Lake Walter E. Long (also known as Decker Lake)[1] is a power plantcoolingreservoir on Decker Creek in Austin, Texas. The reservoir was officially impounded in 1967 and serves to provide water for turbines used in the production of electricity from petroleum-based fuels. The dam and the lake are managed by the City of Austin. Surrounding Lake Walter E. Long is the city of Austin's Lake Walter E. Long Metropolitan Park, a popular recreational destination.