At that time of year, the Battenkill has a ton of tubes, canoes, and kayaks floating down, so the fishing can be iffy. If you're there midweek though, give it a try. I'm a big fan of the Metowee and Poultney Rivers. There's a lot of wild fish, and if you go far enough upstream, you'll always find cool enough water to fish. The tricos should be popping pretty well by then, and the first week or two of that can be spectacular there at the right time of day.