Abstract: The Cathedral, as it was popularly referred to in those days (and still is) was inundated by Lake Powell not too long after the Glen Canyon Dam was built and in place (around 1967). By the early 1980s, that sprawling lake backed-up to nearly 200 miles (321 km), and some 125 side canyons and their respective scenic attractions (backcountry idyllic haunts) were covered by hundreds of feet of water. That compelling story is outlined in the original text published last year, depicting the before, during, and after phases relative to building the dam. In the sequel, the focus was entirely set on the most revered scenic icons of the Glen and meant to inform the reader what was sacrificed when the Bureau of Reclamation targeted Glen Canyon for the first large dam to be built in the upper basin of the Colorado River. Unfortunately, and some fifty years later, Lake Powell's environmental problems with continuing and unstoppable aggradation (i.e., sediment in-flow) has severely diminished the originally predicted lifespan of its basin (around 700 years), and likely this second largest artificial basin in America (next to Lake Mead being the first largest by volume) will last sixty or seventy years. The reason is that there is no feasible or economical way to remove the accumulating grayish gunk on the bottom of the lake. Again, that story is revealed in its entirety in Glen Canyon Before Lake Powell. Incidentally, Lake Mead's basin has already failed, and the fervor of the Bureau of Reclamation is to increase the basin's seriously diminished levels. Then again, Lake Powell showed similar signs by the early 1990s. Hence, the lake level is well over one hundred feet below the so-called full pool level of 1982. The "Cathedral in the Desert" text relates the essentials of what happened here, including human and natural history. Mostly, the text describes the incomparable beauty of this canyon niche's environs. The text also describes the before and after phases, including The Cathedral's unexpected appearance when the lake level dropped some 145 feet (44 m). That rare and serendipitous event happened in April 2005, and for a couple of weeks visitors, like myself got to see The Cathedral fully revealed. Hence, a complete view of its magisterial setting from the floor to the upper reaches hundreds of feet above this veritable shrine of the ages. Toward the middle of the month, the water level of the lake slowly elevated and toward the end of the month this peerless Glen Canyon shrine of the ages was, once again, engulfed by cold, clear water.