Dan,
I will give you a couple tips about fishing Glenn Springs. Throughout the summer, when the grass mats on top, it is time for 2 presentations: Hollow body frogs/mice & punching.
Troll from mat to mat listening for the bluegill feeding (crackle & pop sound). When you come on one of those, toss your frog next to any timber you see in the mat and also look for irregular lines in the mat (where 2 different grasses meet). I get many strikes in these areas. I will also punch these mats. Again, looking for timber in the mat, irregular grass lines, & holes in the mat. I promise you will increase you numbers by doing this alone.
Once I am done with the frogs & punching, I head to the creek channels & drop-offs. Everyone I see out there beats the bank. You can catch some by doing this, but you will be MUCH more consistent if you use your sonar to find the drop-offs & creek channels.
If you are standing on the pier looking across the lake, there is a big main lake point directly across from you. That cove is a spawning cove & has a creek running from the back of it to the main lake. Depending on what stage the bass are in ( pre, spawn, or post) depends where on that creek they are. The hotter the weather, the closer to the main lake they will be. Where the creek meets the main lake, there is a huge pile of submerged timber. There are almost always bass stacked in & around that timber (it sits on the edge of a drop-off to deep water). Work the cove well & you will find fish.
Looking from the pier again, There is one other main lake point to the left of the one I just discussed. That point runs about 30-40 yards underwater. It runs to about 15-20 fow (depending on the lake level). at the 10-12 ft mark, there is a stump field. I catch many bass on jerkbaits & crankbaits in that stump field. Crash you cranks into the stumps & you will get bit. That stump field sits right on the edge of...you guessed it...a drop-off. In between those 2 points, there is a small bluff wall that drops from 5-8 fow to 15-18 fow. There is a grass bed on top of the wall. There are many bass that feed on top of the wall early & late day then drop to the bottom of it midday. Jerkbaits & jigs have been the bet for me in this section. See the point I am getting at? Find the drop-offs...find the bass.
Along with these areas, there are a few humps just south of the dam that hold fish in the summer. They sit in 20-25 fow & rise to 10-15 ft. Use you sonar to find the drop-offs Then work them good & I bet you will start catching more bass. I always hear people say they never catch anything out there, but I always catch good fish out there & I'm definitely no pro!
I live 10 min from there & fished it often until I jacked my arm up. I should be able to fish again by mid June. If you like, we can meet out there then & fish together once I heal from my surgery. I hope this helps you some! Good luck!
Carlton