I'll be returning from Bristol Bay to meet up with a group of friends on the Sept 5th to fish between Cooper Landing and the Anchor River through the 14th. We will be swinging flies, both on single and double handed rods. Probably won't have internet access, but if you contact me via a PM, l'll send you my cell #, if you want to know what was successful for the most part. Silvers should be everywhere. The coastal rivers along the Cook Inlet should have steelhead, but it will be a 4 hour drive for you. You will be driving past quite a bit of good water before you get there.
As for the rivers along the Parks Highway north of Anchorage, only fished them once during king season and it was not pretty, so we have avoided since. Maybe it was just the crowds that turned me off. Reports have been good from what I have read concerning returns of silvers.