The only place I dove was at the campsites on South shore. I forget which campsite number we liked. There are a few right on the water.
The lake slopes down gradually to about 30 feet, then drops into a 60 foot trough about 50 feet from shore. It's dark and mucky down there. Tons of algae and such, especially as the water starts to warm up. Visibility in the shallows was better. Not good, but better, maybe 20 feet plus. We dove there throughout the early spring and noticed the visibility decreased and algae increased every weekend.
It's not a great dive. I was preparing for a class with friends from Sacramento. Camanche was a convenient place for us to meet. There are some big catfish, bass, and crawdads. That's 'bout it. Not a bad place to hang out, though.