Pemberton’s Fishfinder, Brad Knowles, reported last week that Anderson Lake is now seeing sockeye entering the lake in large numbers.
The sockeye make their way up the mighty Fraser River to Lillooet, then they hang a left at Seton River, and continue through Seton Lake, to stage in Anderson Lake.
The run lasts about a month, until they’ve all spawned in Gates Creek, which has a natural spawning habitat and a spawning channel.
Trout follow the sockeye salmon in anticipation of the spawn – tasty treats for the trout to eat.
Which means that the rainbow trout fishing is good right now… and the salmon sighting is prime.
The Wellness Almanac 
I was there Aug 11&12. No fish in the Gates River system, but a few schools of sockeye porpoising around in the morning, then gone all day/evening. I didn’t see any making their way up.