Northern San Joaquin Valley WMA


Region covered: San Joaquin, Stanislaus & Merced Counties

Co-Chairs: Diana Waller, USDA-NRCS and
Jarrod Martin, East Stanislaus Resource Conservation District

General contact: Diana Waller, (209) 491-9320 x132, and
Jarrod Martin, (209) 491-9320 x100,

Meetings: Quarterly at the Stanislaus County Agriculture Department,
3800 Cornucopia Way, Suite B, Modesto, CA (209) 525-4730

Formed: 1999

Outreach Summary:


  • Yellow Star Thistle brochure


  • San Luis Wildlife Refuge bus tours and classroom visits for local school children
  • Restoration events, demonstrating multiple control options
  • Weed mapping demonstrations
  • Invasive weed education for the general public & school children at events hosted by State Parks, e.g. annual Earth Day Event

Project Highlights:

  Invasive plant control along Stanislaus River & San Joaquin River

  • Several varieties of weeds can be found along a ten mile stretch of the lower Stanislaus River from the City of Ripon to its confluence with the San Joaquin River. Several species are being controlled in this area tree including tree of heaven, arundo, edible Fig, himalayan blackberry, perennial pepperweed and yellow starthistle. Chemical control is used to reduce the weed populations.
    Goals are to protect mature and newly restored riparian habitat for multiple endangered and threatened species.
    Project partners: California State Parks, United States Fish & Wildlife Service, United States Army Corps of Engineers and private land owners.

  Turlock Lake State Recreation Area Campground Project

  • In the Turlock Lake State Recreation Area Campground, large populations if himalayan blackberry and edible fig can be found. These weeds over populate riparian areas, roadsides, and disturbed areas. They crowd out native vegetation and endanger wildlife habitat. The himalayan blackberry is removed manually and edible fig is treated with chemicals for eradication. Strategic goals are to protect the Central Valley riparian community. The main project partner for this endeavor is California State Parks.

Organizations on WMA’s MOU

  • Army Corp of Engineers
  • Stanislaus River Parks
    California Department of Boating & Waterways
  • California State Parks, Four Rivers District
  • City of Modesto Parks
  • City of Turlock
  • Del Rio Country Club
  • East Stanislaus Resource Conservation District
  • Grassland Water District
  • Hooker Grain Company
  • Master Lawn Care
  • Merced County Agriculture Department
  • Merced Irrigation District
  • Modesto Irrigation District
  • Naglee Burk Irrigation District
  • Nitro-Green Lawn & Tree Care
  • Reclamation District #1007
  • San Joaquin County Agriculture Department
  • San Joaquin County Mosquito Abatement District
  • San Joaquin Farm Bureau Federation
  • Stanislaus County Agriculture Department
  • Stanislaus County Public Works
  • Stockton East Water District
  • Turlock Irrigation District
  • University of California Cooperative Extension, San Joaquin County
  • United States Fish & Wildlife Service
  • San Luis National Wildlife Refuge Complex
  • United States Deaprtment of Agriculture, Natural Resource Conservation Service, Merced
  • United States Deaprtment of Agriculture, Natural Resource Conservation Service, Modesto
  • United States Deaprtment of Agriculture, Natural Resource Conservation Service, Stockton
  • West Stanislaus Resource Conservation District
  • Wilbur-Ellis Company

Other regular participants

  • East Bay Municipal Utility District
  • Faith Ranch