E. dB, I do some stocking in CO. The west slope has a lot of restrictions on what species can be stocked, especially with in-flow/out-flow. If you want to message me on your location, I can give you particulars on what can be stocked and what can't.
The Northern CO hatchery I work closely with does some stocking on the west slope and permits for some areas have to be obtained in advance.
Now, determining what needs to be done will require some sampling to include types of fish present and weights/lengths of those species to make a more educated decision on what needs to be adjusted to better meet your intended goals.