this wouldn't be the first time wyntoon was completely dry, with their houseboats on blocks and docks grounded. i camped at hayward flat every summer from '78-'02. back around '89-'90 (can't remember exactly), same thing happened. in july, water level was down 140' - just a small stream in the covington arm. both ceder stock and estralita docks were floating way out, but access was easy.
but... once you were out on the water, it was bitchin because all the people that didn't want to hike stayed home, and there was plenty of surface to ride around on, well up past captains point. houseboats and pontoons kept at cedar stock and estrellita keep floating, and stay relatively easy to get to.
minersville is fine as a launch ramp once the water gets down around 100' or so. there's plenty of parking with the water down that low. at around 140-150' down, the gravel launch ramp turns into asphalt, left over from an old roadway. the only pain with minersville is the little trail getting through the campground and trees with the boat. the lake's 450' deep (from the tree line), so it's not like it's gonna go dry.
for those that don't know, whiskeytown is fed off the bottom of trinity. there are 2 very large diameter pipes that siphon the water over the mountain... if you look closely at the carr powerhouse on the west end of whiskeytown, you can see those pipes coming down, turning the turbine and emptying into whiskey, which is why whiskeytown is always so cold. from whiskeytown, water is released through kesswick into the sacramento river. most of the water accumulated in trinity from the klamath/trinity watershed ends up in the sacramento...