Here, you may have to contend with drops and boulder fields. For extended trips, topo maps are valuable for picking out a campsite in advance. Look for a flat area indicated by widely-spaced contour lines that are high enough above the waterline to prevent flooding. The view from camp, drinking water sources, and even orientation to the morning sun for drying tents can be considered before the trip begins. Often, a good campsite may not be visible from the river, but are evident on a map.
Many power plants have small dams that diverts water into their cooling intakes.
Keep in mind, however, that 1928-vintage USGS topo maps still exist and may poorly represent modern conditions of a riverway. Topo maps may be obtained for most areas from the United Sates Geological Survey. In addition, larger universities are often map depositories and will have most topos of the United States and Canada that have been published. Call their geology department about using these maps for reference. Aerial photos, some with contour lines drawn in, may be available from your local water conservation district or county planning office.