Mill Creek Invasive Species Removal 

Applicant: U.S. Forest Service (USFS)


Project Summary: The U.S. Forest Service (USFS) submitted a proposal that involves the eradication of several target invasive plant species from Mill Creek, a major tributary to the Santa Ana River. Located in the upper Santa Ana River Watershed where invasive plants easily propagate downstream through seed and rhizome dispersal, Mill Creek is an important location to conduct a species eradication program. The target invasive plants for this project are Giant Cane (Arundo donax), Tamarisk (Tamarisk ssp.), Tree of Heaven (Ailanthus altissima) and Spanish Broom (Spartium junceum)


  • IERCD started initial invasive plant treatments of Spanish Broom on November 27, 2017 and December 6, 2017.

  • A large area of giant cane was removed and tested in an area adjacent to Hwy 38 with the support of a crew from the Santa Ana Watershed Association on November 29, 2017 and December 4, 2017.

IERCD & SAWA Field Staff Cutting & Treating Arundo

Tamarix Ramosissima, an Invasive Species, Growing in Frosted Mill Creek