A couple of years ago I was fishing the Delta with Mike Reynolds. He was the first to show me the open water frog bite. He would cast the frog up against the tules and let it slide down them into the water. He said that if you were to cast the frog and let it splat directly on the water, the bass would run for cover, but if you could glide it in like that you'd have a chance. Sure enough, he got some nice fish that hit the bait seconds after it slid in next to the tule patches. He told me that he'd rarely get a "second chance" if they'd miss the bait, unlike grass mat fishing, so patience on striking the fish was important. The Delta gets these nice tidal troughs along the tule banks that these bass will lay up in, even on a low, slack tide day like we were fishing. This particular trip was in May, so the grass had not really began growing to the surface yet. I've since been able to get on open water frog bites all over So Cal.
Anyhow, the falling water(tidal,or whatever) will reposition fish, but frog fishing may not totally go away. Gotta get to the Delta this summer!!!!!