I've had success with this during the early salmon season as well as the fall and throughout winter. I don't fish for steelhead during the srping, but I've been told by friends that this patterns works during that time frame too!!
I typically fish this fly with a 10ft polyleader in various sink rates depending on the flow. I also use a 3ft-4ft piece of airflo sightfree fluorocarbon in 10lb or 12lb test.
I fish the fly on a down and across swing and hang on!! Tightlines!!