Isabella McCormack (sometimes known as Isabel, Isabell or Isabelle) was a sternwheel steamboat that operated in British Columbia on the Columbia River from 1908 to 1910.

Isabella McCormack was built at Golden, BC by Alexander Blakely for the Columbia River Lumber Company, and was intended to be a replacement for Ptarmigan.

[2][3] Isabelle McCormack was placed on the Columbia River route that began at Golden and ran south, at least during high water, to Columbia Lake, the ultimate source of the Columbia River.

While the vessel was the fastest steamboat on the route, she was not a success.

[3] In 1910 Isabella McCormack was converted into a floating houseboat and hotel.