https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/lakes/rattlesnake-lake/rattlesnake-lake.md
On the west side of the Cascade Mountains, two lobes covered the Puget Lowlands. Along the north side of the Olympic Mountains the Juan de Fuca Lobe moved west, and between the Olympics and the Cascades the Puget Lobe moved south.
Rattlesnake Lake (Wikipedia) Rattlesnake Lake is a lake in the northwest United States, located in Rattlesnake Mountain Scenic Area in King County, Washington, approximately thirty miles (50 km) east of Seattle, south of Interstate 90.