Tri County Waiver
There is a Tri County Waiver of the fee if you are just passing thru. If you live in Larimer, Grand, or Boulder counties, and claim to be going to a destination in one of the other counties, they waive the entrance fee. A couple of notes- If you are going to a point beyond the above counties, the waiver does not apply. When the fee is waived, you also do not have the right to use park facilities, and supposedly you may not even stop. That part is not policed and not enforced, however. I think the waiver program may be coming to an end this year, but it was fun while it lasted!