In 1999-2000, the Daughters of the American Revolution (DAR) erected four historical markers engraved with journal entries of the Lewis & Clark journey through what is now Washington State. They placed these markers at or near the actual campsites of the exploration party. Some of the sites have supplementary tablets of historical information adjacent to the marker. Two of the markers are near interpretive centers and one is within a park planted with vegetation native to the area during that time period. The DAR coordinated their effort with other states commemorating the trail, to install monuments of similar style.