I fished Rock Lake for the first time this year in a jonboat with an electric trolling motor. Seemed like most of the guys fishing the lake headed up to the north end, but I didn't have enought horsepower to get that far on a couple of batteries. I had a fishfinder and was astounded to mark virtually no fish for the first 4-5 hours of trolling on both sides of the southern third of the lake. I even made my way downstream from the lake under the highway and came up empty. I finally marked some schools about halfway up the lake on the eastern shore. Started catching fish about 3 PM. Came home with a 14 inch brown, a 14 inch rainbow and a fat 20 inch rainbow. Beautiful red meat. Delicious.