According to the United States Census Bureau, the Trout Lake CDP has a total area of , of which , or 0.61%, are water. The community sits in the Trout Lake Valley, drained to the southeast by Trout Lake Creek which flows to the White Salmon River, a south-flowing tributary of the Columbia River.
According to the United States Census Bureau, the Trout Lake CDP has a total area of , of which , or 061%, are water The community sits in the Trout Lake Valley, drained to the southeast by Trout Lake Creek which flows to the White Salmon River a south-flowing trib.utary of the Columbia River.