I guide on the Talachulitna River every summer. It is right next door to Lake Creek. 4 wt for grayling. 6 wt for rainbows and red salmon. 8 wt for coho and 10 wt for king. If you are there in June there won't be any coho but lots of kings. No need for two handed rod. The river isn't that big. Not exceptionally deep either. I can get to the salmon with a floating line and a weighted bunny leech; black, purple, orange. Rainbows will get up and chase salmon smolt patterns (streamers) and if spawning salmon are present, egg patterns. Bring lots of nymphs, stoneflies and mayflies; Hare's Ear and Montana nymphs. Elk wing caddis and Royal Trude dry flies for grayling.