I was there fishing the same general area too on Sat. afternoon with a laaate start.....water level was kind of high keeping our bigger boat (w/ high windshiel) from passing under the bridge to fish the bridge pillars & the little bay where most boaters, including yous I believe, were

The riverside dirt ramp was not for us and the South Simcoe Marina's ramp was under repair, so we had to launch out of a distant marina... fished some familiar locations along the river and worked our way back to the bridge without any success....finally got some fish off of of the public dock....fish were hugging to slip ruins and deep down....saw others getting fish too from shore & off boats under the bridge but not in respectable quantities...

I believe the big run is pretty much done now...but the bidge pillars will still hold fish for a while....but not all pillars hold fish, only early birds can entertain .....rig up a shorter rod w/ slip float for better casting with limited headroom in there...when fish are sticking to the bottom, just take off the float drop the lure to the bottom and work the rod left right slowly to entice fish bites...good luck!