- Squak Mountain is the second most westerly mountain of the Issaquah Alps mountain chain in Washington state. It is situated between Cougar Mountain to the west and Tiger Mountain to the east. Interstate 90 parallels the base of the north side of the mountain. Much of the Squak Mountain watershed drains into Lake Sammamish. Most of the mountain is protected by Squak Mountain State Park and the Cougar/Squak and Squak/Tiger Corridors of King County.