The first EuroAmerican settlers in the Rainier Valley located in the south part of the valley. E.A. Clark in 1852 and David Graham in 1853. Walter Graham eventually acquired his brother David's land and purchased the peninsula that is today's Seward Park. Wetmore Slough, which extended south from the approximate location of today's Charlestown Street to Genessee Street and west to Rainier Avenue, was named for Seymour Wetmore who came to Seattle in 1857. Wetmore homesteaded in the Rainier Valley, and his land was near today's Rainier Avenue and Charlestown Street. He was the first to settle in the northern part of the Rainier Valley. In 1870 Seymour Wetmore captured a large cougar on his farm that was later exhibited downtown (The Weekly Intelligencer, February 28, 1870, 3). Seymour's son Frank purchased property on the west side of the slough.
—North Rainier Valley Historic Context Statement, by Caroline Tobin, May 2004.