Challenge Cost Share Program (CCSP) Through the CCSP, the NPS and partners work together to preserve the Trail. more...
Site Certification More than 120 certified sites are found along the Trail. Learn more about site certification. more...
Did You Know?
Two hundred years after the Lewis and Clark Expedition, the only physical evidence of the journey is found near Billings, MT. In July 1805, William Clark carved his name into the soft rock of what he called Pompeys Tower. This site is now preserved at Pompeys Pillar National Monument.