Be sure to properly slope the finished product and use as much limestone with fines as you can. We have a situation in which a fellow is filling in a steep ditch over a period of years. He actually, sloped uphill from the roadway and with all this rain, the water saturated his 'compacted' dirt and washed a huge gully through everything he added this year. Water drains away from all sides , you should be OK.
Now that I know that clay's texture(platelets) has nothing to do with water infiltration, percolation, or drainage,,, I wonder what does...