St. Francis Dam in Southern California). So I can't resist a bit more today.
I was out in the field again today, taking my students to Yosemite National Park, looking at some dam big rocks (DBRs). The first two DBRs were in the Merced River gorge near Elephant Rock. They are but two pieces of a very large rock fall that took place in 1982. The material in the slide mass (termed the Cookie Slide) totaled around 100,000 cubic meters. The slide closed highway 140 for months, and permanently closed the old Coulterville Road that once existed on the upper slope. I guess I could call these DBRs because if the rock mass had been any larger, it would have dammed the Merced River.
Speaking of DBRs not breaking up, take a look at Leaning Tower near Bridalveil Fall in the picture below. The rock actually leans more than 200 feet over the valley floor. What the heck is holding up that dam rock?