Finally got it! I'd been using Photographer's ephemeris to track the sun's position from this spot from time to time over the past year, and I did at one point determine that today (and the days around it) would be perfect...but I had forgotten. Luckily, I decided to stop by chance today and the shot that I had been really wanting to see at this position was finally here, and it looked cooler than I thought it would. This is with the Panasonic GX7 and is a 6 image stitch with the Olympus 75-300mm @ 75mm. Such glorious light, and the mist rolling off the river made it even better.