California Delta Egeria Densa Treatment | Aug 7 to 11


Submersed Aquatic Vegetation Control Program


Department of Parks and Recreation 
Division of Boating and Waterways
Egeria densa, Curlyleaf  pondweed, Fanwort,
Eurasian watermilfoil, Coontail

Treatment for August 7 thru August 11, 2017

Herbicide treatment of invasive submersed aquatic vegetation began on March 1, 2017, the earliest date the program is permitted to start in various areas of the Sacramento-San Joaquin Delta. For more information see the Public Notices.

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Delta Smelt Resiliency Strategy
As part of the 2017 Delta Smelt Resiliency Strategy action for enhanced aquatic weed control, the California State Parks Division of Boating and Waterways (DBW) is conducting herbicide treatments of submersed aquatic vegetation (SAV) in two Delta locations, Little Hastings Tract and Decker Island. Herbicide treatments of SAV in these sites began during the week of June 5, 2017 and will continue for 16 consecutive weeks. The enhanced weed control study plan involves a multi-agency partnership between the California Department of Water Resources, DBW, UC Davis, and the California Department of Fish and Wildlife. The study aims to understand effects of SAV herbicide treatment on delta smelt habitat, water quality, and the food web. For more information on the Delta Smelt Resiliency Strategy, please visit
Treatment Site Schedule
"Treatment sites and schedules are subject to change based on regulatory requirements, weather conditions, plant growth and movement, waterway traffic, listed fish presence surveys, and other conditions."
  • Applications will be conducted during the hours of 7am to 4pm weekly, Monday thru Friday.  
  • Herbicide applications during the time frame will utilize Fluridone (Sonar) only.
   176 -Decker Island
   241 -Long Island Slough
    272 -Little Hastings Tract