Finding Smallmouth In Deep Reservoir

HI,

I live in San Antonio Texas and I understand that Canyon Lake has a decent Smallmouth population. The beauty of it is the fish are not pressured because few people know how to fish for them so I'm looking for advice. I just read an article that was 12 years old that said the fish are usually 30-50 deep most of the year. The lake is usually very clear and is made entirely from a limestone canyon. No docks or other visible cover but there are submerges trees and of course rock everywhere. I've got decent sonar (Helix 5 with Side Imaging). Is it simply a matter of searching sonar for groups of fish in that depth range and drop shot for them under the boat? Are there any other features or groups of features I should look for? Are points better? There is a small river that feeds the lake at the north end and the creek channel snakes its way to the dam where the water is up to 150 feet deep. What would their seasonal movements look like? Forage would be shad and crawfish. Thanks in advance for any and all advice. 

-Danny