Because these insects in pupal and winged form represent the principal diet of freshwater trout, the fish living in spring creeks often have ample food supply throughout the year. This element of spring creek habitats, combined with the advantageous water conditions, can create the ideal conditions for large, healthy, hefty local populations of the kind of trout that fly fisherman pursue. Some examples of spring creeks famous for their fly fishing conditions are the Henrys Fork, in southeastern Idaho, the Silver Creek, in central southern Idaho, and the Metolius River, in central Oregon. In this context, fly fisherman often refer to creeks and rivers as "like a spring creek" if the water flows and habitat display the characteristics described above. See also Aquifer Surface runoff DePuy Spring Creek References Rivers Springs (hydrology)