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Flood-control agency reports removal of 300 acres of invasive Arundo; partners to follow up with herbicide treatment
Summary
The county’s flood control manager reported removal of about 300 acres (roughly 700 tons) of Arundo from channels with River Partners and a Wildlife Conservation Board grant, and said follow-up herbicide treatment and upstream work are planned to prevent reinfestation.
Madera County’s flood control and water-resources staff told the Board of Supervisors on Tuesday that partner crews have removed about 300 acres of the invasive plant Arundo (reported as 700 tons removed) from local channels, reducing flood risk and water loss.
Stephanie (flood control manager) briefed the board on work performed in partnership with River Partners and a Wildlife Conservation Board grant. She described a two-step method—mechanical removal followed by herbicide treatment—used to clear dense stands, beginning in the Ash Slough with mapping support from drone surveys. Staff said the work reduces channel pinch points and the plant’s heavy water use, and that River Partners will continue monitoring and treating regrowth where the county has easements or legal access.
Board members asked about upstream reinfestation and long-term eradication strategies; staff said mapping and phased upstream work are planned and that follow-up herbicide applications will be used to control new growth. A board member suggested federal coordination with the U.S. Army Corps of Engineers, noting the plant’s prevalence across channels.
What’s next: Staff said River Partners will continue treatment and monitoring and that the county will pursue additional mapping and removal in areas where access and funding allow. The presentation did not include a formal action to approve additional funds during the meeting.
