You make a right turn, just off the freeway and drive down to the turnout. You will see portable restrooms on the left and the trails are straight back and to the right. This trail is for Cross-Country and Snowshoe. You are supposed to have a Park and Ski Permit from what I could tell. No sign where we were and did not realize till later and were not parked for more that about 1 hour.
Here is a link with more info and you can get some maps: 4th of July Pass Area
Fun day out trying our snowshoes for the 1st time in my life. Never too late and here are a few pics of the area. Not the best of pictures due to using a camera phone