Casting a Mepps Spinner at Round Valley Reservoir in Direct Sun

Casted a Mepps #3 spinner for an hour in 83-degree warmth at Round Valley Reservoir, walking the shoreline and concentrating at two small points where deeper water is close. With so much light penetration, I didn't expect a hit and none came. I put an eighth-ounce egg sinker ahead of the spinner so I could cast farther, let it sink to bottom, then retrieved it deep. The reservoir remains very cold, of course. This evening should be good topwater bass fishing for any who want to try a pond with water temperatures around 60 or warmer. But with Round Valley's depths, water temperatures were somewhere in the 40's; I wasn't thinking bass at all.