My husband and I visit Arizona a lot to see his grandparents, so this is a little lake we passed while there. The sediment deposited on the banks are sand and pebbles.
Because the water doesn't move very actively, I think the sediment would be only lightly sorted. I don't think the sediment gets moved around very much. Even so, I would assume the grains to be somewhat rounded.
This environment is a low-energy environment. The hills break up the wind, and there aren't any waves on the water. Any sedimentary rock would likely be conglomerates, where pebbles are cemented together with sand.
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