McKinney Falls limestone ledges and creek falls

McKinney Falls State Park showcases two waterfalls where Onion Creek flows over resistant limestone ledges, creating the park’s Upper and Lower Falls and attendant plunge pools. The falls and surrounding exposures illustrate the local Cretaceous limestone bedrock and surface karst-influenced drainage patterns characteristic of the Balcones Fault region. The site has documented stream morphology changes from floods that periodically reshape the limestone steps. The park lies within Austin and is managed by the Texas Parks and Wildlife Department.