From Safeguard the Gateways of Alaska: Her Waterways. USGS Special Publication No. 50, 1918.
A marine court of inquiry was convened in Seattle to hear testimony concerning the accident.
The reef where the ship struck was named Yukon Reef in honor of the lost steamship.
At about 6 p.m. on June 11, 1913, the steamer Yukon, bound from the Kuskokwim River to Seattle, stranded in a fog on the northwest end of Sannak Island, south side of the Alaska Peninsula, and became a total loss. The facts later developed showed that the vessel, approaching Unimak Pass from northward in a fog, had made land the previous afternoon which was supposed to be Akun Head, on the southwest side of the northwestern entrance to the pass, but which was actually Ugamak Island, on the south side of the southeastern entrance to the pass. The vessel had, therefore, unknown to the master, been set entirely through Unimak Pass by the current. The master, assuming that he had made land on the northern side of the pass, shaped his course to lead through the pass and