Fishing The Big Thompson River

Have been catching fish on the Big Thompson. It seems like every place I try on the "BT" is filled with fish eager to take a peeping caddis or an adult caddis. One shop owner told me that the Big Thompson was fishing poorly and I should not waste my time there. Of course, that made me want to fish the "BT" all the more. Probably trying to steer anglers away from water he sends his guides to with customers. Joker.