Quiver Lake has parts that should also be mapped. Lake Chautauqua is the main part and is divided into the North Pool and South Pool. To the North is Clear Lake.  See https://www.fws.gov/uploadedImages/Region_3/NWRS/Zone_1/Illinois_River_Complex/Chautauqua/Sections/Maps/CHT-NEWmap.jpg and https://www.illinoisriverroad.org/places/united-states/illinois/havana/nature-outdoor-recreation/quiver-lake/