no there are no maps for arcadia that show the brushpiles, there are maps at the park office of the lake but they don't show any topography.
there are a few brush piles in the cove west of the spring creek ramp, they have markers or you can see the brush coming out of the water, there is another brushpile by the dam in the last cove before you get to the dom on the south side, there is another brushpile on the north end of the dam where the bouys are marking the drawdown, the northernmost bouy that angles down into the water marks the spot. i hope this makes sense, there are many other piles out there that you can only find with a scope.