This thesis explores the possibility of architecture in environmental ruins, through the examination and documentation of a contested post-industrial site: Lower Stony Creek Dam. This thesis asks: through increasing our timeframes of observation, how can architecture exist in the conditions of indeterminacy in which we live today, and what happens to and what will remain of architecture when we are no longer around to use, maintain and care for it? In responding to this, this thesis will propose the design of a series of archival interventions at Lower Stony Creek Dam and will speculate upon the transformation of these interventions over time. Considering deep geological time, this project explores architecture within the entangled temporalities of past, present and future.