ABSTRACT
The upper Salt Creek drainage and adjacent interfluves (Figure 6.1) encompass parts of DeWitt, McLean, Macon, Logan, and Piatt counties in east-central Illinois. The topography is flat to gently rolling and is broken only by small stream valleys and the low ridges of end moraines. The major topographical features reflect the landscape-molding forces of the Illinoian and the Wiscon-sinan glacial advances and retreats. The uplands are till plains covered by loess. Salt Creek provides the major drainage and is characterized by a narrow valley and relatively insignificant terrace development.
