Sixtymile River

At the international boundary, it is a rapid winding stream averaging about 20 feet (6.1 m) in width and interrupted at frequent intervals by steep bars covered with only a few inches of water.

The upper portion of the river from the boundary to California creek can hardly be considered a navigable stream even for small boats.

Below California creek, the volume of water increases and the descent becomes less difficult, but bars and rapids continue almost to the mouth and no part of the river is easy to ascend.

The country bordering Sixtymile River forms part of the Yukon plateau, a highland worn into rounded hills and long zigzag ridges, but containing no well-defined and continuous mountain ranges.

Messrs. Arthur Harper & Co. had a trading post and a sawmill on an island at the mouth of the stream, both of which were run by Joseph Ladue, one of the partners of the firm, and who was at one time in the employ of the Alaska Commercial Company.