
This 22-acre (8.9 ha) island in San Francisco Bay once served as a lighthouse, a military fortification, a military prison, and as a federal prison until 1963. The second largest of the three islands within Humboldt Bay contains: the Woodley Island Marina (Eureka's largest marina), the Eureka regional office of the National Weather Service, and offices of the Humboldt Bay Harbor Recreation & Conservation District.

The largest island, 1.3 miles (2.1 km) long, was originally the center of culture and population of the indigenous Wiyot people. The smallest of the three islands within Humboldt Bay, Daby Island has a maximum elevation of 3 feet (0.91 m) and is located slightly northeast of Woodley Island.Ĥ0☄8′46″N 124☁0′06″W / 40.8129°N 124.1684°W / 40.8129 -124.1684 ( Indian Island)

All three islands in Humboldt Bay are located in the narrow midsection of the bay.
