I was up at Norton Lake recently, you almost need a backroads map to find the lake among the maze of logging roads up there.
After turning off the Indian River FSR you drive up the Hixon Creek FSR till you come to a area where the road splits into two, take the left road (rocks are spraypainted pointing direction to Norton) and then travel for a good distance up hill some more and watch for the deep bumps and tire peircing rocks. Make your first right and drive up hill some more (if you miss this right then you'll end up at washed out bridge). Then you need to make a right when you come to a fork in the road.
If you decide to go back up there and search for the lake make sure to watch out for bears. Saw lots of them on the Hixon Creek Road.
Overall its a far drive for a day of fishing, very far as its almost 2 hours away from squamish. Not very far distance but that Hixon Creek Road is the shits.