There are a couple problems with Button Rock. One, the distance from where Tim and I live. It isn't horrible. A half an hour is doable if you don't have much else going on. BUT be prepared for 1+ hours sometimes because of traffic headed into the mountains. And tourists drive so slowly.
Also, you have to walk about 2 miles to get to the actual dog off leash area, which normally isn't the end of the world either. You do have to consider the fact that you really should be out of the mountains in Colorado before 1 o'clock or so, due to the storms. So factor the time it takes to actually walk to the off leash area before you head out for the day.
Plus, Button Rock is one of the very few places that allow dogs in Colorado, off leash or not. Therefore, it is a very popular spot, and boom, just like that you basically have a dog park up in the mountains instead of in the city. The few times I have actually let my dog off leash up there, she has been accosted by other ill-behaved dogs also off leash. I now don't even go there because of how bad it has gotten.
Basically, we don't have any options for letting our dogs off leash in Colorado. The few places that do allow it are completely swamped with dogs. The laws are extremely strict here, and we cannot get away with allowing our dogs off leash in churches, parks, school yards, or ball fields. It just doesn't work.
Forrest - GSD 9/1/2016 - 5/14/2017 RIP
Brooklyn - Golden retriever 1/30/11