Workers began removing up to 175 non-native trees from the Marin Headlands this morning to enhance the habitat of the endangered mission blue butterfly.
The trees are being removed through Friday from Slacker Ridge and Hawk Hill just west of the Golden Gate Bridge.
The Hawk Hill site will be replanted with native coastal grassland and prairie sagebrush that include silver lupine, the primary host plant for the mission blue butterfly.
The tree removal also will help restore the view from the popular vantage point and protect the historic gun batteries from root intrusion damage.
The tree removal is part of the U.S. Fish and Wildlife Service's mitigation requirements to enhance the butterfly's habitat.
Helicopters will remove the trees on Thursday and Friday starting at 8 a.m. The trees will be taken to a nearby rifle range on Bunker Road, where they will be chipped up and hauled out by truck, according to Golden Gate National Recreation Area officials.
Lower Conzelman Road west of Battery Spencer may experience minor traffic delays Monday through Wednesday. It will be closed to auto, bike and foot traffic on Thursday and Friday between 8 a.m. and 6 p.m.
The Coastal Trail and McCullough Road also will be closed during this time and traffic will be diverted through the Baker-Barry Tunnel.
Upper Conzelman Road from McCullough west will be closed to auto and bike traffic Monday through Friday.<
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