This six‑acre undeveloped island sits near the Richmond–San Rafael Bridge, north of San Francisco, offering a rare opportunity to acquire a private retreat with both boat and helicopter access. Historically used by the seller’s family for camping, hiking, and fishing, the island provides a quiet natural setting within reach of the Bay Area.
The Property
The island includes a sandy beach on its east side, with rugged shoreline along the south and west. Trails lead to a grassy, domed peak. Remnants of 19th‑century manganese mining remain, including abandoned tunnels and the former site of a fog bell once maintained by the Coast Guard. According to family accounts, the bell disappeared following a salvage incident involving a loose Chevron barge.
The Land and Water
The island spans approximately six acres and features varied shoreline, natural trails, and elevated terrain. Its reddish coloration is attributed to historic manganese mining. The surrounding waters support access by boat, and the island’s size and topography allow for a range of potential uses.
Access and Utilities
The island is accessible by boat or helicopter.
The Lifestyle
The property supports a quiet, nature‑focused environment suited to retreat use or long‑term development. Past proposals have included conservation concepts, a hotel, a marina, a residence, or quarrying the island’s rock for construction. The seller, who has lived in Alaska for more than two decades, is offering the island to support care for an aging family member.
