Monohon was a small town located on the east side of Lake Sammamish (then known as Lake Squak), near the present-day intersection of East Lake Sammamish Parkway and SE 33rd Street in the city of Sammamish. The community was originally part of a town named Donnelly, founded by Simon Donelly who built a sawmill there, but then grew big enough and was far enough away from Donelly that they created their own town, Monohon in 1888. The new town was named after Martin Monohon who had homesteaded 160 acres (0.65 km2) there in 1877. The railroad along the east side of the lake was completed in 1889, and the Donnelly mill was moved to the site of Monohon.