The northeast shore of Lake Tahoe is relatively undeveloped. On an early morning, I stopped at the Lake Tahoe Nevada State Park visitors' center. The shoreline at this part of the lake is a jumble of massive granite boulders with occasional sandy areas.
On the little nature path between the visitors' center and the shore is this boulder containing at least four mortars. I dug the sand out of one. There was nothing mentioned about this in the path guides.
Later in the morning, I rented a kayak at the Sand Harbor boat launch and followed the shoreline to beyond the visitors' center. This is what a saw just a few steps north of the boulder with the mortars: a massive boulder propped on two stones.
Here is another view.
As I returned to the boat launch, I was thinking it was coincidence that a mortar was near a boulder resting on two stones in the jumbled pile. Then I saw this sight that convinced me there were deliberately made stone structures at Lake Tahoe.
I will show this large site in the next post.