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GRAND TOWER, Illinois (AP) -- In late 1803, Capt. Meriwether Lewis and William Clark went largely unnoticed as they navigated more than 1,000 miles on the Monongahela, Ohio and Mississippi rivers en route to where their historic expedition began near St. Louis. Two hundred years later, volunteers with the Discovery Expedition, a living-history group based in St. Charles, Missouri, have spent more than three months retracing that forgotten leg of the trip -- with a lot more fanfare. The group was expected to arrive Friday at the historic departure point in the town of Wood River, across the Mississippi from St. Louis, passing this river town in the state's far southwest along the way. The re-enactors are led by Scott Mandrell, who portrays Lewis. Like Lewis, Mandrell keeps a detailed journal of his travels. Unlike Lewis, Mandrell has a laptop. "After 200 years of this story living in the shadows of American history books, it is exciting to be a part of the effort to expose it to the light of day," said Mandrell, a school teacher in the St.