Temperate mountains store precipitation as snow or ice for months to years, creating a crucial lag between when precipitation falls (winter) and when it is most needed (summer). Climate change has already significantly altered—and will continue to alter—the hydrologic regimes of temperate mountain watersheds in various ways, including increasing the intensity of precipitation events, shifting precipitation from snow to rain, and decreasing both the depth of snowpack and the duration of water storage. However, detecting these changes can be challenging because mountains are highly heterogeneous landscapes, and long-term observations are often sparse, unevenly distributed, and absent in most watersheds. Additionally, the impacts of climate warming and hydrological shifts on montane ecosystems are not well understood. Mountain streams reflect changes in the surrounding environments that they cut through and are often monitored more comprehensively than their terrestrial counterparts, providing an opportunity to observe indirect climate impacts in a vitally important ecosystem. We are conducting a long-term, 25-year, trend analysis of stream flow, macroinvertebrate, and water chemistry data collected from over 50 sites in the Upper Green and Snake River watersheds in western Wyoming. Our goal is to identify and test multiple physical, chemical, and ecological indicators of climate change in an area with minimal land use change. We aim to detect both pulse (e.g., rain-on-snow leading to large discharge events) and press disturbances (e.g., rising temperatures) linked to climate-driven shifts. We are exploring potential tipping points in stream flow dynamics that may affect watershed ecohydrologic functions such as water storage and nutrient transport that sustain healthy ecosystems. This study offers insights into the broader impacts of climate change on these critical high elevation watersheds that serve as water towers to lower elevations.