Swampy Plain River (lower)

The best fly fishing is often in the warmer months when flows out of the dam are quite high. Getting nymphs with a fair bit of weight down deep to trout lying behind gravel banks or along rock walls, where the flow is slowed somewhat, is a very productive way to pickup some surprisingly large trout. An indicator rig with a long length of tippet to achieve depth is a common approach, but dry dropper is also effective with a large, buoyant dry on top often attracting the very aggressive rainbows to the surface.
Late afternoon and evening hatches of caddis and Kosciuszko mayfly can be prolific on this water in summer and early autumn, where at times it would seem that every fish in the river is feeding off the surface. Larger buoyant caddis or sedge patterns are great for caddis while a large March Brown dry fly is a popular goto for Kosi dun feeders. In softer water, don't be afraid to go smaller and more subtle including smaller cdc caddis patterns and mergers such as a Shaving Brush.
Summer hopper fishing can also be a highlight, with fish often happy to rise through fast current to take large hopper patterns off the top. There our plenty of yellow winged locusts around so foam patterns such as the Madam X Hopper are perfect for the turbulent flows or a large stimulator. Rubber legs reputedly make a difference in drawing more fish up.
In high flows you are often fishing across varying current speeds, so mending is critical to reducing drag.