The newly restored and daylighted Alder Creek flows through the former McCosker property in Sibley Volcanic Regional Preserve. Photo: EBRPD
Ribbon cutting for largest creek restoration project in East Bay Regional Park District’s history.
At Sibley Volcanic Regional Preserve
By Flora Csontos, Acting Public Information Specialist, Public Affairs, East Bay Regional Park District
Join East Bay Regional Park District on Thursday, May 23, 2024, at 11 A.M. to celebrate the completion of the Alder and Leatherwood Creek Restoration and Public Access Project at Sibley Volcanic Regional Preserve – the largest creek restoration project in the Park District’s history. The Alder and Leatherwood Creek Restoration and Public Access Project removed several culverts and opened up 3,000 linear feet of creek to a more natural run. The event will include a ribbon cutting ceremony to celebrate the restoration project and the reopening of the Eastport Staging Area.
Speakers will include East Bay Regional Park District General Manager Sabrina Landreth, Board President Ward 1 Member Elizabeth Echols and Ward 2 Board Member Dee Rosario.
The Alder and Leatherwood Creek Restoration and Public Access Project, previously referred to as the McCosker Project, provides natural habitat for special status or protected species, including the California red-legged frog, California foothill yellow-legged frog, Alameda whipsnake, San Francisco dusky-footed wood rat, golden eagle, Cooper’s hawk, loggerhead shrike, northern harrier, and white-tailed kite. Water quality and streamflow were also improved by the project, providing new habitat for rainbow trout.
Stabilizing jute protects the creek’s soil while plants begin to grow in December 2022. Photo: EBRPD
The project (Alder Creek Project), which began construction in 2020, daylights, or opens up and restores to natural conditions, approximately 2,900 linear feet (approximately half a mile) of previously culverted, or buried, creek and restores riparian habitat along portions of Alder, Leatherwood, and San Leandro creeks. The 250-acre site is situated within a deep canyon of dense oak woodland at the bottom of a ridgeline of rolling grassland hills.
The restoration also created habitat for the rainbow trout (a native salmonid species) by creating stream corridors, using a step-pool system that incorporates a mix of cascades and resting and pocket pools in steeper areas. This newly created stream channel with riparian vegetation and pool riffle complexes, allows sediment transport, slows flows and helps reduce erosion to provide benefits to aquatic organisms and provide spawning sites for rainbow trout. In fact, a young-of-year (juvenile) rainbow trout was observed in the channel in spring 2021. Engineers designed the restoration project using fundamental concepts in fluvial geomorphology and engineering principles to meet the goal of creating a dynamically stable and self-maintaining creek channels that require a low level of adaptive management and maintenance practices.
Plants sprout along the newly daylighted creek in January 2023. Photo: EBRPD
The restoration project also increased the carbon sink, flood capacity on site, removed invasive species, enhanced habitat, and added revegetation. In support of inclusive public access, additional enhancement work included new nature trails and future amenity areas.
The restoration area within Sibley Volcanic Regional Preserve is now opened to the public. It includes an 11-car staging area along Pinehurst Road, with trail connections for a loop trail (the McCosker Loop Trail) and trails that follow the creeks on the property.
The project was made possible through $4 million in funding secured by Assemblymember Rebecca Bauer-Kahan in the 2019 state budget. Additional funding came from the Park District’s voter-approved Measure WW and other state and federal grants from the U.S. Environmental Protection Agency, CA Natural Resources Agency, Wildlife Conservation Board, Coastal Conservancy, California State Parks and voter-approved Propositions 1, 84 and 50 allocated by the California Natural Resources Agency.
Source: EBRPD
The Sibley Volcanic Regional Preserve and Eastport Staging Area are located at 920 Pinehurst Road in Orinda.
The East Bay Regional Park District is the largest regional park system in the nation, comprising 73 parks, 55 miles of shoreline, and over 1,330 miles of trails for hiking, biking, horseback riding, and environmental education. The Park District receives an estimated 30 million visits annually throughout Alameda and Contra Costa counties in the San Francisco Bay Area.
Allen D. Payton contributed to this report.
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