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The above map is for general location information only and does not imply access. For access information please check on the refuge's web page or contact the refuge directly. Many refuges have specific visitor services and other recreation opportunity maps. All lands and boundaries depicted in the above web map are not survey quality and should not be used for survey or legal purposes. For more information go to https://www.fws.gov/gis/data/CadastralDB/index_cadastral.html.
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This threatened species is native to the riparian forests of the Central Valley. The Sac River NWR is a very important home for it due to the large number of elderberry bushes which they feed on, lay eggs in, and the larvae mature inside of. The adults live for only a few weeks and can emerge between March - June.