There is a big chunk of DNR land close to Thompson creek.
to get there head north on starr road about 3.7 miles.
Turn Right on east hauser lake road for about a mile
keep right at the fork in the road for another half mile
turn left on N. Koth road after about half mile its state land on either side of the road.
There is only a few roads and there all gated but when you get to the top where it flattens out there are a few place where you could setup a camp off the side of the road.
From there the easiest way to Thompson creek is drive back down to east hauser lake road and take a right on Muzzy rd. that will take to the back side of the lake where Thompson creek road is.
Hope that helps.