Sangamon River
a river in Illinois formed by the North and South Forks, the former being the main branch.
Its source is near Gibson, whence it traverses Champaign co., where it turns W. and crosses Sangamon co., and forms the N. boundary of Cass co. It flows into the Illinois river about 9 miles above Beardstown, and 45 miles W. N. W. of Springfield. Its length is 250 miles, including the North Fork. The forks join 6 miles E. of Springfield.