Lewis and Clark Trail State Park is five miles west of Dayton on US HWY 12. The Corps passed here during the day on May 2, 1806. They bivouacked that night a few miles west of Dayton (See previous pages).The Touchet River flows west, above. The sign, left, tells the story of the Expedition's overland journey east over the "Forgotten Trail." The Lewis and Clark Trail State Park is divided by US HWY 12. The north side has the campground and a trail along the Touchet River. The south side has the picnic grounds and the majority of the Lewis and Clark Trail signs in a kiosk near the restrooms. If you want to catch some of the lower Snake River Lewis and Clark campsites, you could take WA HWY 124 west at Waitsburg.