The proposed project will remove Arundo donax from private land in five tributary canyons located along north side of San Fernando Valley: Box Canyon, Devil Canyon, Pacoima Canyon, Little Tujunga Canyon, and Big Tujunga Canyon. These canyons drain to the Los Angeles River. The total area affected is approximately 300 acres, with approximately 5 miles of stream corridor. Primary vegetation communities are riparian woodlands dominated by native white alder, sycamore, cottonwood, and willow species.
Arundo invasions eventually destroy riparian habitat by usurping groundwater and sunlight and by increasing flammability of riparian corridors, which together stress or kill existing native trees and prevent establishment of new seedlings. The impenetrable thickets also constrict flood flows on river channels and have no value to wildlife. Riparian habitat is a precious limited resource in the Los Angeles River watershed because most stream courses have been channelized. A regional goal of eradicating Arundo from the watershed must include the highest upstream infestations in all tributary canyons.