Stockton Lake Dredged to Fight Toxic Algae

In Stockton, California, officials are implementing a novel strategy to combat recurring harmful algae blooms at McLeod Lake. For years, the lake has turned a concerning green during summer months, posing risks to aquatic life and public health.

The Port of Stockton, along with the California Department of Water Resources (DWR), is leading an effort to address the issue at its root. This new initiative involves dredging McLeod Lake to remove the overwintering algae seed stock. Previously, surface skimming was considered, but dredging aims for a more fundamental solution.

Environmental managers like Ellen Preece of the DWR highlighted the dangers, noting that algae blooms can deplete oxygen vital for fish and wildlife. Furthermore, these blooms can generate toxins that lead to liver problems in humans and animals, or contaminate shellfish.

This pioneering project is fully funded by a grant from the Army Corps of Engineers. The DWR has been sampling algae in the delta for four years to understand the problem. By collecting sediment and water samples post-dredging, they will assess if the seed stock has decreased and if bloom severity has lessened.

If this dredging method proves effective, the Army Corps of Engineers may adopt it for other waterways across the United States. While the longevity of the dredging's impact is yet unknown, it represents a potentially crucial tool. The team expects to finalize cost and area estimates by September, with project commencement targeted for November.