no, well i dont think it has shad ive seen very little in the way of bait fish
the way the trout grow in there, they seam to be doing fine lotts of bugs for them to eat
i dont see how run off could really affect this lake there aint much upstream that might run into the lake shure the valley has a lot of hay and cattle production but nothing like the potential of other lakes that drain so much larger an area the lake does have dramatic fluctuations in size every year ill have to check into that some see if i can find out more.
i know the ark used to have heavy metal problems and that reduced the life span of the fish makeing it so they coulnt grow that big before they died but they have cleaned up the sources near leadville and predict the return of big fish to the ark. but havent heard about grape creek, whitch is what fills deweese thanks for the heads up