I would think if you are doing a do-it-yourself Elk hunt you would want the 7.5 minute topographic quadrangle maps. These maps provide enough detail to identify folds in the ground, saddles between canyons or basins, likely water courses -- which depend upon the snow pack the previous year and conditions earlier in the year -- and ponds, etc. Of course, if you are NOT looking at a do-it-yourself hunt your outfitter or guide should know where you are going and then you don't need maps. For flat country, the larger scale, lower detail, BLM maps may suffice. Additionally, you might look into getting a Colorado Gazetteer -- a collection of topographic maps that covers the whole state of Colorado. None of these maps is free, but maps are a hunting tool well worth the investment if you are doing-it-yourself.