Long Lake is a freshwater lake located in Thurston County, Washington, United States. It is located approximately 5.5 miles east of Olympia. It consists of two basins connected by a narrow neck. It is two miles long and has two islands, Holmes Island and Kirby Island. Long Lake is fed by Pattison Lake and drains via Himes/Woodland Creek and Lois Lake t…Long Lake is a freshwater lake located in Thurston County, Washington, United States. It is located approximately 5.5 miles east of Olympia. It consists of two basins connected by a narrow neck. It is two miles long and has two islands, Holmes Island and Kirby Island. Long Lake is fed by Pattison Lake and drains via Himes/Woodland Creek and Lois Lake to Henderson Inlet. Long Lake was given its descriptive name in 1853.