Possible sighting and tree shaking on S. Fork American River 30 miles NE of Sacramento witnessed in El Dorado County, California

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I was very hesitant to make a report, but was encouraged by a friend. So here it is. I am an avid equestrian. I am now in my 60's and ride strictly for relaxation. I trail ride 4-5 days a week. The area I ride is a large rec area called Cronan Ranch. It is strictly for bikes, horses and hiking with miles and miles of trails. No motorized vehicles allowed. The American River borders the rec area. When I ride I almost always go by the river to give my horses a drink. For hikers/day walkers this particular river access point is the closest to the Pedro Hill trail head parking lot. But still a long walk to the river with the return being all uphill. In the summer you will almost always find people at this access point enjoying the river. There has been since I have been riding here over the last 3+ years a picnic area with several large heavy duty wooden picnic tables. It is a awesome spot with shade and pit toilets nearby the tables. But it is a tough trek for the average pers...