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Flood Control Grant Project - Cottonwood Creek

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Cottonwood Creek: Removal and Revegetation Plan

Removal and Revegetation
The grant allowed for two invasive plant species, Tamarisk (“salt cedar”) and Arundo donax (“giant reed”), to be removed along Cottonwood Creek. Following the removal of the invasive plants, revegetation of native plants (e.g. willows, mule fat, and cottonwoods) occurred. In addition, protocol surveys were completed for three endangered species, which included the Arroyo Toad, Least Bell’s Vireo, and Willow Flycatcher.

Studies and reports were prepared, as well as a plan in order to avoid negative impacts to these endangered species while removal of invasive plants and revegetation of native plants occurred.

Invasive plants are non-native plants that can be devastating to the environment. Invasive plants cause the following to the environment:

  • Chokes riversides and stream channels
  • Interferes with flood control, increasing flood potential
  • Increases fire potential
  • Often out-competes with, or completely suppresses, native vegetation,
  • Reduces habitat for native wildlife disrupting the balance of the ecosystem (food web, nesting, etc.)
  • Often able to access and take up greater amounts of the local water supply than native vegetation

Approximately 55 acres of the invasive Tamarisk plant were removed along Cottonwood Creek. The first removal of the invasive plants began at the end of August 2006 and ended in the beginning of November 2006. In December 2006 native cuttings and seedlings were collected for the revegetation process, and in February 2007 the native plants were planted to bring the area back to its natural state. At the end of June and beginning of July 2007 there was a follow up re-treatment to remove resprouts of invasive plants.

[ Final Report for the Cottonwood Creek Exotic Plant Species Removal and Revegetation Project ]

Tamarisk ("Salt Cedar") among native plantsField of Tamarisk ("Salt Cedar")
Tamarisk ("Salt Cedar") among native plantsField of Tamarisk ("Salt Cedar")
Tamarisk can grow up to 50 feet tallResprouting of treated Tamarisk ("Salt Cedar")
Tamarisk can grow up to 50 feet tallResprouting of treated Tamarisk ("Salt Cedar")
Native Seedlings to be Planted
Native Seedlings to be Planted

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