Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Mount Fulcher is an unincorporated community in Logan County, Illinois, United States. Mount Fulcher is located along Interstate 55 and former U.S. Route 66 northeast of Williamsville. "Mount" Fulcher is an end, or terminal moraine, a deposit of rocks and soil left by glaciers at the end of the last ice age. This large natural moraine was greatly reduced by the cutting of the railroad right-of-way between 1853 and 1945, and later by the cutting of right-of-way for the successive highways Illinois Route 4, U.S. Route 66, and then U.S. Interstate 55.