During our cousin reunion/research, we drove up to Elbert one morning to the old farm where we spent so much time as children. The current owner, who knew my grandparents and parents, is always kind to let us visit, although this is only our second trip since Papa died. On our way out, we spotted this large nest near the water of the stock tank.
Of Texas birds in this area, it could be a Great Blue Heron, or the more common red-tailed hawk. Egrets are also common in this area of Texas, and seem to make more sense over water.