The Tres Rios Environmental Restoration Project evolved from an early proposal for advanced nitrogen removal of effluent discharged from the 91st Avenue WTP in Phoenix into a large-scale habitat restoration, environmental education, flood control and public recreation project. Construction included moving 1.6 million cubic yards of earth to create three large wetland areas and two deep-water retention basins. The project also included the installation of 18,000 linear feet of underground water lines and 600 linear feet of 84-inch fiberglass effluent lines. In addition to self-performed activities, the project team managed and coordinated the installation of more than 300,000 aquatic and terrestrial plants to create the wetlands habitat.