Harris Park is just north of Bailey when you hit the top of crow hill you head north about 12 miles. It is about a 45 minute drive from Denver the only problem is you cant get to the range in a car you need a 4x4. There is a solution to this you can get with in a 1/4 mile of the range and there is a big open area to park and everybody can pile into the 4x4's for the last 1/4 mile.
When I say you need a 4x4 I don't mean it is really nasty hard core 4x4 it is just bad enough that a car will not cut it. I go there all the time if it is dry in my truck in 2 wheel drive you just need the ground clearance.