After years of yearning I finally made it up to Lake Rhona over Easter - it was a magical experience. The weather was warm and clear, the Gordon River was non-threatening and the mud didn't slow me down too much. Now I can't wait to go back.
Finding the Richea Creek trailhead is straightforward with the 1:100000 map WEDGE and the route was relatively clear - marked by mud when there's no tape. The Richea Creek track is not marked on the Gordonvale 1:25000 though. It took me about 5 hours each way, and about 2 hours to get up Reids Peak and back lakeside.
Lovely walking up above the lake - lots to explore on the Denison Range.
For those that are interested, I've got a few more pictures at https://flic.kr/s/aHsk9guvkK