Mountain Lake Update - East Arm Tree Removals August 2013

Remediation of Mountain Lake
August – December 2013

The Presidio Trust has completed the first phase of dredging contaminated sediment from the bottom of Mountain Lake, and will continue to remove the dredged material from the staging area north of the lake through the first week of August. The second phase of dredging and off-haul is scheduled to begin in August. The project schedule has been extended through December to remove additional contaminated sediment from the bottom of the lake and the North Arm, and sediment around the lake’s perimeter for lake enhancement purposes.

December 2013 – Spring 2014

Equipment used for remediation will be removed. The staging area north of the lake and the east shore access route will be restored and planted with a mix of wetland and woodland species including oak, pine, willow and native shrubs.

Wetland Expansion and Tree Removals in East Arm
August – October 2013 Tree and Vegetation Removals

The Mountain Lake Enhancement Plan includes revitalization and wetland expansion of the East Arm of the lake, which has not been ecologically functional due to a history of disturbance and unchecked growth of invasive species. With mitigation funding from the San Francisco International Airport, the Presidio Trust will begin wetland expansion work in August 2013 by removing eucalyptus trees and understory vegetation from the bottom of the East Arm. This will open the area to improved air circulation, sunlight and views, and create rearing habitat for long-absent animal species that will be reintroduced to Mountain Lake. Preparation for the construction work will require equipment mobilization on West Pacific for one or two evenings in mid-August. The section of Park Trail through the golf course will be used as the primary haul route.

Summer 2014 Restoration and Enhancement

The Presidio Trust will remove years of accumulated sediment, and plant native wetland and riparian woodland species to create a larger and better-functioning wetland.

Click here for a detailed construction notice and a map of project work areas and alternative trail routes.Trail and Beach Closures (see map)
To ensure public safety, portions of Mountain Lake trail and Park trail will continue to be intermittently closed on weekdays to accommodate material hauling and other heavy construction activities. Mountain Lake Beach will be closed only when work is occurring in the lake.