Jurassic Lake is unbelievable!! Huge numbers of huge fish, and the advertising is in no way exaggerating it! I was down there 6 years ago and the fishing gets exhausting, my best day was 67 fish, and everyone else was experiencing the same sort of numbers. I actually tried to find flies that didn't work - small #18 chironomids didn't work, and neither did 4 inch streamers, but everything in between did.
A couple others factors that really help this fishery:
-Very low fishing pressure, the lake is surrounded by private land and the drive in is brutal (the last 40km takes nearly 4 hours in the most rugged pick up trucks I've ever seen).
-One relatively small tributary for all their spawning limits the numbers of fish in the lake.
-Location. The lodge is located right at the mouth of the tributary, so as fish all stack up before spawning. There is good fishing at other locations on the lake, but the Loop / Solid Adventures camp is in the best location.