No, that's ridiculous! I've never heard of such a thing! :
Seriously, I have, but I think it's a right time/right place scenario. I've never hit them right. I keep hearing all this great stuff about the Lehigh, but my personal experiences there haven't lived up to the hype. Part of the reason for that hype is to get more favorable releases from the FE Walter Res that would maintain survivable water temps throughout the summer. Not that there's anything wrong with that - there's tons of cover and suitable habitat and it could be a hell of a tailwater fishery.
For now, the state and the Lehigh River Stocking Association stock the hell out of it. There has to be some in there, but I doubt it's loaded with monster spawning trout.