Congratulations on your new toy. I have a Helix 5 DI but no side image or gps but still learning.
I'm sure someone will help you out on the old bridge but wanted to mention a couple things I look at for lake structure.
I look at old topo maps online or a topo app on my phone. They show roads, RR tracks and other possible structure that where there before the lakes. Also show outlines of where the lake currently is.
That combined with a decent contour map you can usually pinpoint some places before you hit the water.
Good luck and enjoy!


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