The Sammamish River valley from Lake Washington to Issaquah Creek was home to the Sammamish, a Coast Salish people numbering perhaps 80 to 200 around 1850, whose main winter village stood at the mouth of the river between today's Bothell and Kenmore. They resisted removal but after the Puget Sound War of 1855 and 1856 were sent to Fort Kitsap. Some stayed and worked as laborers and farmers, but their village was later destroyed.
More about Bothell
The first Homestead Act claims in Bothell were filed in 1870 by Columbus S. Greenleaf and George R. Wilson, an English immigrant, on neighboring land along the lower river, then called Squak Slough, which was mostly marsh and had not yet been surveyed. Eight families settled in the next six years. In 1877 the Canadian businessman George Brackett began logging 80 acres on the site of today's Wayne Golf Course and set up Brackett's Landing, with a sawmill and a steamboat dock served from Seattle and Issaquah.
In 1884 Brackett sold 80 acres of timberland to David Bothell, a Civil War veteran from Pennsylvania, who with his two sons built a house and shingle mill the next year and later ran a boarding house with his wife. After it burned it was replaced by the Bothell Hotel elsewhere, and the townsite was platted on April 25, 1888. The first postmaster, Gerhard Ericksen, who bought the boarding house property, named the town for the Bothell family. It then had two hotels, several lumber mills and a school, and it set up its own school district in 1885.
Sources
Wikipedia: Bothell, Washington