Photo #24092 - View from highway - Photo - Lewis and Clark National Historic Trail highway marker sign North Dakota Highway# 1804 is part of Lewis and Clark National Historic Trail. Most of the Lewis and Clark National Historic Trail, follows the Missouri & Columbia Rivers. Much has changed in 200 years but trail portions remain intact. At 3700 miles, Lewis & Clark NHT is the second longest of the 23 National Scenic & National Historic Trails. Pick up the trail of America's greatest legends in North Dakota, and you'll find yourself in a legendary adventure of your own. Lewis and Clark, Sakakawea, George Custer, Sitting Bull and Theodore Roosevelt lived out larger-than-life adventures here. Whether you follow in their footsteps and rediscover the past or blaze your own trail and discover what makes North Dakota legendary today, you'll find wide-open spaces and wide-open fun!