where the shorebirds had been.
When the press covered the result, the phrase that kept appearing was something from nothing — a man-made peninsula rising out of a bay that had provided its own building material. Yacht clubs followed: Silver Gate Yacht Club took up residence on the island itself; San Diego Yacht Club and Southwestern Yacht Club found berths in the sheltered harbor the new peninsula created. The Polynesian tiki aesthetic that defines the commercial strip to this day dates from the same postwar period, when a city full of Pacific veterans found something familiar in the palm-lined horizon and the smell of salt air at happy hour. The bay gave them what they needed, and they decorated it accordingly.
If Shelter Island was the proof of concept, Harbor Island was the main event. In 1961, the Port of San Diego undertook a massive dredging project to deepen the shipping channel through the bay's northern reach. More than twelve million cubic yards of sand, silt, and bay floor came to the surface — and instead of disposing of it offshore, engineers used the material to construct a two-mile-long peninsula north-northeast of Shelter Island, separated from the airport runway by Harbor Drive and not much else.
When the work was complete, the Port of San Diego owned new real estate: marinas, a waterfront promenade, restaurants, hotels, and parks all sitting on ground that had been submerged bay floor more than sixty years before. The goal was economic development paired with the deeper Navy berths the dredging had simultaneously created. Today Harbor Island holds thousands of boat slips, the kind of sunset that organizes an evening, and the particular pleasure of watching commercial jets on final approach cross the sky immediately overhead — gear down, engines pulling back, close enough to read the livery — while you sit at a table ten feet from the water. That specific layering of bay, aviation, and sailboat masts at the golden hour exists nowhere else on the American coast in quite this configuration, and it was not planned so much as arrived at.
What makes both islands genuinely extraordinary, once you know their history, is the circularity of the story. San Diego needed to deepen its harbor for its Navy. Deepening the harbor produced material. That material became the islands. The islands sheltered the marinas. The marinas became the foundation of a waterfront that draws millions of people a year to a city that built its most-loved neighborhoods from what it excavated.
The bay gave itself to the city to build it. And the city said yes.
Come see the whole story from the deck of JADA — a 1938 classic wooden yacht built in Stockton, California, restored, and now sailing these waters — and watch the bay you're moving through slowly reveal how it got this way.
Hear this story where it happened. JADA sails past this very spot. Join the San Diego Bay History Sail →
Wear the story. Two peninsulas. Zero mountains. Ten million cubic yards of bay bottom and a very good idea. The Built from the Bay shirt →