Location
Wappatoo Island, now Sauvie Island, lies just north of the main confluence of the Willamette and Columbia Rivers. The north end of the island is at the confluence with the Multnomah Channel. The post was built on the north end of the island, but was moved the next year toward the center of the island due to seasonal flooding. Fort William was west of and on the opposite side of the river from the Hudson’s Bay Company’s (HBC) Fort Vancouver, established in 1824 on the north side of the Columbia. It was about 90 miles (140 km) upriver from the mouth of the Columbia and the HBC post of Fort George (formerly Fort Astoria).
Read more about this topic: Fort William (Oregon)