Couple hear possible knocks while fishing one morning near Lyme witnessed in Middlesex County, Connecticut

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On July 3rd, 2016, at around 7AM I was fishing at Norwich Pond in Lyme, CT. I caught my first fish within minutes of arriving. When I brought the fish to shore I heard 3 distinct knocks coming from behind and above me. There is a rather steep, high (30 ft?) slope along the access road near the boat ramp. I turned around thinking it was people walking down the road. Nothing there... I threw the fish back and recast. I caught another within a few minutes. As i brought this one to shore, I heard another 3 distinct knocks from the same spot and again turned around to see if someone was there. No one! This boat launch/pond is about 4 - 5 miles in from the main road and the only houses around were on the other side of the pond, the opposite direction of the knocks. I am pretty sure it was an encounter with Sasquatch even though I did not see or smell one. The knocking was too "human" to be an animal and there were NO people around.