The O’Tooles installed “rock drop” structures to keep Battle Creek deep, narrow and oxygenated – favored habitat for trout. Photo by Phil Taylor.

The O’Tooles installed “rock drop” structures to keep Battle Creek deep, narrow and oxygenated – favored habitat for trout. Photo by Phil Taylor.

The O’Tooles installed “rock drop” structures to keep Battle Creek deep, narrow and oxygenated – favored habitat for trout. Photo by Phil Taylor.