Probably no where on the front range. I'd bet your only hope is either out by Lamar or Sterling. I know they have public reservoirs that can be hunted, but I'm not sure which to recommend offhand. But good luck with that, it's a tall order.
As I sit and glass, which is common for hunters out west, I have sort of quickly discovered something I never learned when I was younger.
In my youth I had enthusiasm and spirit. In my middle to advancing years I have creaky knees, arthritis, and I tire more easily than I used to. Where I used to sit on the cold hard ground I now look for that soft spot to sooth my tired muscles. That leads me to my tip.
Carry your soft spot with you!
In my pack I carry an air filled, ultralight, camping pad....