Lake Sacajawea is a man-made lake in Longview, Washington. It is named after the Shoshone woman named Sacajawea who guided Meriwether Lewis and William Clark during their expedition to the Pacific Ocean. The lake is made up of four sections, each separated by a bridged road. Several small parks are part of the larger Lake Sacajawea Park. Lake Sacajawea Park is a 67-acre park in the middle of the city. The lake's water is pumped into the north end from the Cowlitz River and flows to the south end where it exits into the Columbia River.