A.V. Watkins Dam SOD Modification Project Contract No. 08-CC-40-8244 (Cement-Bentonite Cutoff Wall) A.V. Watkins Dam Safety of Dams Modification Project Phase 2 Report of Recent Activities Photos of a three mile long slurry wall be installed at Arthur V Watkins dam near Provo Utah. AV Watkins is a 13 mile long freshwater retention dam on the edge of the Great Salt lake. It was built on very weak lake clays and has settled several feet over many years. There was almost a piping failure there over nearer the mountains where a cemented alluvial sequence help up a pipe roof.