Someone recently asked me about the road up to the Forsee Creek TH. I was up there on Saturday. Every car I saw in the TH parking lot was high clearance (although not necessarily 4WD). I took my Honda Accord up most of the way and probably could have gotten all the way to the parking lot but I had 5 people in the car and didn't want to chance it. I just pulled into a turn out 100 or so yds before the parking lot and hiked from there.
The access road isn't very long. One could park along Jenks Lake Road and just walk if one felt uncomfortable driving on the access road or if the conditions were snowy/icy/muddy.