‘SEPULVEDA WATERBASIN: A Climate Park Mediating Between Extremes’ centers the Los Angeles River in its design process and aims to initiate a spatial framework to respond to climatic challenges. Sepulveda Basin is a 2,000-acre public facility designed for flood management with 8 miles of the river running through its center. The site proposal is designed using the cyclical timeline of daily recreation and extreme weather events to maximize its potential to serve as a community resource. The existing landscape creates an opportunity for a socio-ecological approach that leverages natural river processes to create a self-sustaining habitat while providing relaxation, recreation, and greater flood relief to the urban region. Regenerative wetland habitats and stormwater detention ponds reduce flood hazards to adjacent communities. The ponds activate the programmatic structures: the LA River Bridge Museum and the Climate Futures Resiliency Lab, two community programs that interface with the open-air recreational zones and the river through a network of trails and elevated paths.