With the main early-season stonefly being the golden stone, it's important to have a few of the adults in your box. But, as with mayflies, you may run into a skwala hatch, or other type of stonefly.

Also, stonefly nymphs are found on the stream bottom rocks in various stages of development and nymph patterns are typically fished successfully year-round on waters that have open regulations.

Sports Outdoors Yakima River stonefly action ready to peak, fly fishing guides say Wed., July 3, 2013 Summer stonefly in the Yakima River. (Red's Fly Shop) ...

Photos by Steven Nehl/The OregonianThis salmon fly has just emerged from its nymphal case Friday along the shore of the Deschutes River at Trout Creek. Fly fishermen looking into the grass and ...