Unless the weather has changed, water flows are significantly low in Alaska this year. Depending on where you fish, Quartz will be small water.
I wouldn’t get your hopes up to much on Quartz. While it used to be the place to go for catching dollies, it now gets so much pressure that the fish have been caught several times and will openly refuse beads. In one recent trip, I counted 3 guides passing by as I hiked out. One with a group of three people, hiking a one mile section, in water no wider than 10 feet across. Welcome to the new Alaska road access fisheries.
A bead head pheasant tail nymph can work really well for Alaska dollies. And I’ve always fished a six weight. Single hand on Quartz.
I’d certainly give Quartz a shot. It’s a beautiful stream and does have the possibility to sight fish.
There are bears, especially near the Russian.
As for the Kenai, similar to Quartz, the rainbows this time of year receive an extreme amount of pressure. With that said, you may have to play with different flies. I have seen some great blue wing olive hatches. Don’t forget flesh flies.
Hiking up the Russian can be good too. If it’s plugged with sockeye down low, fishing the upper is a pain due to incidental snagging. LOTS of bears on this stretch. They all see plenty of humans but it only takes one startled bear to make an encounter turn hairy.
As for swinging flies, I’d consider that the rainbows are intermingled with sockeye. You will snag the hell out of half dead salmon trying to get to a rainbow. Nymphing is much more productive and easier to fish. Besides, you’ll find fish running shorelines.
Post pics and a report!