The Olentangy River rises in northern Morrow County
in north central Ohio and twists in a generally westerly direction through Galion
before turning to the south about 5 miles west of town. It then flows past Waldo before emptying into Delaware Lake
. Upon exiting the dam it continues south through Delaware
joining the Scioto River
A stretch of the river below the dam, popular with canoeists and kayakers, is central Ohio's only state designated scenic river.