Go to the gymkana grounds at mile 200 trail leaves from there. Old Shell oil road takes you right to the prophet. If it's wet it is a really bad trail several miles of muskeg going across the minker flats til you hit the prophet. Prophet has some tough crossings when the water is high. Best wait til river drops after spring run off. Be careful if you haven't haven't much experience with muskeg and high water that can be a tough trip.
I would like to go in some day as well. Where exactly is minter flats? Is the trail okay passed that point?