John Petranka, Sally Gewalt Ashe, 2017-06-20, South Fork of the New River at Twin Rivers Campground. Flying fast and low over riffles, flying upstream to pool and repeating that flight pattern. - One male photographed in very low light. Unsure of sex of others. First noticed activity at ca. 8:30 PM (may have begun earlier). Activity ended abruptly at ca. 8:50 PM. Sunset was at 8:46 PM.