The Indian River Lagoon-South C-44 Reservoir and Storm Water Treatment Project is a massive 12,000-acre, $339 million water treatment project, which opened in 2021. It was developed to decrease the flow of nutrient-rich water from Lake Okeechobee to the estuary of the St. Lucie River (which caused algae blooms that threatened habitat and recreation). Water is now diverted to a pumping station, where it enters a rectilinear reservoir that covers six square miles. From there the water is filtered through ten square miles of stormwater retention ponds, before finding its way back into the St. Lucie Canal.