Between 1804 - 1806, a band of 33 hunters, scouts, and translators (including Sacagawea, her French-Canadian husbant Toussaint Charbonneau. and their infant son) and one Newfoundland dog named Seaman, collectively known as the Corps of Discovery and led by Meriwether Lewis and William Clark, traveled approximately 4,900 miles over 16 states to the Pacific Ocean. This trek is now known as the Lewis and Clark National Historic Trail.  Upon their arrival at what is now Washington state, they followed the course of the Columbia River and recorded their explorations of the river, meetings with the area Native Americans, and the landscape all along the way. Many of the sights you may see if you follow in the Corps' footsteps along the Washington state portion of this national historic trail are now located in Washington state parks. Many sights, though, Lewis and Clark would never have seen or even dreamed of (museums, commerce, large ships plowing the river water).