I grew up living next to the Susky River. As a kid I fished it all the time from ice-out in spring through the fall, and my boots (actually sneakers) never dried in the summer. I knew every rock, current seam, hole, log, eddy and riff in that river and could name some of the fish I caught. I had a good idea where the fish were likely to be and not be at a given time, flow and season.
When I was really young, I fished down the street but also biked up and down the river to hit different areas. At 17 I was driving and expanded my knowledge to other parts of the river. To this day, I go back up to my home river and fish the areas I fished as a kid.
So yes, if you needed to be guided on the River when I was 17, I was your man....errr boy.