People don't use Danforths in the Columbia because in many of the gravel bars a Danforth style just plows, due to the large size of rock. Danforths are made for mud and sand. In many of the interesting areas of the columbia, the bottom is egg size rock or larger. The bottom in the lower river is sandier, so they would probably work there. Dunno, haven't tried, mine works. The reputed problems may well be due to people using too small a Danforth for all I know. The above mentioned approach is very reliable and the standard method by the regulars. Probably lots of other ways to catch mice, too.

I see a lot of guys recommend lots of chain. A chain leader certainly won't hurt, but, boy, is it heavy... What's the point of trying to use a lighter anchor if you have to use 50 lbs of chain to make it stick?

The only reason I have chain is to provide the breakaway link. I think a lot of chain is perhaps a substitute for lots of rope. Rope is cheaper, doesn't rust, and is easier to pull in.

Best way to find out what to use is to peek in the front of the guide boats.