Hi proskub - thanks for the feedback on my Rhona writing. There's more to come
The Richea Creek route is accessed from the Florentine Road, turning right not far past Maydena. It's a main forestry road, though not well sign-posted. The turn-off leads to both the Styx Valley and the Florentine Valley (though you double back under the main road for the Styx. Don't go that way!) Follow the Florentine Rd slightly west of north for a long way. Eventually the road becomes Tiger Rd, then veers around to the south-west before going over the Florentine River on a small bridge. After another km or so turn left into Range Rd, then wind around until it becomes Terry Walch Rd and then Mother-in-Law Rd. The road gets narrower and I think at some stage it is marked G03. By then it is obvious that the main traffic has been small vehicles as opposed to big log trucks. You'll find the small carpark at the end of G03. (Take the Gordonvale 1:25 000 map. On it look for a westerly spur nearest to Richea Ck.)
The map on the following site is helpful, if neither comprehensive nor to scale.
http://www.touringtasmania.info/images/2007_MARCH/LAKE-RHONA-TRACK-01-A4.jpg You'll know you're at the right place when you see a small wooden "Track" sign. And about 50m into the walk there's a log book in metal box. We took about 45 mins to reach the Gordon River, which can be crossed on a fallen tree. There are pink and yellow tapes marking both the track and the crossing access. After another 15 mins or so you hit the Rasselas Track.
Happy walking (as far as it's possible along the boggy track). And do your best to leave no trace, esp. when it comes to toileting at the lake - ie "Do #2s outside the lake's catchment"
cheers
Peter