Chariton River, c.280 mi/451 km long, N Mo. and S Iowa; rises in S central Iowa; flows SE and S to Missouri R. above Glasgow; mostly channelized in Missouri with a new mouth on the Missouri R. 10 miles above its natural mouth. Before channelization, it received East Chariton R. (or East Fork), rising S of Kirksville, Mo., and flowing c.90 mi/145 km S and SW. East Fork now has its own mouth on Missouri R. East Fork has Long Branch Lake reservoir; Thomas Hill Lake (reservoir) on Middle Fork, a tributary of East Fork.