Los Angeles County Department of Regional Planning


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Created On:
May 19, 2011
Last Updated:
Nov 22, 2011
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Tujunga Canyon / Hansen Dam SEA

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Biological resource data is available on each proposed SEA map, by clicking on the layers icon, expanding Main Map and viewing the Overlays. Map Download Instructions

The Tujunga Canyon/Hansen Dam area possesses several important features. The floodplain behind the dam supports one of the last examples of open coastal sage scrub vegetation that was once found in the numerous arroyos of the Los Angeles basin. Portions of the river bottom have surface moisture, and support small pockets of fresh water marsh, another limited resource in Los Angeles County. The remainder of the arroyo and surrounding hillsides are dry, and support several species of plants that are otherwise found only on the desert slopes of the San Gabriel Mountains. Populations of Nevin’s barberry (Berberis nevinii) and slender-horned spineflower (Dodecahema (Chorizanthe) leptoceras) have been found in the wash. Both species are extremely limited in distribution and have been placed on the federal rare and endangered species list…

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