Instead of going into the park, we went south from C470 on Wadsworth to park at the Audubon Nature Center on the east side of the Wadsworth. It is just past the turn in to Lockheed Martin. Follow the parking lot to the left and to the back. There is a trail head there as well as a restroom and a decent amount of parking. No fee was required from this entrance.
The footing was very good and the setting gorgeous. We went right at the start and looped back around to the parking lot for about a 2 hour ride. Several water crossings including part of the Platte River. Rivers, streams and small lakes. A whole different view of Chatfield! Not the part of the park you are probably thinking of. Gorgeous ride!