Launched at 0930. Moved to deep water immediately across from the launch and anchored down. Started with a still water nymph fished vertically on type VI sinking line. Got a few bumps but no takes. Switched to a smaller still water nymph and got the same results. Gents around me were getting 12-14" fish on damsel patterns. After an hour, I saw some very small midges coming off so switched to a size 18 black/silver chironomid. The resulting strikes were fast and as violent as any I've ever gotten fishing this way. Incredible! Three fish to net measured 19-20" range with two others nice ones lost. All takes within a couple feet of bottom. This bite ended abruptly after about 45 minutes. I stuck with chironomids until another hatch materialized and the bite began anew. The sixth fish, upon being netted, flopped around violently and threw 1" blood worms everywhere. Amazing!!! This fish had at least three dozen bright red blood worms in his mouth and throat...most of which ended up in my net. I'd never seen anything like it!!! Switched to a blood worm, expecting to have fully cracked the code. Nope. Only one fish in 30 minutes. Tied on my partners black/red snowcone tied on a red hook and got eight more fish in the next 90 minutes. The fish were still hitting when that large snake, well over four foot long, swam up behind me and passed about 20 feet to my left. Holy #*%@!!! That was it for me, bull or rattler I'm unsure, but 15 fish was good enough and I departed fully satisfied. Only 3 fish under 18" with the largest at 21". The most big fish I've had at any lake this year. All big fish took within a few feet of the bottom, with the smaller fish taking about halfway up. I've spent this whole spring wondering what had happened to the big fish. They're still there!