Austin Watershed Actively Combating Harmful Algae Growth

Austin Watershed is preparing for a second round of treatment aimed at reducing harmful algae in Lady Bird Lake. Scheduled for Monday and Tuesday, the treatment will involve the application of clay material in two specific areas: Red Bud Isle and east of I-35. Known as lanthanum-modified bentonite, this material effectively reduces the amount of phosphorus, which serves as a vital food source for harmful algae.

Following the initial application in early June, the city has observed a decrease in algae levels within these two areas. However, it is important to note that some algae still remains, necessitating continued caution from residents. Accordingly, individuals are advised to practice due diligence by rinsing themselves and their pets if they come into contact with the water.

Brent Bellinger, the conservation program supervisor with the Watershed Protection Department, clarified that the objective is not to target the algae directly but rather to address the crucial nutrient responsible for its growth, namely phosphorus. He emphasized that harmful algae require ample amounts of phosphorus to flourish and generate toxins.

Since 2019, Lady Bird Lake has experienced harmful algae blooms on an annual basis, which have led to sickness and fatalities among several dogs. Consequently, the current treatment forms part of a five-year pilot program designed to lower phosphorus levels and address this persistent issue.

Previous attempts at reducing phosphorus levels have yielded mixed results. While there has been a decrease at Red Bud Isle, the eastern side of I-35 has not exhibited similar progress. Nevertheless, some individuals have reported a gradual improvement over the past few months. Dylan Roesch, a visitor at the lake, expressed his relief that his dog does not venture into the water, allowing him to still enjoy the area despite the concerns.

During the treatment process, it is advised to maintain a safe distance from the lake. The barge responsible for the application will release a gray material into the water, resulting in temporary cloudiness. Austin Watershed reassures the public that the treatment poses no harm to humans, the environment, or wildlife, emphasizing the safety of the procedure.

As Austin Watershed prepares for the second round of treatment, residents and visitors are encouraged to remain vigilant and follow the necessary precautions, underscoring the dedication of local authorities in combating harmful algae and ensuring the well-being of the community and its surrounding ecosystem.